sunways STT 4-25KTL Grid Connected Inverter User Manual

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1 STT 4-25KTL Grid Connected Inverter

2 Documents / Resources

2.1 References

3 Related Posts

STT 4-25KTL Grid Connected Inverter

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AU
User Manual
Grid-connected Inverter
STT 4~25KTL
S U N W A Y S T E C H N O L O G I E S C O . , LT D .

CONTENTS

1 Preface ……………………………………………………… 5
1.1 Overview ………………………………………………………………………… 5 1.2 Target Groups …………………………………………………………………… 5
2 Safety Instructions ……………………………………… 6
2.1 Safety Notes ……………………………………………………………………… 6 2.2 Statement ………………………………………………………………………… 6 2.3 Important Safety Matters ……………………………………………………… 7 2.4 Symbols Explanation…………………………………………………………… 8
3 Product Description ……………………………………… 11
3.1 Basic Features ………………………………………………………………… 11 3.2 Physical Layout ……………………………………………………………… 12 3.3 Display Interface ……………………………………………………………… 14 3.4 Packing List …………………………………………………………………… 15
4 Installation ………………………………………………… 18
4.1 Location ……………………………………………………………………… 18 4.2 Mounting ……………………………………………………………………… 20 4.3 External ground connection ……………………………………………… 23 4.4 Electrical Connection ……………………………………………………… 24 4.5 Monitoring Device Installation …………………………………………… 31 4.6 Meter/RS485/DRED Connection …………………………………………… 32
5 Start and Stop ……………………………………………… 36
5.1 Start the Inverter …………………………………………………………… 36 5.2 Stop the Inverter……………………………………………………………… 36
6 General Operation ………………………………………… 37
6.1 Display Operation …………………………………………………………… 37 6.2 Country Code (Safety Code) Setting ……………………………………… 38 6.3 AC Output Boost for STT-15KTL(-P) Inverter …………………………… 39 6.4 Power Quality Response Modes …………………………………………… 40 6.5 Grid Protection settings …………………………………………………… 41 6.7 Power rate limit setting……………………………………………………… 42 6.8 Export Limit and Generation Limit………………………………………… 43 6.9 Online Monitoring APP ……………………………………………………… 45
7 Troubleshooting…………………………………………… 46
7.1 Error Message ………………………………………………………………… 46 7.2 PV System for Ground Faults ……………………………………………… 50 7.3 Maintenance ………………………………………………………………… 50
8 Technical Parameters …………………………………… 51

Attention
Attention
The products, services or features purchased are subject to the commercial contracts and terms of Sunways technologies Co., Ltd. All or part of the products, services or features described in this document may not be within purchased. Unless otherwise agreed in the contract, the Company shall not make any express or implied declaration or guarantee of the contents of this document. Due to product version upgrades or other reasons, the contents of this document will be updated periodically. Unless otherwise agreed, this document serves only as a guide to use, and all statements, information and recommendations in this document do not constitute any express or implied guarantee.

1 Preface
1 Preface
1.1 Overview This manual is an integral part of Sunways STT 4-25kW series three-phase inverters (hereinafter referred to as the inverter). It mainly introduces the assembly, installation, electrical connection, maintenance and troubleshooting of the products. Before installing and using the inverter, please read this manual carefully, understand the safety information and be familiar with the functions and characteristics of the inverter.
1.2 Target Groups This manual is applicable to the electrical installers with professional qualifications and end-users. If there are any problems in the installation process, please call Sunways service telephone at +86 400-9922-958 or email Sunways at service@sunways-tech.com for consultation.

2 Safety Instructions
2 Safety Instructions
2.1 Safety Notes Before installation, please read this manual carefully and follow the instructions in this manual strictly. Installers need to undergo professional training or obtain electrical related professional qualification certificates. When installing, do not open the front cover of the inverter. Apart from performing work at the wiring terminal (as instructed in this manual), touching or changing components without authorization may cause injury to people, damage to inverters and annulment of the warranty. All electrical installations must conform to local electrical safety standards. If the inverter needs maintenance, please contact the local designated personnel for system installation and maintenance. To use this grid-connected inverter for power generation needs the permission of the local power supply authority. The temperature of some parts of the inverter may exceed 60° C during operation. To avoid being burnt do not touch the inverter during operation. Let it cool before touching it. When exposed to sunlight, the PV array generates dangerous high DC voltage. Please operate according to our instructions, or it will result in danger to life. The product is to be installed in a high traffic area where the fault is likely to be seen.
2.2 Statement Sunways Technologies Co.,Ltd. has the right not to undertake quality assurance in any of the following circumstances: Damages caused by improper transportation. Damages caused by incorrect storage, installation or use.
6

