STUDER NEXT3 Smart Hybrid Inverter Charger With Advanced Interface User Guide

The Studer Innotec SA next3 charger is a high-quality system
designed for efficient operation. It comes with important safety
instructions to ensure safe usage and optimal performance. The
system is capable of handling high-voltage DC and AC, providing
reliable power management for various applications.

General Information:

Important Safety Instructions:

Do not exceed the maximum rated characteristics of the
equipment.

High-voltage DC and AC inside the device pose a danger of
death.
Disconnect all power sources before working on the electrical
installation.

Wait at least 120 seconds after disconnection for electronics
to discharge.
Check all terminals voltage with a multimeter before opening
the connections compartment.

Quality and Warranty:

The product is backed by Studer Innotec SA’s quality standards
and warranty. Any modifications or repairs should be done with
original parts and authorized by the company to maintain product
integrity.

Product Usage Instructions:

Read the manual carefully for proper system startup and
operation.

Installation should be done by qualified personnel familiar
with local standards.
Ensure all power sources are disconnected before any
maintenance or modifications.

Follow altitude restrictions and contact Studer Innotec SA for
installations above 3000m.

FAQ:

Q: Can the next3 charger be used at high altitudes?

A: The next3 can be installed at altitudes up to 3000m. For
installations at higher altitudes, please contact Studer Innotec SA
for guidance.

Q: What should I do if I need to make modifications to the
system?

A: Any changes, modifications, or repairs to the equipment
should only be done with the prior written authorization of Studer
Innotec. Always use original parts for authorized modifications or
replacements to maintain product safety and performance.

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Accessories: Remote control and communication…. Battery temperature sensor……………….. Cables for communication………………
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Contents
1 INTRODUCTION …………………………………………………………………………………………………………………….. 5 2 GENERAL INFORMATION……………………………………………………………………………………………………….. 6
Important safety instructions………………………………………………………………………………………………………. 6 Quality and warranty…………………………………………………………………………………………………………………. 7
2.1.1 Exclusion of warranty………………………………………………………………………………………………….. 7 2.1.2 Exclusion of liability …………………………………………………………………………………………………….. 7 Conventions………………………………………………………………………………………………………………………………. 8 2.1.3 Glossary……………………………………………………………………………………………………………………… 8 2.1.4 Symbols and conventions…………………………………………………………………………………………… 8 About this user manual………………………………………………………………………………………………………………. 9 3 ESSENTIALS TO KNOW ABOUT A NEXT3 SYSTEM …………………………………………………………………….. 10 Understand the General Energy Strategy…………………………………………………………………………………. 11 Standard use cases …………………………………………………………………………………………………………………. 14 4 HANDLING AND MOUNTING ……………………………………………………………………………………………….. 16 Handling and moving………………………………………………………………………………………………………………. 16 Storage ……………………………………………………………………………………………………………………………………. 16 Dimensions ………………………………………………………………………………………………………………………………. 16 4.1.1 Dimensions of wall mounted next3 …………………………………………………………………………… 16 4.1.2 Dimensions of the 19” rack next3……………………………………………………………………………… 17 4.1.3 Dimensions of the nx-interface …………………………………………………………………………………. 18 Unpacking and mounting………………………………………………………………………………………………………… 19 4.1.4 Mounting place: environmental factors……………………………………………………………………. 19 4.1.5 Unpacking and mounting process of the wall mounted next3 ………………………………….. 21 4.1.6 Unpacking and mounting process of the rack next3 ………………………………………………… 27 5 WIRING ………………………………………………………………………………………………………………………………. 30 General overview ……………………………………………………………………………………………………………………. 30 5.1.1 System block diagram ……………………………………………………………………………………………… 30 5.1.2 General recommendations ……………………………………………………………………………………… 32 5.1.3 Connections overview ……………………………………………………………………………………………… 33 5.1.4 Tightening torques ……………………………………………………………………………………………………. 36 5.1.5 Max permissible cable cross-sections summary ………………………………………………………… 36 Connecting the battery …………………………………………………………………………………………………………… 37 5.1.6 Dimensioning the battery …………………………………………………………………………………………. 38 5.1.7 Battery cable cross-section, DC protective and disconnection devices …………………… 39 5.1.8 Connecting the battery……………………………………………………………………………………………. 39 5.1.9 Earthing of battery……………………………………………………………………………………………………. 41 5.1.10 Precautions when using batteries……………………………………………………………………………… 41 5.1.11 Battery temperature sensor connection (nx-tempSensor) …………………………………………. 42 5.1.12 Battery with communicating BMS: CAN connection…………………………………………………. 43 Connecting the AC (Alternative Current) ………………………………………………………………………………… 46 5.1.13 Sizing of AC protective devices ………………………………………………………………………………… 47 5.1.14 AC Neutral and Earthing system……………………………………………………………………………….. 49 5.1.15 Commissioning …………………………………………………………………………………………………………. 54 Connecting the Photovoltaic generator ………………………………………………………………………………….. 55 5.1.16 PV string dimensioning ……………………………………………………………………………………………… 55 5.1.17 Connection ……………………………………………………………………………………………………………… 58 5.1.18 Earthing of PV…………………………………………………………………………………………………………… 59 5.1.19 Cables and cross-section …………………………………………………………………………………………. 60 5.1.20 Protection devices……………………………………………………………………………………………………. 61 Lightning protection ………………………………………………………………………………………………………………… 62 Connecting the Studer communications cables ……………………………………………………………………… 63 5.1.21 Connection of the nx-interface ………………………………………………………………………………… 64 5.1.22 Connection to Internet …………………………………………………………………………………………….. 65 Wiring auxiliary I/O …………………………………………………………………………………………………………………… 66 5.1.23 Auxiliary contacts …………………………………………………………………………………………………….. 66 5.1.24 Command Inputs……………………………………………………………………………………………………… 67 5.1.25 DRM function and command input 1 (AU-NZ version) ………………………………………………. 68

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5.1.26 RS485i……………………………………………………………………………………………………………………….. 69 Multi-unit configurations …………………………………………………………………………………………………………… 70
5.1.27 AC in multi-units ……………………………………………………………………………………………………….. 71 5.1.28 Battery in multi-units………………………………………………………………………………………………….. 72 5.1.29 Extension of an existing installation……………………………………………………………………………. 73 6 POWER-UP OF THE EQUIPMENT …………………………………………………………………………………………….. 74 Initial configuration ………………………………………………………………………………………………………………….. 74 Front panel Button …………………………………………………………………………………………………………………… 74 Front panel LED indicator …………………………………………………………………………………………………………. 75 Beep indicator (Buzzer) ……………………………………………………………………………………………………………. 77 Behavior in problematic conditions ………………………………………………………………………………………….. 78 6.1.1 Thermal behaviour……………………………………………………………………………………………………. 78 6.1.2 Overload………………………………………………………………………………………………………………….. 78 7 HMI: USE OF NX-INTERFACE…………………………………………………………………………………………………. 79 General navigation and use ……………………………………………………………………………………………………. 80 7.1.1 Screens map ……………………………………………………………………………………………………………. 81 7.1.2 Embedded documentation……………………………………………………………………………………… 84 7.1.3 Accessibility ……………………………………………………………………………………………………………… 85 Displaying the state of the energy system on the NX-interface…………………………………………………. 87 7.1.4 Simple dashboard ……………………………………………………………………………………………………. 87 7.1.5 Synoptic …………………………………………………………………………………………………………………… 88 7.1.6 Simple chart …………………………………………………………………………………………………………….. 89 7.1.7 Messages …………………………………………………………………………………………………………………. 90 The nx-interface functionalities ………………………………………………………………………………………………… 91 7.1.8 Remote Control ……………………………………………………………………………………………………….. 91 7.1.9 Update …………………………………………………………………………………………………………………….. 93 7.1.10 Installation Configuration………………………………………………………………………………………….. 96 7.1.11 Monitoring & dataloging ………………………………………………………………………………………….. 98 8 CONFIGURATION AND OPERATION OF THE NEXT3 ENERGY SYSTEM …………………………………….. 105 Configuration…………………………………………………………………………………………………………………………. 105 8.1.1 Configuration Wizard ……………………………………………………………………………………………… 105 AC-Source……………………………………………………………………………………………………………………………… 116 8.1.2 General information ……………………………………………………………………………………………….. 116 8.1.3 AC-source Information……………………………………………………………………………………………. 116 8.1.4 AC-source Settings for Grid …………………………………………………………………………………….. 119 8.1.5 AC-source Settings for Genset ………………………………………………………………………………… 123 Solar PV………………………………………………………………………………………………………………………………….. 124 8.1.6 General information ……………………………………………………………………………………………….. 124 8.1.7 Solar Information…………………………………………………………………………………………………….. 124 8.1.8 Solar Settings ………………………………………………………………………………………………………….. 126 Battery 128 8.1.9 General information ……………………………………………………………………………………………….. 128 8.1.10 Battery Information …………………………………………………………………………………………………. 128 8.1.11 Thermal behaviour………………………………………………………………………………………………….. 128 8.1.12 Overload………………………………………………………………………………………………………………… 129 8.1.13 Battery Settings ………………………………………………………………………………………………………. 131 8.1.14 Battery: additional explanations……………………………………………………………………………… 133 AC-Loads ………………………………………………………………………………………………………………………………. 144 8.1.15 General information ……………………………………………………………………………………………….. 144 8.1.16 AC-Loads Information …………………………………………………………………………………………….. 144 8.1.17 AC-Loads settings …………………………………………………………………………………………………… 145 AC-Flex ………………………………………………………………………………………………………………………………….. 147 8.1.18 General information ……………………………………………………………………………………………….. 147 8.1.19 AC-Flex as source; information and settings ……………………………………………………………. 147 8.1.20 AC-Flex as Loads; information…………………………………………………………………………………. 148 8.1.21 AC-Flex as load; Settings…………………………………………………………………………………………. 149 Device and I/O: Aux contacts, Inputs and communication……………………………………………………. 155 8.1.22 General points ……………………………………………………………………………………………………….. 155 8.1.23 Device Information …………………………………………………………………………………………………. 156

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8.1.24 AUX-contacts settings …………………………………………………………………………………………….. 156 8.1.25 IN-CMD settings………………………………………………………………………………………………………. 157 8.1.26 RS485i Settings ………………………………………………………………………………………………………… 158 System settings……………………………………………………………………………………………………………………….. 159 8.1.27 Neutral and earthing relay ……………………………………………………………………………………… 159 8.1.28 Source priority ………………………………………………………………………………………………………… 161 9 SPECIAL APPLICATIONS …………………………………………………………………………………………………….. 162 AC-coupling ………………………………………………………………………………………………………………………….. 162 9.1.1 General system design……………………………………………………………………………………………. 162 9.1.2 AC-coupling with frequency shift ……………………………………………………………………………. 163 9.1.3 Simplified AC-coupling (no island mode) with AC-Flex ……………………………………………. 167 9.1.4 Example of use……………………………………………………………………………………………………….. 171 External Bypass for redundancy……………………………………………………………………………………………… 172 9.1.5 Simple manual bypass ……………………………………………………………………………………………. 173 9.1.6 Automatic bypass ………………………………………………………………………………………………….. 174 External control of the next3 by SCADA …………………………………………………………………………………. 175 9.1.7 Example of control of next3 in function of an external smartmeter …………………………. 177 10 MAINTENANCE OF THE INSTALLATION ………………………………………………………………………………… 178 11 TECHNICAL DATA ……………………………………………………………………………………………………………… 179 Deratings with temperature……………………………………………………………………………………………………. 181 Autralian labelling ………………………………………………………………………………………………………………….. 183 Security categories ………………………………………………………………………………………………………………… 183 12 PRODUCT RECYCLING……………………………………………………………………………………………………….. 184 13 CONFORMITY ……………………………………………………………………………………………………………………. 184 Grid code conformity …………………………………………………………………………………………………………….. 184

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1 INTRODUCTION
Congratulations! You are about to install and use equipment from the Studer NEXT range. You have chosen a high-tech converter that will play a central role in the energy production of your solar electrical installation. The next3 has been designed to work as a solar battery charger and hybrid inverter working in both modes “off-grid” and “on-grid”. Its advanced and completely configurable functionalities will guarantee the perfect functioning of your energy system in any situations. The NEXT range is a family of hybrid inverters, with or without included solar chargers. All models are designed with Swiss quality to have outstanding performances in offgrid and ongrid applications. When the next3 is connected to batteries and photovoltaic panels, it automatically recharges batteries with all the available solar power. According to the selected programming, the solar can be injected to the grid or used for self-consumption only. The accuracy of the Maximum Power Point Tracking (MPPT) algorithm, the high output and low internal consumption ensure an optimal valorization of the energy produced by the PV modules. The battery charge profile may be set freely according to the battery type or the operation mode. The charging voltage is corrected depending on the temperature thanks to the external sensor nxtempSensor. If using lithium batteries, the next3 communicates with battery BMS through a CAN-bus and ensure an optimal operation according to the manufacturer of the battery. The control, display and programming unit nx-interface allows an optimal setup of the system and guarantees the user permanent control over all important parameters for the installation. Moreover, it enables the recording of the system data to analyze later its functioning (data logging). The nxinterface is also the communication gateway to connect the energy system to the remote monitoring web portal https://portal.studer-innotec.com for distant supervision. The remote supervision can also be done with the APP Studer Easy Monitoring, available for both IOs and Android. The next3 operates as an independent device and is also designed to be included into a Studer energy system together with other NEXT compatible devices, display modules and the communication modules. The parallel operation of several inverters is possible and offers modularity and flexibility enabling an optimum dimensioning of your system according to your energy requirements. Working together, these different devices have a synchronised behaviour for a better management of the battery and of the solar resource. The next3 is available in models without the solar charger or without the ACtransfer to fit in various types of systems.