2 Safety Instructions
Damages caused by installation and use of equipment by non-professionals or untrained personnel. Damages caused by failure to comply with the instructions and safety warnings in this document. Damages of running in an environment that does not meet the requirements stated in this document. Damages caused by operation beyond the parameters specified in applicable technical specifications. Damages caused by unauthorized disassembly, alteration of products or modification of software codes. Damages caused by abnormal natural environment (force majeure, such as lightning, earthquake, fire, storm, etc.). Any damages caused by the process of installation and operation which don’t follow the local standards and regulations. Products beyond the warranty period.
2.3 Important Safety Matters Table below shows the symbols that may appear in this document and their definition:

Danger

Dangerous situation, if not avoided, it could result in death or serious personal injury.

Warning

Potentially dangerous situation, if not avoided, may result in death or serious personal injury.

Caution

Potentially dangerous situation, if not avoided, may result in moderate or minor personal injury.

2 Safety Instructions

Attention

The safety warning information about equipment or environment, to prevent equipment damage, data loss, equipment performance degradation or other unpredictable results.

Note

Symbol highlights important information, best practices and tips, etc.

2.4 Symbols Explanation This chapter mainly elaborates the symbols displayed on the inverter, nameplate and packing box.
2.4.1 Symbols on the Inverter

Inverter status indicator.

Inverter running indicator.

Grounding symbol, the inverter casing needs to be properly grounded.

2 Safety Instructions 2.4.2 Symbol on the Inverter nameplate
The inverter cannot be disposed of with household waste. Please read the instructions carefully before installation. Do not touch any internal parts of the inverter until 5 min after being disconnected from the mains and PV input. CE mark, the inverter complies with the requirements of the applicable CE guidelines. TUV certification. Danger. Risk of electric shock! The surface is hot during operation and no touch is allowed.
9

2 Safety Instructions
Electric shock hazard, live parts, risk of electric shock, do not touch.
2.4.3 Symbol on the Packing box Handle with care. This side up. Keep dry. Stacked layers.
10

3 Product Description

3.1 Basic Features
3.1.1 Function The Sunways STT 4-25kW series inverter is a three-phase grid-connected PV inverter which used to efficiently convert the DC power generated by the PV string Into AC power and feed it into the grid.
3.1.2 Models The STT 4-25kW series inverter includes 20 models which are listed below: STT-4KTL, STT-5KTL, STT-6KTL, STT-8KTL, STT-10KTL, STT-12KTL, STT-15KTL, STT-17KTL, STT-20KTL, STT-25KTL STT-4KTL-P, STT-5KTL-P, STT-6KTL-P, STT-8KTL-P, STT-10KTL-P, STT-12KTL-P, STT-15KTL-P, STT-17KTL-P, STT-20KTL-P, STT-25KTL-P
3.1.3 Applicable grid type The applicable grid types for the Sunways STT 4-25kW series are TN-S, TN-C, TN-C-S, IT and TT. When applied to the TT grid, the voltage of N to PE should be less than 30V.For more details please see Figure3-1:

TN-S Transformer

TN-C Transformer

TN-C-S Transformer

Sunways STT Series
TT Transformer

Sunways STT Series

Sunways STT Series
IT Transformer

Sunways STT Series

Figure 3-1 Applicable grid types

3 Product Description

3.1.4 Storage conditions Inverter must be stored in its original packaging. The storage temperature and humidity should be in the range of -30 and+ 60 , and less than 90%, respectively. If a batch of inverters needs to be stored, the height of each pile should be no more than 6 levels.

3.2 Physical Layout 3.2.1 Inverter front view

550mm

Logo

410mm

Display
Figure 3-2 Front view 3.2.2 Inverter side view
175mm

3.2.3 Inverter Bottom View

3 Product Description

COM1

COM2-1 COM2-2

175mm

DC Switch

Back Rail

Com2 Port (Optional)

DC Input Terminal

Com1 Port

AC Output Terminal

Figure 3-4 Bottom view

Wiring terminals are at the bottom of the inverter, as shown in the table below.

Item
1 2 3 4

Terminal
DC Input terminal COM 1 Port COM 2 Port
AC Output Terminal

Note
PV connector WiFi/LAN/GPRS/4G device connector
RS485/DRED connector Used for AC output cable connection

3.2.4 Inverter back view

Back Rail

410mm

Name Plate
Figure 3-3 Side view 12

Vent Valve
Figure 3-5 Inverter back view 13

3 Product Description 3.3 Display Interface

sunways

Figure 3-6 Display interface

Item Indicator

Status

Description

Off

No input voltage detected or input voltage is too low.

Slow flashing Inverter powered on, waiting for the grid connection. Power 1 Indicator
Quick flashing Inverter detected grid power and entered self-test status.

Normal, grid-connected and power generated.

An alarm or faults detected, specific fault information can be On
viewed from the display.

Off

The inverter is running normally.

Alarm

Indicator

The monitoring device is not connected to the router or is not

Slow flashing

connected to internet.

Quick flashing

The monitoring device is connected to the router or connected to internet but not connected to the server.

3 Product Description

Item Indicator

Status

Description

OLED

Display

Display the inverter operating information.

If the button pressed without any response, the screen is faulty or Off
not well connected.

Switch OLED display information and set parameters by short

Button

Physical button

press and long press.

3.4 Packing List The package of the inverter includes the following accessories. Please check whether the accessories in the packing box are complete when receiving the goods. See Figure 3-7 for the packing list.

Inverter×1

Wall Bracket×1

Expansion Bolt×5

3Pin Terminal×1

3 Product Description PV Terminal×2

Monitoring Device×1(Optional)

AC Terminal×1

Ground Terminal×1

3 Product Description

Note

Export limitation & control version 2pcs; RS485 and DRED version 1 pcs (This connector already pre-installed inside the inverter). STT 4-12kW 2pcs / STT 15kW 3pcs / STT 17-25kW 4pcs.
DRED version only (This connector already pre-installed inside the inverter).

6Pin Terminal×1

User Guide

User Manual

Quick Guide
Inspection Report

Figure 3-7 Packing list

4 Installation
4 Installation
4.1 Location The Sunways STT 4-25kW series inverters designed with IP65 protection enclosure for indoor and outdoor installations. When selecting an inverter installation location, the following factors should be considered: The wall on which the inverters mounted must be able to withstand the weight of the inverter. The inverter needs to be installed in a well-ventilated environment. Do not expose the inverter directly to strong sunlight to prevent excessive temperature operation. The inverter should be installed in a place with shelter to prevent direct exposure to sunlight and rain. Install the inverter at eye level for easy inspection of screen data and further maintenance. The ambient temperature of the inverter installation location should be between -30 and 60 . The surface temperature of the inverter may reach up to 75 . To avoid risk of burns, do not touch the inverter while it’s operating and inverter must be installed out of reaching of children.
4.1.1 Installation location Recommended installation location of the inverter, as shown in Figure 4-1:

4 Installation

Warning

Do not put flammable and explosive articles around the inverter.

4.1.2 Installation Spacing The requirements for inverter installation spacing are shown in Figure 4-2:

500mm

300mm

500mm

Figure 4-2 Recommended installation spacing
4.1.3 Installation Angle The installation angle of the inverter is recommended as shown in Figure 4-3:

Figure 4-1 Recommended installation location 18

Figure 4-3 Recommended installation angle 19

4 Installation
4.2 Mounting 4.2.1 Wall bracket installation
Dimensions of wall bracket, see Figure 4-4:
300mm

150mm

150mm
Figure 4-4 Dimensions of wall bracket Use the wall bracket as the template to mark the position of 5 holes on the wall. See Figure 4-5 for details:

4 Installation
Bracket assembly Prepare the two M5 screws and L-shaped plate in the accessory bag, then fix the L-shaped plate to the mounting bracket.

Figure 4-6 Bracket assembly Use an electrical driller with 10mm diameter bit to drill 5 holes in the wall with 80mm depth.

Warning

Before drilling, make sure to avoid any buried water tube and electric wires in the wall.