Please read this manual carefully to ensure the perfect start up and operation of your system. It contains all the necessary information regarding the operation of the next3 charger. The installation of such a system requires special expertise and may only be carried out by qualified personnel familiar with the local standards in force.

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2 GENERAL INFORMATION
IMPORTANT SAFETY INSTRUCTIONS
This manual contains important safety instructions. Please carefully read the safety and operation instructions before using a next3 device. Take into consideration all the warnings mentioned both on the equipment and in this manual, following all the instructions regarding the operation and use. The installation and commissioning of the next3 must be entrusted to qualified personnel. The installation and use must comply with the local safety instructions, laws, and standards in force in the country.
Do not excess the maximum rated characteristics of the equipment shown on the Type label and in the datasheet.
HIGH-VOLTAGE DC AND AC INSIDE THE DEVICE: DANGER OF DEATH
When the next3 is under operation, it generates voltages that can be potentially lethal (up to 900Vdc and 400Vac). Any work on or close to the installation must be carried out only by thoroughly trained and qualified personnel. Do not try to carry out ordinary maintenance on this product yourself. The next3 is in overvoltage category III (OVC III) on AC side, in accordance with the safety standard IEC/EN 62109-1. It is in overvoltage category II (OVC II) for the PV connection and in overvoltage category I (OVC I) for the battery connection.
While working on the electrical installation, it is important to make sure that the source of DC voltage coming from the battery as well as the source of DC voltage coming from the photovoltaic generator, have been disconnected from the electrical installation. Be also certain the sources of AC voltage coming from a generator or network have been disconnected from the electrical installation.
Even when the next3 is disconnected from the power sources, a potentially dangerous voltage may remain at the terminals. To eliminate this, you must wait for at least 120 seconds to allow the electronics to discharge.
After disconnection, check all the terminals voltage with a multimeter in AC and DC modes. The connections compartment can then be opened, and the task carried out safely. All other cover parts of the device shall never be opened without written authorization of Studer Innotec SA company.
The next3 can be installed at altitudes up to 3000m. For installations at higher altitudes, please contact Studer Innotec SA.
If the next3 is used in a manner not specified in this manual, the protection provided by the next3 may be impaired.
Nobody is authorized to proceed with any change, modification, or repair of the equipment without the prior written authorization of Studer Innotec. Use only original parts for any authorized modification or replacement.

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QUALITY AND WARRANTY
During the production and assembly of the next3, each unit undergoes several checks and tests which strictly comply with established procedures and device safety requirements. The manufacturing, assembling, and testing of each next3 are entirely carried out in our factory in Sion (CH). The warranty for this equipment depends upon the strict application of the instructions in this manual. You can download the current warranty conditions from the Internet at www.studer-innotec.com.
2.1.1 Exclusion of warranty
No warranty claims will be accepted for damages resulting from handling, use or treatment that are not explicitly mentioned in this manual. Damages arising from the following causes are excluded from the warranty:
· Voltage higher than 900V across PV terminals. · Voltage higher than 70V across battery terminals. · Use of the device outside of the specification of the product. · Accidental presence of liquids in the equipment or oxidation due to condensation. · Damage resulting from falls or mechanical shocks. · Modifications carried out without the explicit authorization of Studer Innotec. · Nuts or screws that have been too much or not enough tightened during the installation or
maintenance. · Damage due to atmospheric surge voltage (lightning). · Damage due to inappropriate transportation or packaging. · Damages due to improper installation · Disappearance of original identification marks.
Never take off or damage the rating plate showing the serial number. It enables to check and follow-up the data specific to each equipment and is vital for any warranty claim.
2.1.2 Exclusion of liability
The installation, commissioning, use, maintenance, and servicing of the next3 cannot be subject of monitoring by Studer Innotec. Therefore, we disclaim all responsibility and liability for damage, costs or losses resulting from an installation that does not comply with the instructions, faulty operation or inadequate maintenance. The use of Studer Innotec equipment is in any case under the responsibility of the customer. This equipment is neither designed nor guaranteed to supply installations used for vital medical care nor any other critical installation entailing potential risks of important damage to people or to the environment. We assume no responsibility for the infringement of patent rights or other third parties’ rights resulting from the use of the inverter. Studer Innotec reserves the right to make any modifications to the product without prior notification. Studer Innotec is not liable for incidental, direct or indirect damages of any kind, including any profit loss, revenue loss or damage caused to equipment or goods due to defective equipment.
The next3 is certified for various grid codes. The installer is responsible for setting the proper grid code at commissioning according to the local regulation. Studer Innotec SA doesn’t assume any responsibility for modification of grid code or individual settings concerning that subject. Those settings are protected by a user code that is not public (Expert mode).

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CONVENTIONS
2.1.3 Glossary
AC: Alternative Current AC-Load: The AC-Load is a physical connection for the electrical loads. It is separated from the grid in case of grid failure and backed up by the inverter. The connection is 3 phases and neutral. Single phase load can be connected. AC-Flex: The AC-Flex is a physical connection for 3 phases and neutral. It can be configured for a use as a secondary AC source, or for a use as a controlled secondary AC load. AC-Transfer: with “transfer” we mean the fact that the AC-Source is connected to the AC-Loads with the internal relays of the next3. The input voltage is “transferred” to the output. PE: Protective Earth Solid neutral: when the AC-Source and the AC-Loads neutral are physically connected with a bridging cable. Transfer: have a transfer means be connected to the AC-source with the internal relay. The inverter switch to a current source mode. Multi-unit system: a system with several next3 units running in parallel and synchronized with the communication cable.
2.1.4 Symbols and conventions
This symbol is used to indicate safety instructions, which, if not followed, could result in a risk of electrical shock with possible serious personal injury or death to the operator or the user.
This symbol is used to indicate a risk of material damage and/or the cancellation of the guarantee.
This symbol is used to indicate a procedure or function that is important for a safe and correct use of the equipment. Failure to respect these instructions may lead to the cancellation of the guarantee or to a non-compliant installation.
This symbol placed on the product indicates that its surfaces may reach temperatures higher than 60°C.
This symbol placed on the product indicates that its use must follow the instructions in the user manual.
PE= protective earth (connected to the enclosure of the device).
For information specific to the Australian model of the nx3 to be compliant with the standards AS/NZS 4777.2. This is used for the New Zealand as well.

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ABOUT THIS USER MANUAL

Studer Innotec SA next3

This manual contains all the necessary information and procedures to install, configure, use and troubleshoot the next3 hybrid inverters. It is the most detailed documentation about this product. An online user manual and applications notes are available at: https://technext3.studer-innotec.com

A summary is provided in the Quick Installation Guide, delivered with the product in a printed version.

Type of documents
Brochure

Simple/commercial

Quick Installation Guide
Online user manual /Application notes / Wiring examples
Technical Manual nx3 / nx1 / nxOS

Detailed /technical

This manual does not contain information about photovoltaic modules (PV) or batteries of various brands that can be connected. For this kind of information, please refer to the instructions of each specific manufacturer.

It does not contain specific information on national rules/regulations about electrical installation. It contains only safety requirements about the use of the device next3 according to following International and European standards; IEC/EN 62109 for power converters used in photovoltaic systems and IEC/EN 62477 for power converters used in general systems.

This manual covers the next3 following models and accessories:

· Hybrid inverter charger

(with any options) with software version to 1.3.0.0

· Interface:

with software version up to 1.3.0.0

· Battery temperature sensor:

This manual is an integral part of the equipment and must be kept available for the operator and/or the installer. It is provided under digital form in the usb key delivered with every unit. The latest version of the manuals can be downloaded on Studer website: https://www.studer-innotec.com

The content of this manual is copyrighted by Studer-Innotec SA, Rue des Casernes 57, 1950 Sion, Switzerland

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3 ESSENTIALS TO KNOW ABOUT A NEXT3 SYSTEM
The next3 is a hybrid inverter charger, that can work in a stand-alone (offgrid) mode or connected to an external AC source, being a grid or a generator.

A few concepts must be understood to use and configure the next3 systems properly: · The next3 has a connection named “AC-Source” where comes the main AC source: the grid or a generator. o This input has a high security level, with doubled security relays for disconnection according to new international grid code and safety standards (for example: IEC 62109, VDE-AR-N 4105, EN 50549-1, …). In case of connection to a distribution grid, always connect the grid to AC-Source. o The choice to use AC-source to connect to the grid or to a genset is done during the first configuration of the system. It cannot be change `live’, while the system is working, and would need a complete reset of the system if you want to change it. The behaviour of the next3 is different with a grid or with a genset. o The grid code choice must be set properly by the qualified installer during commissioning according to the local requirements of the DSO (Distribution System Operator). This is done during the wizard process. It can only be changed with a complete reset of the system and restart of the wizard process. The access code “Expert” that enable access to the wizard after the first commissioning is not public for this reason. o AC-source works with three-phased grid only if a grid code is selected because (all) grid codes ask to have the proper 3 phases for 3-phased systems. Operation on a single phase is not allowed. Operation on a single phase is possible if a genset is selected as source during the wizard. o There is only one connection to one AC-source in a system even in a multi-unit system when there are physically multiple connections. Transfers are never used in parallel and only one transfer switch will be operated. That means the max transfer current is 80A even with 3 next3 in parallel. The identification of which AC input is used in multi-system is done during the wizard configuration process. o The next3 is an “offline UPS”, that means the AC main is supplied directly to the load with the internal transfer switch (no double conversion). This implicate that the voltage and frequency of the grid is the same on the loads side.
The maximal current/power taken from the AC-Source can be controlled in order to cope with limited connection (per example max amps of the grid connection). The next3 can compensate with battery power with the Smart-Boost function.
· On the other side, it has a connection named “AC-Loads” where the load/consumption is connected, that are supplied by the batteries/solar when there is no grid or genset. o There is only one AC-load in a system: in multi-units all the AC-loads output must be electrically connected. All next3 work together to create a single voltage (distribution panel).

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· The choice to operate “AC-FLEX” as a connection for a genset as source or for controllable loads is done at first configuration and cannot be changed (like for the AC Source).
o Similar to the AC-source, there can only be one AC-Flex as source used in a system.
o In case it is used as source, the priority can be chosen with a system setting: first one valid that comes in, AC-source or AC-flex.
o In multi-unit systems the AC-flex connections must not be wired in parallel. The programming of the AC-flex as load are independent for each next3 (slide left and right on the screen to access each individually). The programming is done for each phase L1, L2 and L3 independently. That means for a multi-unit system with 3 next3, there can be up to 9 single phase controllable loads used.
UNDERSTAND THE GENERAL ENERGY STRATEGY
The next3 is a renewable energy friendly converter and always try to optimize the solar in the system. The energy management between all the converters and components of the energy system is done by the Power Flow Dispatcher algorithm. This is at the core of the next system.
Studer simplified the use of its product to be transparent to most of the end -user. Four standard energy strategies are available and can be selected during the configuration process in the wizard with only two questions to answer:
· is grid feeding allowed? This question is asked only if you have selected “grid” as connection to AC-source. If you selected “genset”, the grid feeding is forbidden.
· Is battery used for solar self-consumption optimization? That means the battery is used daily as energy buffer. Solar energy recharges the battery and is used during the night.

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In AC: Grid feeding is allowed?

Grid Feeding is allowed

Grid Feeding not allowed (by default if source is a genset)

In Battery: Cycle battery used for solar optimization?

Typical use case:

Solar optimization Keep battery Solar optimization Keep battery

with battery

full for backup with battery

full for backup

Solar

self

consumption

optimization

Full grid feeding with Solar Backup

Solar priority with Zero export

OFFGRID or Weak grids

Default SOC for Backup

20% lithium 50% lead acid

100%

20% lithium 50% lead acid

100%

The 4 cases description, defined by those two questions are: · Use of battery for solar self-consumption optimization until a state of charge (SOC) for BackUp. During the night, the battery is discharged until the given SOC. Under the defined SOC level, a reserve is left in case of blackout. The default level is 20% to use 80% of the battery as buffer for lithium batteries and 50% for lead acid batteries. During the day, when the solar power is produced, that energy is used to supply the AC loads, charge the battery1 and inject the excess energy to the grid. · Full grid feeding: In this situation, the battery is kept full to be ready in case of blackout. The SOC for back-up is 100%. All the solar power produced supply the loads and the excess is injected to the grid. · Solar priority with zero export. The solar power is used to charge the battery and to supply the loads but is never sent back to the AC-source. In that mode the grid-feeding is not allowed. The battery is used as buffer. When there is more solar than loads, the excess will charge the battery. When the loads are higher than the production, the energy is taken first from the battery. Only when it is at the lower threshold (SOC for Backup) the grid will be used. Like that, there is still some energy left in the battery to run some loads when a blackout happens. When the battery is full and the load is small, the MPPTs will reduce the production, causing some solar energy to be lost. · Offgrid or Weak grid: AC-source is a genset or a grid where the injection is forbidden. The battery is charged to the maximum as soon as the AC source is present ensuring to have energy available in the next blackout event.

Note: in expert mode, it is possible to change the value of the “SOC for backup” setting.

1 Battery is loaded up to the SOC for grid feeding level. SOC for grid feeding is 100% by default but it can be modified in advanced mode.

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ABOVE: Only solar excess will be used to recharge the battery. That storage will be used to supply the load

SOC for Backup

UNDER: The grid is used to recharge the battery to this level to guarantee a minimal energy backup

All the settings about this general behaviour are set during the “Wizard settings” process. For details about individual settings see the AC-SOURCE section and Battery section of this manual.

Comments about the State Of Charge (SOC) for backup If the SOC for backup is set to 100%, the battery will be fully charged with the AC-source (when available) with a target voltage following the cycle (for lead acid: absorption, floating, …) or with the voltage given by the BMS.
If the next3 is in Smart-Boost due to a max current limit on the AC-source, the battery can be discharged below the SOC for backup and down to the SOC for end of discharge.
If the SOC for backup is lower than 100% the charging may stop before reaching the target voltage of the cycle. Voltage limits of the battery cycles are always used as boundaries in any case. SOC for backup is modified in the battery configuration menu and is available to basic user. It is possible to change it at any time.

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STANDARD USE CASES
Illustrations are provided below for the 4 basic use cases of the next3.

Grid connected installation with grid feeding allowed and use of battery for self-consumption optimization:

Typical answers in the Wizard:

· Grid: YES with grid

feeding

· Genset: NO

· Cycle battery: Yes

Default behaviour:

· Optimisation

with

battery use between

100% (SOC for grid

feeding) and 30% (SOC

for backup)

· If the grid is connected,

the battery is charged

only up to 30% with grid

energy. Above that

level, only the solar is used to fill the battery.

· Solar is used for the loads during the day as soon as SOC is above 30%.

· When the battery is full, excess is fed to the grid

Grid connected installation with full grid feeding; the battery is not cycled (kept for backup only):
Answers in the Wizard: · Grid: YES with grid feeding · Genset: NO · Cycle battery: NO
Default behaviour: · If the grid is connected, the battery is fully charged to 100% to be ready for a blackout. · Solar is used for the loads during the day and excess is fed to the grid. · Next3 is like a gridinverter when the grid is always on.
This is the configuration of UPS or backup use, with or without solar.

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Solar priority without grid feeding: zero export solar backup
Answers in the Wizard: · Grid: YES without grid feeding · Genset: NO · Cycle battery: NO
Default behaviour: · Energy is never sent back to the grid. · Solar is used for the loads during the day and to fill the battery, and excess is lost

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OFFGRID installation (back feeding on genset is forbidden!):
Answers in the Wizard:
· Grid: NO · Genset: YES, on AC-
source · Cycle battery: NO
Default behaviour: · Energy is never sent back to the genset. · As soon as the genset is ON, the batteries are charged. · Solar is used in priority for the loads during the day
During operation, all the limits and constraints are automatically managed by the NX3. Power production and storage is optimally dispatched in the system due to the OPFD technology (Optimal Power Flow Dispatcher).

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4 HANDLING AND MOUNTING
HANDLING AND MOVING
The weight of the next3 with the package is about 60kg. Use an appropriate lifting method as well as help from a third party when installing the equipment.
STORAGE
The equipment must be stored in a dry environment at an ambient temperature between -20°C and 60°C. Store it in a location where it is to be used a minimum of 24 hours before commissioning to avoid thermal shocks and condensation problems.
DIMENSIONS
4.1.1 Dimensions of wall mounted next3
The next3 must be installed vertically. Distances of at least 12cm around the units and 25cm above the equipment are required to guarantee adequate ventilation (see mounting section of this manual).

2 removable handles on each side of the device can be screwed to help the lifting of the device and then leave adequate space for them. Never lift the device by handling the plastic cover part! If the next3 is installed in a closed cabinet, it must have sufficient ventilation to guarantee that the ambient temperature is kept within the operating limits of the next3.

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4.1.2 Dimensions of the 19” rack next3

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The rack version of the next3 is for 19″ rack and has the equivalent of 8 units in height.

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4.1.3 Dimensions of the nx-interface
The nx-interface can be fixed on the inverter with dedicated mounting frame or remotely wall mounted. It can also be integrated on a control panel. See the mounting section for details of installation. See the Wiring chapter for cabling of communication.

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UNPACKING AND MOUNTING
When unpacking, check that the next3 has not been damaged during transport and that all accessories listed below are present. Any fault must be immediately reported to the product distributor or the contact mentioned at the back of this manual. Carefully check the packaging as well as the next3. Contents:
· Quick Installation Guide and user interface guide · Next3 inverter-charger · Nx-interface with
o Mounting structure o USB stick with detailed technical manual, to be used for datalogging with the nx-
interface. o Kit for front panel fixing o 1m communication cable · Sunclix connectors for PV cables (4 pairs) · Male connectors for o CAN lithium battery communication o RS485 o 2 pieces for AUX contacts o 1 piece for CMD inputs · Temperature sensor nx-tempSensor (with male connector) · Mounting plate (for wall mounted version) with 1 screw for fixing on the body of the next3. The screws for the wall are not provided. Choose the appropriate screws for your wall. · Fixing belt with 2 screws · 4 handles · Cable-glands for battery and AC (for wall mounted version)

4.1.4 Mounting place: environmental factors
Next3 is designed for indoor use (IP20) and the place of installation must satisfy the following criteria: · Protected from any unauthorised person. · Protected from water and dust and in a place with no condensation. · It must not be situated directly above vented lead acid batteries, or in a cabinet with it, due to corrosive gas. · No easily inflammable material should be placed directly underneath, behind or close to the next3. · Ventilation holes must always remain clear and be at least 20cm from any obstacle that may affect the ventilation of the equipment (see mounting schematics).

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· In mobile applications, it is important to select an installation site that ensures the lowest possible vibration level.
· According to the IEC/EN 62109-1 standard, the level of pollution at the mounting place should not exceed PD2 (second-degree environment), which means that there can be pollution as long as it becomes not electrically conductive and non-flammable.
· Protected from direct solar radiation or heat sources.
As much as possible, reduce exposure to sudden temperature variation: important heat variation may create undesired and harmful condensation inside the equipment.
The next3 is qualified at 25°C ambient temperature.
Thermal behaviour The next3 is rated at 25° ambient temperature with proper ventilation (space around the next3). It has several internal temperature measurements and performs a derating of its functionalities in case of overheating. There is a temperature derating of the power capacity in function of the ambient temperature. The derating starts around 35°C for the solar production as seen below:
· The solar production is reduced from the maximal current of 20A down to 0A to stabilize the temperature to an acceptable level.
· The battery charging and discharging current is reduced to stabilize the temperature. · The inverter max power is limited:
o In island mode, the power is directly given by the loads. If the max current is reached, the voltage drops because the inverter cannot supply the load. When the voltage goes under a voltage threshold of nominal power -10%, the inverter goes to overload.

A message indicates if the performances are limited by temperature.

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4.1.5 Unpacking and mounting process of the wall mounted next3
Unscrew the 8 screws situated on the side of the casing.
Remove top cover. Take the manual, the fixation structure, check the content.

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Remove the external casing

cut the strings maintaining the next 3 to the bottom of the casing. fix the 4 handles on the two sides of the next3 and remove the loops if you don’t need them to move the next3.
Attach the 4 handles

Fixation and lifting eyes Remove them if not needed
Fix the mounting plate on the wall, leaving enough space around the unit for the ventilation and cabling. The next3 must be installed on a non-flammable wall or support. Don’t forget to put the fixing-belt in place before screwing the mounting plate on the wall:

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Those are not provided in the package, select the proper screws for your wall type and ensure a solid mounting. The diameter of the holes in the plate are meant for 8mm screws.
In vehicles (road or marine), or when the support undergoes significant vibrations, the next3 is to be mounted on anti-vibration elements. The fixing belt use is mandatory in those cases.
For the wall mounting plate, use the 5 screws and buffers capable to stand the weight of the inverter in full safety. When drilling the holes, keep at least 542 mm from the top screws to the ceiling to respect the 250mm clearance above the device. Keep at least 290mm to the nearest on the left wall (150mm+454mm/2-90mm=287mm) and 350mm to the next next3 (120mm+454mm/2=347); distance from the middle of the plate. Keep sufficient space below for the cabling.

>290 mm

>550 mm >350 mm

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The next3 is a heavy equipment (~60kg) and must be mounted to a support/structure designed to bear such a load. It is imperative to ensure a complete and safe fastening of the equipment. If simply hung, it may fall down and cause severe damages. For the next steps there must be 2 people at least! Hang the next3 on the structure

Fix the structure at the bottom with the provided screw Fix the belt on the sides with the screws provided

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Fix the nx interface with 2 screws provided. Install the communication cable on the screen before mounting.
fixing screw
The nx-communication cable goes in the plug on the left of the nx interface and is easier to install before the mounting on the nx device. The ethernet cable (LAN) goes on the right. See the wiring sections for details. Special installation on the wall or in a cabinet is shown in the following chapter below.
Open the bottom panel and proceed to wiring.

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AC-Loads
L1-L2-L3-N
AC-Source
L1-L2-L3-N

AC-Flex
L1-L2-L3-N

BAT+

AC PE earth connection

Button battery for clock (RTC)

BAT-

Go to the wiring section of this manual for all explanations about electrical connexions.

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4.1.6 Unpacking and mounting process of the rack next3

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The first steps of the unpacking of the rack version is similar to the wall mounted version. The same packaging is used.

The mounting in cabinet must be performed leaving sufficient space in front and behind the units. If a closed cabinet is used, some extraction fans must be used to evacuation the heat of the power conversion losses.

Go to the wiring section of this manual for all explanations about electrical connections.

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Nx-interface wall mounting
The nx-interface can be hanged on a wall with two screws. The head of the screw goes in the dedicated slot on the back of the nx-interface.

Use suitable screws

and buffers.

The

maximum

diameter

of the screws is 8mm.

Maintain a space of

3mm between the

screw head and the

wall.

nx-interface is supplied with a 1m communication cable to mount on the device.
Cables of different lengths (3m, 10m and 50m) can be ordered. Item reference is: nxethernetCab 3m/10m/50m. The length in meters is specified in reference. You can buy your own ethernet cable for communication; it must be ethernet cat5 with 26AWG. The maximal distance between the inverter and the nx-interface depends then on the rest of the cabling. The total communication cable length in one system for the Studer-nx-bus is 75m.

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Nx-interface panel mounting The nx-interface can be integrated in a panel. The maximum thickness of the panel cannot exceed 4mm.