Insert the expansion tubes into the holes and tighten them, then fix the bracket onto the wall with expansion screws by using a cross screwdriver, as shown in Figure 4-7:

Figure 4-5 Marking hole position using installation bracket 20

Figure 4-7 Fixing the wall bracket 21

4 Installation 4.2.2 Mounting the inverter Lift the inverter, hang the back rail on the fixed wall bracket carefully. Screws the inverter to the L-shaped plate (The lock is purchased separately). See Figure 4-8 for details:
Figure 4-8 Mounting the inverter

4.3 External ground connection

4 Installation

Danger Attention

Do not connect the N-wire as a protective ground wire to the inverter casing. Otherwise, it may cause electric shock.
Good grounding is good for resisting surge voltage shock and improving EMI performance. Inverters must be well-grounded. For a system with only one inverter, the PE cable needs to be grounded. For a multi-inverter system, all inverters PE wires need to be connected to the same grounding copper bar to ensure equipotential bonding.

Ground terminal connection steps: The external grounding terminal is located in the lower right side of the inverter. Fix the grounding terminal to the PE wire with a proper tool and lock the grounding terminal to the grounding hole in the lower right side of the inverter, as shown in Figure 4-9. The cross-sectional area of the external grounding cable is 4mm2.

Figure 4-9 Grounding terminal connectio

4 Installation

4.4 Electrical Connection

Danger

A high voltage in the conductive part of the inverter may cause an electric shock. When installing the inverter, make sure that the AC and DC sides of the inverter are completely de-energized.

Warning

Do not ground the positive or negative pole of the PV string, otherwise it will cause serious damage to the inverter.

Warning Attention

Static may cause damage to the electronic components of the inverter. Anti- static measures should be taken during installation and maintenance.
Do not use other brands or other types of terminals other than the terminals in the accessory package. Sunways has the right to refuse all damages caused by the mixeduse of terminals.

Attention

Moisture and dust can damage the inverter, ensure the cable gland is securely tightened during installation. The warranty claim will be invalidated if the inverter is damaged as a result of a poorly connected cable connector.

4.4.1 Inverter PV string connection
1. The following must be considered when making electrical connections to the inverter: Disconnect the AC breaker switch on the grid side. The DC switch of the inverter must be turned to the “OFF” position. For best practice, ensure PV modules of the same model and specifications are connected in each string. Make sure the maximum output voltage of each PV string does not exceed 600V.

4 Installation
2.DC connector assembly procedure Select the appropriate photovoltaic cable:

Cable type

General photovoltaic cable

Range (mm2) 2.5-4.0

Traverse area (mm²) Recommended value (mm2) 4.0

Peel off the DC cable insulation sleeve for 7 mm, as shown in Figure 4-10:
Wire Traverse area 2.5-4mm2 7mm

Figure 4-10 Disassemble the connector in the accessory bag, as shown in Figure 4-11:
+
–
Figure 4-11 Insert the DC cable through the DC connector nut into the metal terminal and press the terminal with a professional crimping plier (pull back the cable with some power to check if the terminal is well connected to the cable), as shown in Figure 4-12:
25

4 Installation

Crimping Plier

Figure 4-12
Insert the positive and negative cables into the corresponding positive and negative connectors, pull back the DC cable to ensure that the terminal is tightly attached in the connector. Use an open-end wrench to screw the nut to the end to ensure that the terminal is well sealed, as shown in Figure 4-13:
Open-end Wrench

Figure 4-13

Warning

Before assembling the DC connector, make sure that the cable polarity is correct.
Use a multimeter to measure the voltage of the DC input string, verify the polarity of the DC input cable, and ensure that each string voltage is within 1000V.

3. Insert the positive and negative connectors into the inverter DC input terminals respectively, a click sound should be heard if the terminals are well connected, as shown in Figure 4-14:

4 Installation

COM2-1

COM1

COM2-2

Figure 4-14
4. Seal the unused PV terminals with the terminal caps.
4.4.2 Connection of AC output
Before connecting to the power grid, make sure that the power grid voltage and frequency meet the requirements of the inverter. See technical parameters for details. All Sunways inverters incorporate internal RCD (Residual Current Device) to protect against possible electrocution in case of a malfunction of the PV array, cables or inverter (DC). The RCD in the Sunways inverter can detect leakage on the DC side. An external RCD is required in some countries. The installer must check which type of RCD is required by the specific local electric codes. Installation of an RCD must always be conducted in accordance with local codes and standards. Sunways recommends the use of a type-A RCD, with a tripping current of 300mA or higher. The recommended cable and AC switch for the Sunways STT 4-25kW series three phase inverter are shown in the following table:

Model STT-4K STT-5K STT-6K STT-8K STT-10K STT-12K STT-15K STT-17K STT-20K STT-25K

Coper Cable

2.5-10 mm2

4-10 mm2

6-10 mm2

8-10 mm2

Breaker 20A

20A

32A

40A

50A

4 Installation

Warning

An AC breaker must be connected on the AC side of the inverter. Any loads cannot be connected to the inverter without the AC breaker.