The opening cut in the front panel must be 122 x 190mm with a maximum radius of 1mm in the corners Mounting Instructions:
Insert the device from the front into the cut-out of the panel and push it carefully until it is fully inserted. Insert the mounting elements (1) into the provided lateral T cut-outs (2) and push them sideways (3) so that they are locked. For the first mounting elements in a corner, tighten the fixing screw (4)until it presses on the plate. Tighten the fastening screws to a maximum torque of 0.2 Nm.
Repeat procedure 3 for opposite mounting elements. Repeat procedure 3 for remaining mounting elements.
Mounting elements and screw are provided Observe the maximum tightening torque of the fastening screws of the mounting elements otherwise they may be damaged. Tighten the fastening screws of the mounting elements to a maximum Torque of 0.2Nm.

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5 WIRING
This chapter covers the wiring/cabling of the next3 installation before powering it !
GENERAL OVERVIEW
5.1.1 System block diagram
The general schematic diagram of the next3 st is given below. Letter s is for the solar and t for the transfer.

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The Australian version has 2 specificities: · The PV switch has been removed. An external PV -switch must be installed by the installer. This must be listed compliant with the Australian regulation. · The command input 1 is used for the DRM0 function requested by the AS4777.2

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5.1.2 General recommendations
The connection of the next3 charger is an important step of the installation. The next3 is designed to be robust and is electronically protected against overloads, short-circuits, overheating, polarity reversal of the battery and polarity reversal of the PV.
Be aware of the following general guidelines: · It may only be carried out by qualified professionals, aware of the rules and regulations in force. The installation must always comply with the local standards. · The cross-sections of the cables connected to its terminals must comply with local regulations even if indications are given in following chapters. · The installation materials such as cables, connectors, distribution boxes, fuses, etc. must be adapted and must be conform to the applicable laws and regulations, specially about fire hazards. · All cables in use should be isolated with PVC, TFE, PTFE, FEP, neoprene or polyimide. The installed cables must withstand at least 70°C wire temperature. Make sure that connections are correctly tightened and that each wire is connected at the right place.
The next3 falls within protection class I. It has a PE connection terminal. It is mandatory that a protective earth is connected to the AC-Source and/or AC-Loads PE terminals. An additional protective earth is located at the bottom of the unit.
The connection compartment of the next3 must remain permanently closed while the device is operating. Before opening, check that all voltage sources (AC, battery and PV) have been disconnected or switched off and wait for at least 2 minutes before opening the equipment. It is imperative to close the protection cover on the connection terminals after each servicing. Before connecting or disconnecting the entry or exit cables AC-Source, AC-Loads and ACFlex, the installer must be sure that there is no voltage present in the cables OR on the terminals.

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5.1.3 Connections overview
Connections:

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AC-Loads AC-Source

AC-Flex

+BAT

-BAT

High current protective earth connection

Communication and I/O

PV Switch

(not for

)

Sunclix connectors for PV

Any unused cable entry on the device must be sealed to prevent any intrusion. Intrusion of small animals in the unit may cause serious damages not covered by the warranty.
Open the connection compartment by removing front cover:

AC-Loads
L1-L2-L3-N
AC-Source
L1-L2-L3-N

AC-Flex
L1-L2-L3-N

BAT+

AC PE earth connection

Button battery for clock (RTC)

BAT-

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Denomination +BAT -BAT AC-Source
AC-Loads
AC-Flex

Description Protective earth connection terminal Positive pole battery connection terminals Negative battery pole connection terminals Connection terminals for the AC power supply (grid or generator)
Connection terminals for the device output.

Comment This terminal is used as primary earth connection protection. Carefully read sect. 6.3 Take care with the polarity of the battery.
See sect. 6.2 for cabling and 9.7 for settings.
Note: It is imperative that the PE terminal is connected. See sect. 6.2 for cabling and 9.8 for settings.

Connection terminals which is configurable as second device output (loads) or as second AC source (for a second genset or grid).

Note: It is imperative that the PE terminal is connected. See sect. 6.2 for cabling and 9.9 for settings. The main choice between AC-Flex being a source or loads cannot be modified when the unit is running.

PV Switch
PV+ / PVButton battery for RTC

Connection/Disconnection of all PV arrays (positive and negative poles).
Sunclix PV connectors 3.3 V (CR-2032) lithium-ion type battery socket

Note: It is imperative that the PE terminal is connected.
There is no PV Switch for the Australian model. A certified PV switch must be installed independently of the next3.
Used as a permanent supply for the internal clock to keep time when the next3 is not connected to a battery.

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Communication and I/O connections:

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See corresponding chapter for detailed wiring and protocol in use.

Pos. Denomination nxtempSensor
Studer nx-bus
Termination switch O / T (Open / Terminated)
AUX1 and AUX2 CONTACT
CAN BMS
Remote entries
RS-485i

Description Connector for the battery temperature sensor. Two connectors for internal communication between studer next3 devices such as the nx-interface or other next3 compatible units
Switch for terminating the communication bus.
Programmable dry contacts. 16A/230V
Isolated CAN bus for communicating BMS of lithium batteries Two digital inputs to indicate external changes to the unit.
Modbus connection for accessories

Comment Only connect the original Studer nxtempSensor. Only nx-bus compatible device can be connected. The connection of any other device (LAN routers, can-to-can interfaces, etc.) may damage the device. See chapter 4.6. The nx-bus is not compatible with other communication bus from Studer (for example Xtender bus). Set position (open) if the 2 connectors (3) are occupied. Set position T if only one is occupied. The connectors at the two ends of the communication bus daisy chain must be terminated. Take care not to exceed the admissible loads. C: Common NC: Normally Closed NO: Normally Open Only for CAN BMS!
See schematics in the “Wiring auxiliaries I/O” chapter.
The DRM function is implemented on the entry 1 For the communication to the vario solar chargers and powermeter.

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5.1.4 Tightening torques
The tightening torque of different connection points should be checked regularly, especially in installations exposed to strong vibrations (mobile systems, vehicles, boats, …). The table below states the recommended tightening torques for each connection:

Connection AC connector
· AC-Source · AC-Loads · AC-Flex Earthing PE connection Battery DC screws Fixing belt Plastic cover PV connection Panel mounting accessories on nx-interface

Torque
4Nm
4Nm 10 Nm 4Nm 1Nm Sunclix connectors provided 0.2Nm

An annual check of all the connection tightness is recommended. In mobile installations, the connection tightness should be checked more often.

5.1.5 Max permissible cable cross-sections summary

The maximum permissible cable cross-section for each connection is defined by the size of the corresponding cable gland, which is indicated in the below table:

Max Section AC [mm2] / Cable gland
Max -Min Section DC [mm2] / Cable gland Max section auxiliary relay, digital input, CAN and RS485 [mm2] Max PV cable [mm2] for Sunclix

NX3 5×25 / M40 2x 95 – 2x 70 / M32
2,5 6

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CONNECTING THE BATTERY
The next3 is a device which DC (battery) connection is to be connected exclusively to a 48V battery. This batterie connection is in overvoltage category 1 (OVC I). The max charging current to the battery is 300A. The maximal discharging current is the same as for charging 300A for standard controlled discharging when grid is connected. The max discharging current in offgrid is given by the load connected and depends on the surge power available, it is up to 24000kW/50V=480A for the short term surge power of 5seconds.
Due to high power of the next3, the battery cables are separated in two entries in parallel to have a more convenient handling. The recommended battery cable size is 70mm2 for a total of 140mm2 with two cables in parallel. The maximal size is 95mm2 for a total of 190mm2 section.
Battery cables must also be as short as possible, and the cross-section must conform with the applicable regulations and standards. Sufficiently tighten the clamps on the “battery” inputs.

BAT + POSITIVE

BAT NEGATIVE

Battery cables must always be protected by one of the following measures: Have a protection and disconnection device (fuse, circuit breaker) on each pole or only on the pole not connected to earth. The protection device must be rated according to the cable cross-section but must not exceed 1.25 x next3 maximum current. It will be mounted as close as possible to the battery. The maximum current in discharge in offgrid with P30 is given with 16000/48=333Adc with factor: 333×1.25=416Adc without considering surge power.
Each next3 is connected directly to the battery through its own protective device (fuse or circuit breaker) and disconnection device. It should never be connected to the output of a DC voltage regulator like solar regulator, without having the battery as a buffer. All other consumers or sources are connected directly to the battery by their own protective and

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disconnection devices.
5.1.6 Dimensioning the battery
The battery bank is dimensioned depending on the user’s daily energy consumption and the number of days of autonomy required. It is sized also in function of the wanted daily Depth Of Discharge (DOD). The dimensioning of the battery must also consider the power and the type of loads that are connected to the inverter. As rule of thumb, the maximum power of a lead acid battery is given with the capacity divided by five (C/5), in that case if all the power of the next3 is wanted (16kW), the capacity of the battery should be at least16000*5/48=1666 Ah. For lithium, see the maximum power defined by the manufacturer as lithium batteries are generally rated with a much higher current (C/3 or even 1C). Take into account the surge power of loads, for example for motor starting and the overload capacity of the inverter to dimension your battery system.
Battery bank design Lead batteries are usually available in 2Vdc, 6Vdc or 12Vdc blocks. To get the correct operating voltage for the next3 (exclusively 48Vdc), several batteries must be connected in series. The capacity of the batteries can be increased using a parallel connection of several battery strings.
The various cabling options for the battery are presented in figures below:

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Strictly conform to the manufacturer’s instructions for parallel connections, especially with lithium batteries.
5.1.7 Battery cable cross-section, DC protective and disconnection devices
The battery cables must also be as short as possible. Recommended section for the nx3 battery cables is 2x70mm2 and a 400Adc protection for standard use. The recommended cable crosssections are valid for lengths less than 3 m. Beyond this length, it is strongly recommended to oversize the battery cables (possible up to 2x95mm2 for cables connected to next3 battery poles) and consider the voltage drop in the cables. The maximal battery cable length allowed is 10m.
For safety reasons, we recommend an annual check on the tightening and corrosion of all connections. In mobile installations, the tightening of the connections should be checked even more frequently. For lead acid batteries, an individual measurement of each cell is recommended. Any divergent values can be a sign of problem.
To avoid any further loss and protection redundancy, the next3 does not have an internal fuse.
The battery cables must be protected by one of the following measures: – protection device (fuse) and disconnection device at each pole – protection device (fuse) and disconnection device on the pole not connected to the earth In all cases check local regulation and normative.
5.1.8 Connecting the battery
Start the connection on the next3 side first, without any voltage. Keep battery poles away/ protected to prevent any unwanted contact with conducting parts.
next3 side connection Insert the cable glands supplied on the battery cable before tightening the cable lugs. Crimp the cable lugs and fasten the cable gland on the device. Repeat this for all battery cables. Fix the battery cables to the appropriate connections “+ Battery” and “- Battery”. The M8 screws must be very well tightened (10Nm).

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battery-side connection Prepare the batteries for connection: appropriate battery clamps, protection device, cables in good conditions with correctly fitted clamps.
Fasten the negative cable on to the negative pole (-) of the battery and the positive cable on the open protection device. The cable lugs must be carefully fixed and tightened sufficiently to guarantee minimum loss. Insufficient tightening may cause dangerous heating at the connection point.
During the first start of the unit, it is necessary to check that the parameter values of the next3 are consistent with the recommendations of the battery manufacturer. Nonconforming values may be dangerous and/or seriously damage the batteries. See the chapter about programming and set the proper values at initial commissioning (with wizard on nx-interface).

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5.1.9 Earthing of battery
One of the two battery conductors can be earthed. This may be either the positive or the negative pole as the battery is isolated from the other potentials (PV, AC). In all cases, the installation must be in conformity with the local regulations and usage or specific standards associated with the application.
In case of earthing, the earthing conductor cross-section must at least be equivalent to the crosssection of the battery conductor. The earthing of the equipment must also adhere to these regulations. For this case, use the additional earthing screws, which are located at the bottom of the device under the AC cabling glands.