1. AC connector connection steps Take the AC connector out of the accessory bag and disassemble it, as shown in Figure 4-15:

4 Installation

Wire Diameter:13-18mm

St r i p Lengt h:8mm 50mm

Cable Gland

Threaded Sleeve

AC Terminal Head

Figure 4-16 Insert the stripped end of the five wires into the appropriate hole of the terminal head by following the rules: yellow green wire to PE port, red or brown fire wires to L ports (no requests for the sequence of three fire wires), and blue or black wire to the N port. Please try to pull out the cable to make sure it is well connected. As shown in Figure 4-17:

Figure 4-15
According to the table above, select an appropriate cable, peel the insulation sleeve of AC cable off for 50mm, and peel off the end of 3L /PE / N wires for 8mm, as shown in Figure 4-16: 28

Allen Key
Figure 4-17 29

4 Installation
According to the arrow direction push the threaded sleeve to make it connected with the AC terminal head and then rotate the cable gland clockwise to lock it, as shown in figure 4-18:

4 Installation
4.5 Monitoring Device Installation Sunways STT 4-25kW series three phase inverter supports WIFI, GPRS, LAN, 4G and RS485 communication. Plug the WIFI, LAN, 4G or GPRS module into the COM1 port in the bottom of inverter (as shown in Figure 4-20). A slight “click” sound during the installation represents that the assembly is in place.

Figure 4-18 2. Connect the AC connector to the inverter AC terminal, and rotate the AC connector buckle clockwise until its tight enough. As shown in figure 4-19:
Figure 4-19 Connect the AC connector 30

COM2-1
COM2-2
COM1

COM2-1 COM2-2

Figure 4-20 Monitoring device installation

Note Attention

1. The 4G and GPRS version module does not need to be configured. 2. The WiFi version module needs to be configured to the router for the first installation. If the router name or password are changed, the WiFi dongle will need to be reconfigured. For details, please refer to the [QUICK INSTALLATION GUIDE] which is attached to the accessory bag. 3. If DHCP is enabled on the router, the LAN version module does not need to be configured. Otherwise, please refer to the [QUICK INSTALLATION GUIDE] which is attached to the accessory bag.
Do not touch the waterproof plug in the card slot except for replacing the SIM card. In that case, please make sure the card slot is completely sealed by the weatherproof plug after replacing the SIM card. Any damages caused by improper waterproof plug placement, will void warranty.

4 Installation
4.6 Meter/RS485/DRED Connection
4.6.1 Terminals definition Inverter communication ports are located at the behind of the COM2 plate at the bottom and include RS485 port (used for Meter or Datalogger connection), and DRED port, as shown in Figure 4-21:

Port 1
1 2 3

Port 2
1 2 3

COM2-1

3 Port 3 4
COM2-2
5

Figure 4-21

Note

Port 1

Port 2

Port3

Meter Port

RS485 Port

DRED Port

This port is available on export limitation & control, RS485 and DRED versions of the inverter only. The Pin connector in inverter Port1 and Port2 may vary from 2Pin to 3pin according to the shipment version.

4 Installation

Different versions of the inverter have different terminals, which are defined as follows:

Port

Function

NO.

Only Export limitation & control

version with this port.

Connect external Meter (with 3CTs)

Port1

to activate the Export Limitation &

control function on Sunways STT

series inverter.

Export limitation & control/RS485/

DRED version with this port.

Port 2

ln case of multiple inverters, all the

inverters can be daisy-chained via

RS485 cables.

1 Only DRED version with this port.

DRED means demand response

enable device. The AS/NZS 4777.2:2020

requires inverters to support demand

response mode (DRM). This function

Port 3

is for inverters that comply with AS/ NZS4777.2:2020 standard.

Sunways inverter is fully compliant

with all DRM. The 6pin connector is

used for DRM connection.