PE
Earth
(large section for battery earthing)
All the other earthing systems (earthing by means of a protection device, impedance, without earthing or earthed at battery positive pole) require the whole battery circuit to be protected against electric shocks. Any accidental contact with the conductive parts of the battery circuit is to be avoided by providing a Class II protection level.
5.1.10 Precautions when using batteries
The batteries should only be chosen, dimensioned, and installed by qualified personnel. Lead-acid batteries with liquid or gelled electrolyte produce a highly explosive gas during normal use. Other special types of batteries present similar risks. Avoid source of sparks or fire in the immediate vicinity of the batteries. The batteries must be kept in a well-ventilated place and installed to avoid accidental short-circuits when connecting. Never try to charge frozen batteries. When working with batteries, a second person is required to give assistance in case of problems. Fresh water and soap must be kept close at hand to allow adequate and immediate washing of the skin or eyes affected by accidental contact with the battery acid. In the event of accidental contact of the eyes with acid, they must be washed carefully with cold water for 15 minutes. Then immediately consult a doctor. Care is required when working close to the batteries with metal tools. Tools such as screwdrivers, open-ended spanners, etc., may cause short circuits. Sparks created by short-circuits may cause the battery to explode. Therefore, these kinds of tools must always have isolated handles and never be placed on top of a battery. When working with the batteries, all metal jewellery such as rings, watches with a metal bracelet, earrings, etc., must be taken off. The current supplied by the batteries during a short circuit is sufficiently powerful to melt the metal and cause severe burns. Batteries at the end of their life cycle should be recycled in accordance with directives from the responsible local authorities or the battery supplier. The batteries should never be thrown into fire as they may explode. Under no circumstances should you try to take apart or dismount the battery, as they contain toxic and polluting materials. For ungrounded battery systems, always check that they are not inadvertently grounded before starting to work on the batteries. Always carefully follow the instructions of the battery manufacturer.

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A battery voltage higher than 80V can cause important damage or destroy the equipment.
5.1.11 Battery temperature sensor connection (nx-tempSensor)
The operating voltages for lead batteries vary depending on the temperature. A temperature sensor is available to correct the battery voltage and guarantee an optimum charge in function of battery temperature. The temperature range of the sensor is from -25°C to 70°C. The default temperature compensation for lead acid batteries when a sensor is plugged is -3mV/°C/cell compared to 25°C. For a 48V battery this is 72mV/°C. See the configuration section of this manual for modification of the temperature coefficients. A warning is raised at 40°C and error is raised at 55°C; those thresholds can be modified. The temperature sensor nx-tempSensor is supplied with a 10m cable and the proper male connector beside. The connection has no polarity and can be done in one or the other direction without preference. The sensor should be placed as close as possible of the battery
The temperature sensor is automatically recognised, and the correction of the voltage thresholds applied immediately in case of non-communicating battery. If a communicating battery is used the temperature measures by this sensor is not taken into account as the temperature is directly given by the BMS. The nx-tempSensor temperature is recorded in the datalog.

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5.1.12 Battery with communicating BMS: CAN connection
The next3 uses a CAN Bus to communicate with the BMS (Battery Monitoring System) of a lithium battery. Lithium batteries are more complex to handle compared to lead acid batteries. A BMS is responsible of cell monitoring and battery safety. The BMS knows the status of each cell, and it computes maximum charging/discharging currents and maximum/minimum target voltages. These values must be respected when the installation is working and BMS communicates to inverter/chargers the proper setpoints for proper operation. The next3 has several CAN protocols implemented for communication with different battery management systems. These protocols are compatible with specific batteries. See the Studer-Innotec website for the up-todate list of compatible batteries, brand and models: https://technext3.studer-innotec.com
Updates the next3 software to have the latest communication protocol.
Beware of the pinning order (CANH, CANL, GND) on the connector, see instruction of the BMS manufacturer carefully. An appendix about various lithium batteries is available.

For a point-to-point connection, the bus termination should be set to T (Terminated). If the device is in the middle of a daisy chain, the termination is set to O (Open). Generally, the next3 is connected point to point to the BMS and the termination should be on T.
Most of batteries BMS have a specific connector for CAN connection and a specific pinning for the wiring. There is no standard. Even with a RJ45 connector, the pinning may vary. The cable must be adapted by the installer case to case, respecting the signals (GND, CAN-H, CAN-L).
As example here is the pinning for the CIA-303-1 :

That must be wired/screwed with the provided connector: Configuration with compatible batteries :

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Autarctech – LiRack/ LiTerminal Archimede Energia – FXO-048- PowerTech

–

BMS

Orion

Jr XXX-TCX

PowerRack

(www.orionbms.com)

Cegasa – eBick Pro 180

BMZ – ESS 3.0 ESS 9.0 X

Commeo – 48 V system

BSLBATT LFP battery

Cosun – RS-Box

BYD – Premium LVL/ LVS, B-Box Pro Solarni Panely – HomeGrid

2.510.0, B-Box Pro13.8

BMS

Cegasa eBick Ultra 175 ES

Super-B – 12V SB12V160E-ZC

Leclanché – Appollion Cube, and SB12V100-ZC

TiBox

Weco – 4K4 LFP/ 5K3R20

LG Chem – RESU series*

Midac – RES 4.2/5.1

Pylontech – UP2500, US2000,

US3000, Phantom-S

REC – Q BMS 16S

Solar MD – SS4074/SS4037/ SS202

Systems Sunlight – Li.ON ESS

Tesvolt – TS 25-50

Vision Mechatronics – LiRack, Lirack

Eco

Fortress Power eFlex 5.4

systems

BlueNova – BN 13-26-52 series Freedom Won – Lite Range Pallas – RESS 48V50

Cegasa – eBick Ultra 100

Soltaro – SOL-R16-2.5KWH and

Discover – AES 44-24-2800 and SOL-R16-5.0KWH

42-48-6650, LITHIUM PRO

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Tech user manual next3

Zruipower – Power Base Pro

Studer Innotec SA next3

IPS (Integrated Solution) liCube LiFePO4-System

Power modular

GS-HUB Home Hub

DLG ESS48-2U-L

Zruipower – ZR-FC48100- UZ Battery Power Lite

1630J1, ZR-FC4850-1630J1

L051100-A1,

L051100-B,

L051100-D

The next3 is supplied without batteries, please, refer to the manufacturer for warranty conditions and availability.

Tech user manual next3

V3.6 © Studer-Innotec SA

Studer Innotec SA next3
CONNECTING THE AC (ALTERNATIVE CURRENT)
Dangerous AC may be present on the connection terminals. Make sure that the inverter is deactivated and that there is no AC or DC voltage present on the AC terminals before proceeding with the connection. The AC connection is in overvoltage category 3 (OVC III).
On the next3 model, remove the cover plate by unscrewing the two screws to access the AC terminals and protective earth. The connections inside are shown on the figure below:
There are 3 AC connections:
· AC-Source: connection for the main AC source. A grid or a generator. This input has double security relays for disconnection according to safety and grid code requirements like VDE-0126 and others. In case of grid connection, always connect the grid to AC-Source. In offgrid, a single-phase source may be used and connected to the L1 of the AC-source. For example, for a single phase genset as a backup. To fulfill voltage fluctuations and flicker limits requirement, the maximum permissible impedance of the wiring must be lower than 0.15 + j0.15 for each phase and 0.1 + j0.1 for the neutral.
· AC-Loads: connection for the loads, that are supplied by the inverter. The 230 V and 400V consumers must be connected on the “AC-Loads” connection terminals with the wire crosssection conforming to the standards regarding the rated current at the next3 output.
· AC-Flex: this is a configurable connection to be connected to loads or to a genset. The choice of configuration is done at the setup of the system during the Wizard procedure. The AC-Flex configuration is fixed and cannot be changed anymore in operation for security reasons.
On models without transfer (nx3-16000-48 and -s) there is no AC-Source and no AC-Flex connections.

AC-Loads L1-L2-L3-N
AC-Source
L1-L2-L3-N

AC-Flex L1-L2-L3-N

PE Earth

Refer to the general schematics (block diagram) at the beginning of this chapter for a better understanding. The next3 terminals are marked in the following way:
N = neutral L = lines (L1, L2, L3)

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Tech user manual next3

= protective earth (connected to the enclosure of the device). Example of connection for AC loads

Studer Innotec SA next3

Insulation tests:
At commissioning of an electrical system, insulations tests are performed on the wiring (in some countries, depending on local regulation). It is performed applying high voltages on the cables and measuring the leakage current. This must be done without the next3 in the loop. Overvoltage surge protections included in the next3 will invalidate the tests. Insulation between circuits and the ground is tested in factory for every next3 unit manufactured according to the device IEC/EN 62109 and IEC/EN 62477 safety standards.
5.1.13 Sizing of AC protective devices
The source must be connected to the input terminals marked “AC-Source” with sufficient wire crosssection, depending on the power output of the source, and protected by a protection device of the appropriate rating. In any case it must be maximum 80A per nx3.
For people safety, we recommend using residual current devices (RCD) for loads at the output of the nx3. Take care of the earthing and neutral system for proper operation of the RCD. In any case, AC distribution must comply to the local standards and regulations, and generally, be realised through a distribution panel in an enclosure.
For cables protection, no downstream protective device is formally required if cross-sections of cable used for distribution satisfy to regulatory requirements for the largest rated output current listed on the nameplate of the next3. The next3 is protected against overload and short-circuit and will stop in those cases. When connected to a source, the upstream protection must stop short-circuits currents from the grid/genset.
When next3 connects to any AC source or AC Loads, there is never inrush current.

Tech user manual next3

V3.6 © Studer-Innotec SA

Studer Innotec SA next3
Due to the source assistance function (Smart-Boost), the current at the output of the device may be higher than the rated current of the inverter. It is the sum of the current supplied by the additional source and the current supplied by the inverter. In this case, the dimensioning of the output cables will be carried out by adding the current indicated on the protection device located on the upstream of the unit, to the nominal current of the inverter.
If circuit brakers (CB) are installed at the output, we recommend B curve devices. They will be sized at maximum to the highest value listed on the unit’s nameplate or by the addition of the first value plus the value of the input protective device. (i.e. inverter current + input current). As example, if the AC Source current is 50Aac per phase and knowing that the current of the inverter is (16000/230/3)=23Aac per phase, the total current on the output would be 73Aac per phase. In any case it must be chosen according to the cable size downstream.
If the source assistance function (Smart-Boost) is not used; the size of the protection device for the AC-loads output will be established at a maximum value equal to the rated current of the inverter, or at the maximum value of the protection device at the input if that one exceeds the rated current of the inverter.
If the AC-source is not used the protective device will be sized equal or smaller than the smaller value indicated on the nameplate.
The next3 is intended to be supplied by alternative voltage sources such as the grid or a generator. Check that the rated voltage of the source corresponds to the rated voltage of the next3 model specified on the nameplate on the side of the next3.
The conditional short-circuit (Icc) is 45Arms at the output (AC-Loads and AC-Flex if configured as secondary loads) of the next3 when next3 is in stand-alone mode. DDR is mandatory for circuit breaker at output (AC-Loads and AC-Flex if configured as secondary loads) of next3.
The maximum prospective short-circuit current Icp of the sources connected to next3 inputs (ACSource and AC-Flex if configured as secondary source) is 15kArms.
The minimum prospective short-circuit current Icp of the sources connected to next3 inputs (ACSource and AC-Flex if configured as secondary source) is 1,6kArms.
The rated short time withstand current Icw of the next3 inputs (AC-Source and AC-Flex if configured as secondary source) is 16kArms during 500ms.
The rated peak withstand current Ipk of the next3 inputs (AC-Source and AC-Flex if configured as secondary source) is 25kArms.

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Tech user manual next3

Studer Innotec SA next3
5.1.14 AC Neutral and Earthing system
The next3 is a unit with protection class I, which is intended for cabling in a grid type TT, TN-S or TNCS. Its metal case must be earthed. The earthing of the neutral conductor is carried out at a sole installation point, upstream of the RCD circuit breaker (in domestic application, generally type A, 30 mAac). The neutral insulation to the earth is checked by the device and errors will be raised by the next3 if the measurements don’t correspond to the settings of the device. The next3 case and/or the PE connector, depending on the local installation rules, must be connected to earth. The PE cross section must be as big as the cross section of the line or neutral conductor, but the minimum cross section must be at least 10mm2.
= protective earth (connected to the enclosure of the equipment).
PE for AC cables Earth
In any case, the protective earth must be connected in accordance with local standards and regulations in force. The protective earth of the equipment must be connected at least to the protective earths of all the Class I equipment after and before the next3 (equipotential connection). The information, notes, recommendations, and diagrams reported in this manual are examples and must in any case be adapted to local installation rules. The installer is responsible for the conformity of the installation with the local standards in force.
An additional earthing terminal is present under the AC-cables glands at the bottom of the unit. It can be used instead of a connection on the input terminals of the device, particularly when cable cross-sections used at the output do not allow the use of a five-wire cable (lines L1 L2 L3, earth and neutral) through the conduit glands of the connection cables of the input and output (AC-SOURCE, AC-LOADS and AC-FLEX), or when the earthing of one of the poles of the battery. PE required using same or greater cross-sections than the battery cable when the battery is grounded.

Tech user manual next3

V3.6 © Studer-Innotec SA

Studer Innotec SA next3
PE for large section cables
Stationary installation and earth neutral scheme In a stationary installation where the neutral is connected to the earth at a single installation point upstream of the next3, the standard case for the next3 is to use an automatic connection of the neutral output line of the inverter to the earth when operating in island mode (Neutral-Earth is in mode Offgrid Self-Managed). In case of doubt, wire the earth properly and use this default mode.
It is also possible to carry out a connection of the neutrals to preserve an unchanged earthing system downstream, independent of the operating mode of the next3. This is called “Solid Neutral” mode. It may not be accepted for security reasons. Please check your local installation rules. This configuration is not recommended by Studer. Example of solid neutral connection inside of the connexion box:

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Tech user manual next3

Studer Innotec SA next3
Safety is guaranteed by the equipotential bonding and by any RCD circuit breakers placed downstream. This solid neutral connection is not permitted in a floating installation if a socket is installed upstream of the next3 (typically in mobile application). It is not possible to mix the configuration of solid neutral and self-managed programming in the case of use of a grid and of a genset. See the earthing relay configuration in the system configuration. The description of the earthing errors are done there.

Tech user manual next3

V3.6 © Studer-Innotec SA

Studer Innotec SA next3
Mobile installation or installation connected to the grid via plug connector When the input of the device is connected directly to the grid via a plug, the plug must remain accessible.
The connection (link) between the neutrals upstream and downstream of the next3 is not permitted in this configuration.
In the absence of voltage at the input, the neutral and live are interrupted, thereby guaranteeing complete isolation and protection of the cabling upstream of the next3. The earthing system downstream of the next3 is determined by the upstream earthing system when the grid is present. In the absence of the grid, the earthing system downstream of the inverter is in isolated mode. An automatic connection with an internal relay can be programmed with settings.
This connection type guarantees the optimal continuity for supplying the next3 loads. The first isolation fault will not lead to an interruption in the supply. If the installation requires the use of a permanent isolation controller this would have to be deactivated when the TT network is present at the next3 input.
All sockets and protection class I devices connected downstream of the next3 must be properly connected to the earth (earthed socket). The cabling rules above remain valid, including in installations, in all cases where the next3 input is connected to the grid via a plug connector.
Next system without transfer On models without transfer (nx3-16000-48 and -s) there is no AC-Source and no AC-Flex connections. These models do not have programmable earthing relay either. Thus, user must guarantee complete isolation and protection of the system. In such installation it is recommended to bond directly the neutral to the earth at one point in the system.

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Tech user manual next3

Studer Innotec SA next3

RCD breakers
For people safety, RCD breakers should always be installed. This requires a proper grounding of the neutral to work properly. As the next3 can work in offgrid mode and interrupts the live and the neutral wires, the earth automatic connection to neutral (offgrid self-managed setting) should be used. The RCDs are placed after the next3 in the distribution box.

In case of a bypass use with both AC-Load and AC-flex bypass, there must be at least 2 RCD as the live wire are independent.

Introduction with main fuse

Transfer switch for main loads RDC
1-0-2

1-0-2

AC-Source

AC-Loads AC-FLEX

Automatic management of grounding

Transfer switch for AC-flex loads

Consumer loads Flex Consumer loads

Tech user manual next3

V3.6 © Studer-Innotec SA

Studer Innotec SA next3
5.1.15 Commissioning
At commissioning various tests are performed by the electricians (according to the local rules).
Insulation tests At commissioning of an electrical system, insulations tests are performed on the wiring (in some countries, depending on local regulation). It is performed applying high voltages on the cables and measuring the leakage current. This must be done without the next3 in the loop. Overvoltage surge protections included in the next3 will invalidate the tests.
The insulation between the circuits and ground is tested at the factory for each next3 unit manufactured in accordance with the safety standards IEC/EN 62109 and IEC/EN 62477, before the final installation of the surge protectors. The manufacturer Studer Innotec therefore guarantees the correct insulation of the unit to earth in this case. The installer must check the wiring without the presence of the next3.
Short circuit current and overload behaviour In island operation (offgrid), when the inverter is not connected to the grid but operates on battery power, the output impedance of the next3 device is so that it cannot pass the standard short-circuit current tests carried out at the commissioning of an electrical installation. Nevertheless, in case of a fault (short circuit, overload) the current is electronically limited by the device. When a short circuit occurs, it is detected, and the device stops automatically. Safety is ensured in this case. The short-circuit current of the next3 in island mode is 45Arms. In grid connected mode, the short-circuit current is given by the grid as inside of the next3 is just a contactor.
A next3 device detects a short circuit when the voltage falls below 50% of the rated voltage at maximum current limitation, the device will then shut down within 0.5 seconds. For a limited overload, when the voltage drops to less than 80% of the nominal voltage during a current limitation, then the device stops after 3 seconds. By default, the device tries to restart after 1 second for a maximum of 3 times. The number of attempts is reset to zero after 30 seconds of normal operation. All these parameters can be set in “Expert” mode. Studer Innotec recommends leaving the default values.

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Tech user manual next3

CONNECTING THE PHOTOVOLTAIC GENERATOR

Studer Innotec SA next3

The next3 has an internal solar charge controller made of two independent MPPTs. Each MPPT can stand up to 8kW of photovoltaic (PV) power and has maximum operating PV input current of 20Adc.Each MPPT has 2 inputs and then up to 4 strings can be connected to the device. The two inputs of the top (MPPT1) are connected internally, as well as the two at the bottom (MPPT2). The rated current of the PV generator can be higher as the next3 limits with electronic control the maximum taken from the generator in any case. In any case the maximum short-circuit (Isc) current is 27Adc.

The next3 solar inputs are intended to be connected exclusively to a source like a photovoltaic generator, excluding any other energy source.

PV connection is in overvoltage category 2 (OVC II). The next3 is designed for PV generators supplying up to 900Vdc. This voltage is dangerous for human beings. During the installation or the maintenance of the system, it is mandatory to make sure that no dangerous voltage may surge in the system. The disconnection device must be open and secured against any accidental reclosing. When the photovoltaic array is exposed to light, it supplies a d.c. voltage to the next3.
PV modules must have a Class A rating according to IEC 61730. The backfeed current to the PV is 0A, it is prevented by design of the electronic.
5.1.16 PV string dimensioning
The next3 accept input voltages between 200Vdc and 900Vdc max. It starts operating from 200Vdc (start-up in the morning) and will continue to operate even if the voltage decreases down to 100Vdc (shut down in the evening, partial shading, etc.). The 200Vdc are necessary to detect a proper ground insulation of the PV before starting the system. The nominal power of each MPPT channel is 8kW. The maximum short circuit current is 22A and current in operation will be limited to 20 Adc. The maximum voltage allowed is 900Vdc. See below the PV input characteristics:

Tech user manual next3

V3.6 © Studer-Innotec SA

Studer Innotec SA next3

Tests of the efficiency performed by an independent lab showed the following result for the conversion efficiency from solar to grid:

Efficiencies next3
Max solar to grid conversion: Max solar to battery conversion: Max solar battery to grid conversion:
Max mppStatic: Max mppDynamic:
European efficiency (*solar to grid): Californian CEC efficiency (*solar to grid): *Upv=700V used for solar efficiencies

97.0% 95.0% 95.0%
99.7% 99.0%
92.0% 93.0%

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Tech user manual next3

Studer Innotec SA next3
Maximum current of the solar generator
The maximum short circuit current Isc allowed for selecting module is 22Adc. In operation the maximum current will be limited to 20A and the power per mppt to 8kW. Over dimensioning of the PV array is allowed. Per example to maximize production in winter even if there are losses in summer. In that case you have to ensure that the cable sizing and protections are installed according to the maximum short-circuit current. In any case, the next3 will limit the PV current and/or the charging current (battery) to the rated and/or programmed currents. All those limitations are automatically managed by the next3 and there is no risk in case of over dimensioning the PV input power/current. The power production is electronically controlled and optimally dispatched in the system due to the PFD technology (Power Flow Dispatcher). In some situation, the PV production could be limited by various other reasons at a systemic level because the next3 is in interaction with other elements. The battery has a charging current limit which can be further limited depending on the charging phase or the battery voltage. In offgrid application when the battery is full, the production will equal the AC loads. The maximal PV injection to the grid when there is no battery charging is 15kW (3x5kW grid feeding limitation).

Solar strings design
The solar generator is normally dimensioned to cover an important part or the entire energy requirement of the system. Once the PV power has been decided upon, it will be distributed among one or more MPPT units, wisely combining the modules among them. Modules with the same orientation and the same shading (if there is some) must be connected in the same string or there will be a risk of important mismatching losses. These combinations in series and in parallel must be carried out according to the voltage and current limits of the next3 MPPT inputs. A margin to the Voc must be taken in countries with cold climate due to the thermal coefficients of the modules. Typically, a factor of 1.15 is taken in Switzerland up to 800m altitude (900V/1.15=782V), a margin of 1.2 between 800 and 1500m (900V/1.2=750V) and 1.25 above (900V/1.25=720V).

An example is provided below for a single MPPT string (example with 310W modules, 60 cells, 41Voc).

N° modules in a

string

1 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Voc (STC) [V] 41 287 328 369 410 451 492 533 574 615 656 697 738 779 820 861 902

P dc (STC) [W] 310 2170 2480 2790 3100 3410 3720 4030 4340 4650 4960 5270 5580 5890 6200 6510 6820

One string

Vmpp NOCT [V] 30 210 240 270 300 330 360 390 420 450 480 510 540 570 600 630 660 P dc (NOCT) [W] 230 1610 1840 2070 2300 2530 2760 2990 3220 3450 3680 3910 4140 4370 4600 4830 5060

Two strings in parr on one MPPT

P dc (NOCT) with two modules in parrallel [W] 460 3220 3680 4140 4600 5060 5520 5980 6440 6900 7360 7820 8280 8740 9200 9660 10120
In the case of a 310W module with 60cells between 8 and 20 modules are recommended. 7 modules could be theoretically sufficient to start the inverter but in real conditions this could provide too little voltage.
21 modules in series are possible in hot countries (without margin! Consider the local installation rules) and about 17-18 in cold countries. The open circuit voltage must be carefully checked with temperature coefficients given by the PV modules manufacturer.
When two strings are in parallel on one MPP channel, there can be up to maximum 17 modules in series order to avoid PV production capping. Up to 20 modules can be used with a high probability of capping. In total between 10 (3.1kWp) and 80 modules (24.8kWp 4x 20modules) can be connected, giving a high flexibility for the dimensioning of the energy system.

Tech user manual next3

Studer Innotec SA next3
5.1.17 Connection
The two MPPT with each 2 connections are situated below the next3:

MPPT 1

+
PV+ 1.1

PV+ 1.2

MPPT 2

PV+ 2.1

PV+ 2.2

–
PV- 1.1
PV- 1.2 PV- 2.1
PV- 2.2

SOLAR

switch

(

Not for AU, shall

installed

externally)

the PV+ is situated left and the PV- is situated right. Check carefully the indications written on the NX3 in case of doubt.

For one MPPT, if two strings are connected in parallel, they must be composed of the same types of modules, and the same number of modules, to avoid voltage mismatch and production losses.

Tech user manual next3

Studer Innotec SA next3
The Australian version has a specificity: · The PV switch has been removed. An external PV -switch must be installed by the installer. This must be listed compliant with the Australian regulation (DC isolator certificate AS60947.3)

5.1.18 Earthing of PV
The MPPT topology is non-isolated for best efficiency, so the poles of the PV must not be grounded. The electronics was designed to avoid fluctuating voltages on the PV poles. In operation, there is a constant voltage on PV+ and PV- compared to the ground referential. This avoids leakage current through the parasitic capacity between cells and ground and therefore avoid problems with RCD breakers (return current default).
The PV input of the next3 is non-isolated, which means the PV+ and PV- must be floating (similarly to the majority of Transformer Less, TL, solar inverters). The PV must not be grounded. Accidental grounding will be detected and cause a stop of the next3 inverter. The frame of the PV modules should be grounded. PV modules must have a Class A rating according to IEC 61730.
As the Open Circuit voltage (Voc) of the panel is above 60Vdc (in all the temperature range), the whole solar system must be installed according to protection class II. Use proper connectors and cables for all the solar system, as requested by local regulation.