Support DRM command: DRM0,

DRM5, DRM6, DRM7, DRM8. 6

Definition RS485 A RS485 B PE/NULL RS485 A RS485 B PE/NULL
COM/DRM0 REFGEN DRM4/8 DRM3/7 DRM2/6 DRM1/5

4.6.2 RS485 Communication STT series three-phase inverter supports multiple inverters daisy-chain connection to a data logger via RS485 communication. Multiple inverters connection diagram as shown in Figure 4-22:
33

4 Installation

Data logger
LAN/WiFi /GPRS

STT 4~25KTL STT 4~25KTL series inverter series inverter

STT 4~25KTL series inverter

…

RS485

Router

Internet

Internet Sunways server

Figure 4-22 The maximum distance between the inverter at the end of the daisy chain and the Data logger should be within 1000m.

Attention

It is recommended to use the RS485 communication cable with a cross sectional area of 0.75-1.5mm and an outer diameter of 5mm-10mm. RS485 cable2 requirements: Shielded twisted-pair cable or shielded twisted Ethernet cable.

4.6.3 Export limitation & control or generation limit solution Any further difficulties in export limitation & control or generation limit solution, wiring instructions and configuration, please contact Sunways after-sales at service@sunwaystech.com.
4.6.4 Wiring Steps: Remove the COM2 plate in the bottom of the inverter with a cross screwdriver. Put the cable through the connector and connect to the terminal in the following order: screw cap, sealing ring, insulator, metal plate, nut and 3/6pin connector, as shown in Figure 4-23:
34

4 Installation

Insulator ring Nut

213 Port 1
231 Port 2 135246 Port 3

Screw cap

Metal plate

Sealing ring

3/6pin connector

20-25mm
6mm 20-25mm
6mm

Figure 4-23
Insert the cable to the port in the 3/6pin connector and fasten with a screwdriver. Insert the 3/6pin connector into the 3/6pin connecter inside the inverter, and screw the COM2 plate back with a cross screwdriver, as shown in Figure 4-24:

COM2-1
COM2-1
Figure 4-24 35

5 Start and Stop
5 Start and Stop
5.1 Start the Inverter When starting the inverter, follow these steps: Turn on the AC breaker first (close the AC circuit breaker). Turn on the DC switch in the bottom. If the PV string voltage higher than the inverter start-up voltage, the inverter will start. When both AC and DC power supply are normal, the inverter is ready to start. The inverter will initiate checking its internal parameters and grid parameters, if it is within the range, the green light on the left side of the screen begins to flash, and the “Waiting” message will be displayed on the OLED display. After self-checking completed, the inverter will start generating electricity, the green light will remain on, and the OLED display will display real-time power information.
5.2 Stop the Inverter When turning off the inverter, please follow the steps below: Turn off the AC breaker first. Wait 30 seconds and then turn the DC switch to the “OFF” position. At this time, there is remaining power in the inverter capacitor. Wait for 5 minutes until the inverter is completely de-energized before conducting any work on the inverter. Disconnect the AC and DC cables.
36

6 General Operation
6 General Operation
6.1 Display Operation When the inverter is turned on, the following interfaces will be displayed on the OLED display, and the OLED display allows the user to check various operation information and to modify the settings of the inverter. Please refer to the following display operation flow for details: 6.1.1 Main Window and General Setting

Waiting

Main Window Checking Normal

Fault info

Firmware Updating

Grid Voltage Grid Current
Grid Freq
Modbus Addr
Setting Time Set

PV Voltage PV Current

E-Day

E-Total

Not WiFi/LAN

LAN setting

WIFI setting

H-Total RSSI

Language Set

Export Limit On/Off XXX%

Power Rate Limit
XXX%Pn/min

Model Name
Fault Info
Error Message
Generation Limit XXX%

General Settings

Advanvced Settings

System Info
SN/FM Version

Setting

ReConnect

CT Ratio

Grid Connect Type Set

Power Factor

Feed in Grid

Export Limit

Safety Set

Setting

Sys CtrlMode

OverLoad (AU)

Power Rate Limit

Generation Limit

Setting

Short press(1s), switch window Long press(3s), enter the lower menu

6 General Operation

6.1.2 LAN/WIFI Setting

LAN Reset

DHCP Set

IP Address

DHCP ON

Gateway Address

Subnet Mask

DNS Address

Setting

WIFI Reset

WIFI Reload

Setting

Note

Please wait for 10 seconds and the inverter will automatically save your settings or modifications.

6.2 Country Code (Safety Code) Setting Please set “Country code (Safety code)” under the menu “Safety Set” in “Advanced Settings”.
Please follow this flow chart to set “Country code (Safety code)”: The country grid code and region settings are password protected. User should be able to view but not edit the country codes. If you are installer, please contact importer for password. You can also call Sunways service telephone at +86 400-9922-958 or email Sunways at service@ sunways-tech.com for password.

Main Window

Advanced Settings

Password

Verified OK

Safety Set

Short press(1s), switch window Long press(3s), enter the lower menu

Setting

6 General Operation

Note

For compliance with AS/NZS 4777.2:2020, please select from Region A/B/C New Zealand. Please contact your local grid operator for which region to select.

How to view
Main Window

General Settings

Safety Code

Short press(1s), switch window Long press(3s), enter the lower menu

6.3 AC Output Boost for STT-15KTL(-P) Inverter
The maxium output power of the residencial three-phase solar system is 15kVA in most of the states in Australia. Check the local DNSPs or authorities if they allow AC output more than 15kVA .

Note

Advanced settings can only be changed by qualified professionals with relevant certfications. Check requirements with local NSP before activating 10% AC output boost. Only STT-15KTL(-P) has the option to enable/disable the 10% AC output boost. The default password to access the advanced settings is 1111,applicable to all on-grid inverters.

Please follow this flow chart to enable 10% AC output boost:

Short press(1s), switch window Long press(3s), enter the lower menu
39

6 General Operation
6.4 Power Quality Response Modes Through the host computer software, set the ON/OFF state of the power quality response mode to enable/disable this function. The default for this function in Australia is the ON state. User have access to view the power quality response moude status in Sunways Portal APP. Please refer to bellow steps.

How to View Steps In Sunways Portal APP

Device Management

Device List
Power Control
Grid Parameters

…
Parameter Settings

6.4.1 Power derating for voltage variation (Volt-Watt mode) This mode can be enabled via the configuration software.It is enabled by default in some regions, such as AU market. For information on how to change default setpoints please contact Sunways Technical Support at service@sunways-tech.com.
6.4.2 Reactive power regulation for voltage variation (Volt-VAr mode) This mode can be enabled via the configuration software.It is enabled by default in some regions, such as AU market. For information on how to change default setpoints please contact Sunways Technical Support at service@sunways-tech.com.
6.4.3 Reactive power mode This mode can be enabled via the configuration software.It is enabled by default in some regions, such as AU market. For information on how to change default setpoints please contact Sunways Technical Support at service@sunways-tech.com.

6 General Operation
6.5 Grid Protection settings This mode can be enabled via the configuration software.It is enabled by default in some regions, such as AU market. For information on how to change default setpoints please contact Sunways Technical Support at service@sunways-tech.com. User have access to view the grid protection status in Sunways Portal APP. Please refer to bellow steps.

How to View Steps In Sunways Portal APP

Device Management

Device List
Protection Parameters

…
Parameter Settings

6.6 Fixed power factor setting Please set “Power Factor” under the menu “Power Factor” in “Advanced Settings”. Please follow this flow chart to set”Power Factor”: The “Power Factor” settings are password protected. User should be able to view but not edit. If you are installer, please contact importer for password. If there are any problems in the installation process, please call Sunways service telephone at +86400-9922-958 or email Sunways at service@sunways-tech.com for consultation.

Main Window

Advanvced Settings

Password

Verified OK

Setting OK
Short press(1s), switch window Long press(3s), enter the lower menu

Power Factor
Setting

6 General Operation
6.7 Power rate limit setting Please set “Power rate limit ” under the menu “Power rate limit” in “Advanced Settings”. Please follow this flow chart to set”Power rate limit”: The “Power rate limit ” settings are password protected. User should be able to view but not edit. If you are installer, please contact importer for password. If there are any problems in the installation process, please call Sunways service telephone at +864009922-958 or email Sunways at service@sunways-tech.com for consultation. Enable the Power rate limit function by short pressing or long pressing the button on the inverter screen. Set the percentage of the power that allowed to ramp up, when set to XXX%Pn/min, it means that the maximum power allowed to ramp up is XXX%Pn/min of the inverter’s rated output power.