Tech user manual next3

Studer Innotec SA next3
Never ground PV+ or PV-. Ground the PV modules frames
5.1.19 Cables and cross-section
The next3 is build from factory with Phoenix Sunclix connectors for the PV inputs of the MPPTs. There are4 pairs of Sunclix connectors provided with the unit to assemble on your PV wires arriving to the unit. These connectors can be assembled without special tool. A flat screwdriver is necessary to decouple the connected once enclicked.

(image from phoenix contact, supplier of Sunclix connectors)
The minimal section for cables in Sunclix connectors is 2.5mm2. Sunclix connectors are rated: 2.5mm2: 27Adc / 4mm2: 40Adc / 6mm2:40Adc. We advise you use a 4 or 6mm2 cross section to reduce the cable losses in the system even if a 2.5mm2 cross section would have been enough. In any case follow local regulation for cable sizing regarding the short-circuit current (Isc) of the PV generator and length of cables.
If you wish to install two PV strings in parallel for one MPPT, this can be assembled as well out of the Next3, for example in the junction box on the roof. This can minimize the number of cables used. The parallel strings can be connected together before the next3 solar entry as long as the maximal shortcircuit current (Isc) of 22Adc is not reached.

Tech user manual next3

Studer Innotec SA next3
5.1.20 Protection devices
Wiring protection devices (fuses, circuit breakers) connecting the PV generator to the next3 must be installed in accordance with local standards and regulations in force. Special rules are existing for fire hazard and access to switching devices by firemen. The internal PV switch of the NX3 disconnects all poles between the PV generator and the charge regulator. PV modules are often exposed to stormy weather. It is highly recommended to install lightning protection. This is mandatory in some countries. Please see local standards and regulations in force.

Tech user manual next3

Studer Innotec SA next3
LIGHTNING PROTECTION
According to the installation site, it is highly recommended to develop a protection strategy for your installation. The strategies depend on various factors specific to each site; we recommend therefore a professional approach to this issue. The next3 has internal protections against lightning by means of surge protection devices. These devices have an energy dissipation capacity limited to 3,5kA (8×20 µs) which guarantees a certain protection level but are not a total protection against lightning. Furthermore, these protections are for single use. Therefore, in the event of a lightning strike where these surge protections are hit, you’ll have to send the unit for repair. They cannot be replaced nor repaired on site.
Damages due to lightning often result in significant costs (full replacing of the printed circuit board, PCB) and are not covered by Studer Innotec’s warranty.
Contact a specialist on surge protective strategies to check how you can best protect your system in all inputs/outputs (AC and DC).

Tech user manual next3

Studer Innotec SA next3

CONNECTING THE STUDER COMMUNICATIONS CABLES
The Studer nx communication bus is used to interconnect next3 inverters in the case of a multi-unit application, to connect the nxinterface or to connect other types of devices with communication compatibility.

The NEXTs are equipped with a pair of RJ45/8 connectors that allow information transfer via a communication bus in between next3 devices or accessories that use the proprietary protocol of Studer-Innotec. In this network, all parties in the network are connected in daisy chain.

Communication and I/O

The cables for Studer nx bus are straight ethernet of category 5 exclusively with 26AWG wire size (power supply through cable). They are provided by Studer or you can buy your own as long as it follows these requirements. The total length of the communication bus cable between all units must not exceed 75 m.

The switch for the communication bus termination remains in position T (terminated) except when both connectors are in use. In this case, and only in this case, it must be placed in the O (open) position. If one of the two connectors is not in use, the termination switch will be in position T.

In a system comprising a single next3, the connection of the nx-interface or nx-gateway units may be conducted without stopping the next3 (hot plug).

A single connection is used : T

Both connections are use : O … Both connections are use : O

A single connection is used : T

These connectors must be used only to connect a compatible next3 accessory, excluding any other type of connection such as LAN, Ethernet, ISDN, batteries BMS, etc.
The next3 communication is not compatible with other Studer communication. It is not compatible with Xtender devices and it must never be directly connected together.
Any unauthorized connections could cause the destruction of the devices.

Tech user manual next3

Studer Innotec SA next3
A standard configuration with 3 next3 and one nx-interface is shown here below:

When connecting one device with other compatible devices using the same communication bus, it is highly recommended to make a software update of all components in the system to guarantee their proper compatibility/functionalities. Therefore, before starting the setup of the device, download the latest software version from our website: www.studer-innotec.com and copy it to an USB key. The update is made by the remote control nx-interface.
5.1.21 Connection of the nx-interface
The nx-interface can be fixed on the nx3 with the dedicated support or hanged remotely in a place closer to the end-user of the system. It must be connected to the studer nx-bus. The total communication cable length in a system is 200m. The nx-interface is powered through the cable, so his type must be ethernet of category 6 exclusively with 24AWG wire size (power supply through cable).
Studer nx bus
Studer nx bus Termination

The state of the Studer nx bus termination on the nx-interface can be seen on the screen, this is only for the connectors situated on the nx-interface. Note: the RS-485i and the CANi on the nx-interface are unused for the moment.

Tech user manual next3

5.1.22 Connection to Internet

Studer Innotec SA next3

The connection to your LAN and internet is done with the nx-interface on the Ethernet port.

Ethernet connection
Differentiate carefully the ethernet connection with the two led on the low side of the connector. The second way of connecting the next3 to the internet is the use of Wi-Fi. This is done with the Wi-Fi USB stick provided by Studer-Innotec. Use only the official Wi-Fi USB stick provided by Studer-Innotec because the nx-interface needs to have the proper driver. There is little chance that a third-party Wi-Fi stick works properly without the proper drivers.

For the LAN connection, there is no setup to do. For the Wi-Fi connections, you must select the Wi-Fi network and enter your password. The internet connection set up is described in the programming chapter of this manual. See the chapter “configurations” for the setup of the internet connections.
In remote area, you can find your own GSM 3G/4G/5G router (not provided). Studer-Innotec is not responsible for the proper operation of those devices and of your internet connection.

Tech user manual next3

Studer Innotec SA next3
WIRING AUXILIARY I/O
Auxiliaries are all located at the bottom of the next3.
5.1.23 Auxiliary contacts
There are two reversing contacts that are potential-free available in nx3 unit.
Various settings are available to give activation conditions to each contact. To program functions to these contacts, please refer to the chapter about the configuration of the next3 and the section about the auxiliary contact in this manual.
Wire the C (common) in any case and the second position in function of your application and your settings. In relax state, there is a contact between C and NC (Normally Closed). An activation gives contact between C and NO (Normally Open) and disconnect C and NC. The representation of the contact near the terminals corresponds to the status of the contact when not activated.
Male connectors are provided with the NX3. The admissible currents and voltages for these contacts are 16 A: 250 Vac/24Vdc or 3 A: 50 Vdc max. The connector has a male and female parts. Doublecheck the correct pinning when plugging the connector on the nx3.

Tech user manual next3

5.1.24 Command Inputs

Studer Innotec SA next3

IN1 and IN2 are inputs that can be active with a 5 to 60Vdc voltage to the return reference. The

nominal voltage is 12V.

The 4 poles connector is supplied

with the nx3. Double check the

12 Vdc

correct pinning when plugging

the connector on the nx3.

A +12Vdc supply is available on the connector for the use of dry contacts. Don’t use it for other purpose than the activation of input entries. The current is limited. External 12Vdc are activated/deactivate with settings in the device menu (settings on the nx-interface).
The various possibilities are given with the schematics below:

5-50 Vdc

For activation with a dry contact: Supply voltage with +12Vdc, go to the contact and come back to the wanted input (in1 or in2)

For activation with an external source: a potential of 5Vdc to 60Vdc must be applied between an input and the return. Entry impedance is 10kOhm

Tech user manual next3

Studer Innotec SA next3
5.1.25 DRM function and command input 1 (AU-NZ version)
The Australian version of nx3 has a specificity regarding the inputs. The command input 1 is used for the demand response mode DRM0 function requested by the AS/NZS4777.2 when Australia or New Zealand grid code are selected. Available DRM inputs (only DRM0):
The DRM0 mode is asserted by shorting the terminal block “RG/0” and “CL/0” positions of the DRM port. The next3 will detect the DRED system cable missing and the inverter will not connect to the grid. If no DRED system is connected to the next3, then a DRED bypass device should be connected as specified in the AS4777.2 (15kOhm). In multi-unit system, always use the remote entry 1 of the first inverter for this functionality.
The second input in2 is available for other freely programmable functions and is activate as described above with a 12V short with a dry contact or an external voltage.

Tech user manual next3

Studer Innotec SA next3
5.1.26 RS485i
This physical connection is unused. A communication to accessories will be available in the future, keep updated… Note that a Modbus slave to read values and change settings of the system is implemented on the nx-interface, not on this connection. See the chapter about the nx-interface and on Studer website, https://technext3.studer-innotec.com/modbus-next

Tech user manual next3

Studer Innotec SA next3
MULTI-UNIT CONFIGURATIONS
Up to three next3 units may be used together in parallel. They are connected on the same battery bank or on separate battery banks to create a high-power inverter-charger system. Two units of next3 can work in parallel creating an 32kVA inverter with an 80A transfer (55kVA). Three units of next3 can work in parallel creating an 48kVA inverter with an 80A transfer (55kVA). This is available from the software version 1.3.0.0 and higher.

The following points must be followed: · In multi-unit systems, next3 are interconnected via a communication with “Studer nx communication bus”. This is mandatory for proper synchronization of units that must absolutely work together · Units should be close to each other (in the same room). · Each device must have the same software version, updates are available on the Studer website (https://technext3.studer-innotec.com or https://studer-innotec.com/downloads/ ). · The nx-interface is mandatory for configuration. · All elements must be connected together and powered before the initial configuration. All elements must be clearly identified during the configuration process with the wizard. · Use only one nx-interface per system. The system will not work properly with multiple nxinterface communicating at the same time on the bus. · A reconfiguration of the system with the wizard is mandatory when you add new elements to the system. · All the AC-Loads connections of each next3 units of a system must be connected in parallel, for each respective phase (through a distribution panel for example). · All the AC-Source and AC-Flex ports must be kept separated. The purpose of each port is chosen during the wizard. · All the AC-Flex ports configured as FlexLoad must be kept separated. The different AC-Flex can be programmed separately. · Only one AC-Source connection for the grid (if available), and one AC-Source or AC-Flex for the genset (if available) will be used in a system. There is an identification process during the configuration of the system with the nx-interface (wizard). That means the maximum transfer is 80A and 80x230x3= 55.2 kVA. · The three next3 work as one in a system, except for: o The PV inputs are independent. o The AC-Flex as load can be programmed independently, they must not be wired together. o The AUX relays and CMD IN are independent. · The compatibility is only between next3 units. Don’t mix with other Studer-Innotec products like the Xtender. This will not work and probably damages the devices. · In many countries, the official metering of solar installations change of category above 30kVA and requires a different scheme. Be sure to respect the local regulations for this point.

Tech user manual next3

5.1.27 AC in multi-units

Studer Innotec SA next3

There is only one grid and one genset connection in a system. The different AC-Source of each next3 must be kept separated. Below is the example for the standard grid-connected case for two units.

AC-Loads

AC-source And for three units:

CAN-BMS AC-Loads

AC-Source
CAN-BMS
During the wizard, the proper unit that is physically connected to the grid/genset must be selected. See the configuration section of this manual for details about the setup of multi systems with the wizard.

Tech user manual next3

Studer Innotec SA next3
When using a genset at the same time as the grid, it is advised to use the AC-Source of the second inverter. One is connected to the grid and one to the genset. That way all AC-Flex are available for flexible loads.
AC-Loads

AC-Source of next3 n°1

AC-Source of next3 n°2

CAN-BMS

5.1.28 Battery in multi-units
In a multiunit system, one battery with BMS is communicating with one next3, they must be physically connected with the CAN-BMS cable, and it must be paired properly during the wizard process.
It is allowed to have one common battery or multiple batteries. With one common battery, the canBMS is linked to one next3 only. It must be identified and configured during the wizard process.

CAN-BMS
Don’t mix the communication bus of the batteries with the nx-bus. The communication with am BMS must be done with the battery wired to the same next.

Tech user manual next3

Studer Innotec SA next3

CAN-BMS
The communication bus to the battery BMS, the battery DC connection and the nx-bus are isolated from each other’s. There is no special requirement for the connections of multiple batteries. Per example, the minus (or plus) can be common, but this is not required. Each pole can be grounded or left floating. The installer is not constrained by the next3 but must respect the official installation rules of his country for his type of application.
With lead acid batteries, each next must have its own temperature sensor.
In multi-unit systems, the charge/discharge current of each unit is automatically chosen by the PFD (Power Flow Dispatcher, which is a patented control algorithm). Just give the properties of each battery during the wizard process.
The used rules are: · The charge/discharge is distributed proportionally to each battery capacity. · The charge/discharge limits are used independently. · Each SOC is managed independently and limits are respected (if they are not at the same level at start per example or bad configuration was done).
Example: two next3 are in parallel and only one has solar connected to its MPPT entries. In that case the two batteries are charged anyway, proportionally to their battery size. The energy flows through the AC-Loads common connexion.
5.1.29 Extension of an existing installation
It is possible to extend an existing installation by adding one similar next3 units in parallel. The software compatibility of the new and old units is mandatory.
Equipment belonging to the same system must be operating with the same software version. Download the latest software version from the Studer’s website and update the software for all units of the system independently before commissioning.

Tech user manual next3

Studer Innotec SA next3
6 POWER-UP OF THE EQUIPMENT

There are dangerous energy sources inside the cable compartment. It is imperative that the closing cover for the connection compartment is installed and screwed tight before energizing the installation!
The powering of the next3 starts with the battery. The unit cannot be powered by AC or solar without battery. Verify that the PV DC switch is open and there is no voltage presence on the AC wires. When supplying the 48Vdc voltage on the battery connection, the next3 device beeps and all lights turn on for a few seconds. After that, your next3 installation is in the following state:
· The next3 is OFF (no AC voltage on the AC load connector) · The red LED (with”!” sign) is permanently light on, because the next3 is OFF (LED2) · The battery is connected (battery symbol is light on) (LED6) · The voltage production on Ac Load is disabled (house symbol is light off) (LED5) · The solar chargers are disabled (PV array symbol is light off) (LED7) · The connection to Ac Source is disabled (grid/genset symbol is light off) (LED3) · The Ac Flex is disabled (both grid/genset and house symbols are light off) (LED4) · The nx-interface lights-up and start his boot process.
INITIAL CONFIGURATION
A next3 installation requires an initial configuration with the nx-interface. This must be done following the configuration wizard. Be sure to have an nx-interface on your installation for the first commissioning. The next3 will not start its operation without this first configuration.
FRONT PANEL BUTTON
In the middle of the front panel, the ne[xt] part is a button with the following functions available depending on how long the button is pressed:
· Impulse push: clear error(s), stop beeping · Short: 1 second < press < 3 seconds: ON/OFF of next3 and all its functions. Signalled by one
beep after 1 second. · Long:3 seconds < press < 10 seconds: the button has no effect when you release it, this is for
the case when you pressed long by mistake. Signalled by two beeps after 3 second. · Longer: press >10 seconds: all devices are reset. Signalled by 5 beeps after 10 seconds.
You can hear a beep after ~1sec, ~3sec and ~10sec and you can release the button to achieve the associated function at that moment. The front panel button can be deactivated/activated via the nx-interface (but it’s not advised).
To power ON the next3 and all its functions: push the front panel button until you hear the first beep (or use the ON/OFF button of the nx-interface). After this, your next3 installation is in the following state (please note that it takes ~5sec to start all converters):
· The next3 inverter is ON. · The “!” red LED is permanently off, because the next3 is now ON without errors · The battery is connected (battery symbol is light on) · The voltage is provided to Ac-Loads (house symbol is light on) · The solar chargers are enabled (PV array symbol is light on if the solar chargers are working,
or blinks once if the solar chargers are not working because there is no sun) · The connection to Ac Source is enabled (grid/genset symbol is light off or light on depending
on your configuration) · The Ac Flex is enabled (grid/genset and house symbols are light off or light on depending on
your configuration)

Tech user manual next3

Studer Innotec SA next3
Your installation is now in operation! If the system requires configuration or setting modifications, carry them out immediately. These must be modified by means of the remote control nx-interface. Please note that powering from the grid without battery is not possible. The next3 system cannot operate as a PV inverter without storage. If there is no battery connected, the next3 will not start and shows no indications.
FRONT PANEL LED INDICATOR
The front panel has the necessary information to understand the state of the next3 with the LED lights.

7 3

ON-OFF
2

6
The rack version front panel presents a different look with the same functions: 7
3

5 1
4

2 6

The table hereunder describes the information or type of error according to the number of times an indicator flashes.

Tech user manual next3

Studer Innotec SA next3

N°

Indicator

Central

ne[xt] indicator

(blue light)

Central

indicator

(red light)

AC-Source indicator

AC-Flex as a

source

indicator (genset symbol)

(house symbol is

permanently OFF)

AC-Flex as a load indicator
4b (house symbol) (genset symbol is permanently OFF)

AC-Loads indicator

Battery indicator

Solar indicator

blinking permanently OFF permanently ON
1x
permanently OFF permanently ON
1x
2x
3x
4x permanently OFF permanently ON
1x 2x 3x 4x permanently OFF permanently ON 1x 2x 3x 4x permanently OFF permanently ON 1x 2x permanently OFF permanently ON 1x 2x permanently OFF permanently ON 1x 2x permanently OFF permanently ON 1x 2x 3x

Explanation next3 is OFF next3 is ON next3 has warning(s) or error(s) (please see the nxinterface for details in warning messages) no error, at least one converter in the system is turned on next3 is OFF battery discharge is stopped due to low battery voltage overload due to either a short-circuit or too high load for the inverter decrease of the inverter power output due to a too high internal temperature. This may be due to overload of the device, too high ambient temperature or obstructed ventilation. other error(s) (please see the nx-interface for details in messages) source is deactivated, or not present source is connected and working properly source is present but next3 is in waiting procedure for connection exceeding the source maximum allowed power phases order is incorrect, or one phase is missing source has other warning(s) or error(s) (please see the nx-interface for details) source is deactivated, or not present source is connected and working properly source is present but next3 is in waiting procedure for connection exceeding the source maximum allowed power phases order is incorrect, or one phase is missing AC-Flex has other warning(s) or error(s) (please see the nx-interface for details) loads are not powered loads are properly powered standby / load search mode AC-Flex has other warning(s) or error(s) (please see the nx-interface for details) loads are not powered loads are properly powered standby / load search mode loads have other warning(s) or error(s) (please see the nx-interface for details) battery is disconnected, next3 is not powered up battery works properly battery is almost empty battery has other warning(s) or error(s) (please see the nx-interface for details) solar is deactivated or not present solar is producing properly Night or dawn/dusk no solar production since 48h solar has other warning(s) or error(s) (please see the nx-interface for details)

Tech user manual next3

Studer Innotec SA next3
State of charge indicator: 4 bars in the battery symbol: · 75 to 100 % · 50 to 75 % · 25 to 50 % · 0 to 25 %
In charge mode, the upper LED line inside the battery blinks indicating the charge phase: · 1 time: bulk · 2 times: absorption · 3 times: equalization · permanently on: floating
For lithium batteries with BMS, the upper line never blinks as there are no charging phase controlled by the next3. The charge is controlled by the BMS.
Special cases: · If there is absolutely no light on any of the LEDs, the next is completely without power (battery disconnected) or there is a problem with the display of LEDs. · When powering up the next3 with the battery, all LEDs blink once during the start check. · All LEDs can blink at the same time in an identification procedure (with nx-interface). It is possible to identify the devices in multi-unit system that way:

BEEP INDICATOR (BUZZER)
The sound produced by the next3 buzzer uses the same beep sequence as the central “!” red light flashing sequence.
This buzzer can be deactivated/activated with the nx-interface
This buzzer can also be deactivated/activated with the next button of the front panel. The button must be pushed for 5 seconds < push < 7 seconds (release after the 3rd beep to toggle the function). In any case, the sounds when pressing the button to identify the functions described on chapter 5.2 will remain active.

Tech user manual next3

Studer Innotec SA next3
BEHAVIOR IN PROBLEMATIC CONDITIONS
In operation the next3 protects itself with some programmed behavior
6.1.1 Thermal behaviour
The next3 is rated at 25° ambient temperature with proper ventilation (space around the next3). It has several internal temperature measurements and performs a derating of its functionalities in case of overheating:
· The solar production is reduced from the maximal current of 20A down to 0A to stabilize the temperature at acceptable level.
· The battery charging and discharging current is reduced to stabilize the temperature. · The inverter max power is limited:
o In islanded mode, the power is directly given by the loads. If the max current is reached, the voltage drops because the inverter cannot supply the load. When the voltage goes under a voltage threshold of nominal power -10%, the inverter goes to overload.
A message indicates if the performances are limited by temperature.
6.1.2 Overload
In case of overload the inverter stops.

Tech user manual next3

7 HMI: USE OF NX-INTERFACE

Studer Innotec SA next3

The end-user can interact with the next3 with different interfaces: the remote control nx-interface, on the web monitoring portal and with the APP on a smartphone/tablet. It is also possible to communicate with the next3 with machine to machine via communications through Web API to the portal.and MODBUS.
This chapter describes the use of the nx-interface. This device is a local interface connected to the next with a communication/power cable and allows to:
· Visualize the state of the next3 system, present and past values, including the log of the events that happened to the system.
· Configure the devices: The next3 configuration can be modified by the installer/user at commissioning to adapt the equipment to the energy system in the best possible way. The normal process to configure the next3 is the use of the “Configuration Wizard” at the commissioning. This is a step-by-step procedure that helps you to configure the system in a simple way. This avoid mistakes and is the preferred way to configure the device. Individual settings are also accessible for each part of the next3. The factory values of these settings are reported in the table at the end of this manual.
· Record monitoring data: In order to analyse what happed in the energy system, the nxinterface stores measurements data in its internal memory and on a usb memory stick for later analysis (csv files).
· Be connected: The nx-interface is also the gateway to the outside world. It allows to connect a system to the internet and the Studer monitoring portal. If the nx-interface is connected to the internet, the recorded data can be sent to the Studer web portal user account( https://portal.studer-innotec.com ). The nx-interface is also the gateway to MODBUS communication with third party control systems.
A user level system allows the installer to manage the access rights and the complexity of what is shown to the end user, from “View Only” to “Expert” with the right to modify any settings.

Tech user manual next3

Studer Innotec SA next3
GENERAL NAVIGATION AND USE
The nx-interface a touch screen display. The navigation from one page to another is done by pointing/clicking on an element. The main icons used for navigation are:
Access to main menu. This icon is on every screen and click on it to come back to the top level and navigate quickly Access to settings (level3). There are prepared graphical screens for setting and an access to the whole list of settings with the + symbol from there in EXPERT mode. Access to detailed lists of information (from info screen) or list of settings (from settings screen). The + is accessible only in EXPERT MODE for list access.
ON/OFF of all the functions of the inverter. A confirmation is asked

Back on the previous screen in the menu hierarchy

Enable or mute the beeping of the remote and the inverters.
Page indicator: you can swipe left/right to move to different pages of the same level. For example, when there are many solar chargers in the system, you can navigate from one to another.

Example for the information screen of solar:

Back on upper level (here the synoptic view)

Access to solar list of info

Access to solar settings

Main menu

Swipe to other MPP inputs (here are 20 inputs)

Tech user manual next3

Studer Innotec SA next3

7.1.1 Screens map
The navigation on the nx-interface is organized as given by the picture below. A locked screen appears after some time of inactivity on the nx-interface. It is unlocked with a slide move or with a code. From the locked screen you go back to the last screen that was displayed before entering sleep mode.

Documents / Resources

STUDER NEXT3 Smart Hybrid Inverter Charger With Advanced Interface [pdf] User Guide
2021, 4O9B, V 1.2, NEXT3 Smart Hybrid Inverter Charger With Advanced Interface, NEXT3, Smart Hybrid Inverter Charger With Advanced Interface, Inverter Charger With Advanced Interface, With Advanced Interface, Interface

References

User Manual

STUDER NEXT3 Smart Hybrid Inverter Charger With Advanced Interface User Guide

NEXT3 Smart Hybrid Inverter Charger With Advanced Interface

Specifications:

Product Information:

General Information:

Important Safety Instructions:

Quality and Warranty:

Product Usage Instructions:

FAQ:

Q: Can the next3 charger be used at high altitudes?

Q: What should I do if I need to make modifications to the
system?

Documents / Resources

References

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