How to view
Main Window

General Settings

Power Rate Limit XXX%Pn/min

Short press(1s), switch window Long press(3s), enter the lower menu

How to setup
Main Window

Advanced Settings

Password

Verified OK

Power Rate Limit

Short press(1s), switch window Long press(3s), enter the lower menu

Setting

6 General Operation
6.8 Export Limit and Generation Limit 6.8.1 Export limit fuction setting
Sunways inverter’s Export Limit function can be enable if export limit is requried by local. Please set “Export Limit” under the menu “Export Limit” in “Advanced Settings”. Please follow this flow chart to set”Export Limit”: The “Export Limit” settings are password protected. User should be able to view but not edit the Export Limit. If you are installer, please contact importer for password. If there are any problems in the installation process, please call Sunways service telephone at +86400-9922-958 or email Sunways at service@sunways-tech.com for consultation. Enable the Export Limit function by short pressing or long pressing the button on the inverter screen. Set the percentage of the power that allowed to feed into grid, when set to XXX%,it means that the maximum power allowed to feed into grid is XXX% of the inverter’s rated output power. If you need Zero Export , set the percentage to 0%.

How to view
Main Window

General Settings

Generation Limit XXX%

Short press(1s), switch window Long press(3s), enter the lower menu

6 General Operation

How to setup
Main Window

Advanced Settings

Password

Verified OK

Export Limit

Feed in Grid

Short press(1s), switch window Long press(3s), enter the lower menu

On/Off

Setting

6.8.2 Generation limit setting
Sunways inverter’s Export Limit function can be enable if export limit is requried by local. Please set “Generation Limit ” under the menu “Generation Limit” in “Advanced Settings”. Please follow this flow chart to set”Generation Limit”: The “Generation Limit” settings are password protected. User should be able to view but not edit the Generation Limit. If you are installer, please contact importer for password. If there are any problems in the installation process, please call Sunways service telephone at +86400-9922-958 or email Sunways at service@sunways-tech.com for consultation. Enable the Generation Limit function by short pressing or long pressing the button on the inverter screen. Set the percentage of the power that allowed to output , when set to XXX%,it means that the maximum AC output power of inverter is XXX% of the inverter’s rated output power. If you need Zero output , set the percentage to 0%.

How to view
Main Window

General Settings

Generation Limit XXX%

Short press(1s), switch window Long press(3s), enter the lower menu

6 General Operation

How to setup
Main Window

Advanced Settings

Password 1111

Verified OK

Generation Limit

Short press(1s), switch window Long press(3s), enter the lower menu

Setting

6..8.3 Soft export and hard export switch
During “Export Limit” setting and “Generation Limit” setting, the “Soft Export” mode and “Hard Export” mode can be switched in “Sys CtrlMode”. Please follow this flow chart to switch the “Soft Export” mode” and “Hard Export”mode. This settings are password protected. User should be able to view but not edit. If you are installer, please contact importer for password. If there are any problems in the installation process, please call Sunways service telephone at +86400-9922-958 or email Sunways at service@sunways-tech.com for password.

Main Window

Advanced Settings

Password

Verified OK

Sys CntlMode

Soft Export

Short press(1s), switch window Long press(3s), enter the lower menu

Hard Export

6.9 Online Monitoring APP Sunways inverter provides a monitoring port that can collect and transmit data from the inverter to Sunways monitoring platform via an external monitoring device. Please refer to the product nameplate on side of enclosure to get the monitoring application. If download issues exist , contact your dealer or Sunways technical support.
45

7 Troubleshooting

7 Troubleshooting
7.1 Error Message Sunways STT 4-25kW series three phase inverter is designed in accordance with grid operation standards, and conform to the requirements of safety and EMC. The inverter had passed a series of rigorous tests to ensure it runs sustainably and reliably before shipment. When a fault occurs, the corresponding error message will be shown on the OLED display, and in this case, the inverter might stop feeding into grid. The fault messages and their corresponding troubleshooting methods are listed below:

Error Message

Description

Troubleshooting

No Display

Check whether cables are all firmly connected and DC switch is on. Check whether the input voltage meets the working voltage.

Mains Lost

Grid power outage, AC switch or circuit is disconnected.

Check whether the mains supply is lost. Check whether the AC breaker and terminals are well connected.

Grid Voltage Fault

Grid overvoltage or undervoltage, the grid voltage is higher or lower than the set protection value.

Check whether the safety regulation setting is correct. Check the voltage of the grid. If the grid voltage exceeds the allowed range of inverter protection parameters, please contact the local grid company to resolve. Check whether the impendence of the AC cable is too high. Replace with a thicker AC cable if that is the case.

7 Troubleshooting

Error Message

Description

Troubleshooting

Grid Frequency Fault

Grid over frequency or underfrequency, the grid frequency is higher or lower than the set protection value.

Check whether the safety regulation settings are correct. Check the frequency of the grid. If the grid frequency exceeds the allowed range of inverter protection parameters, please contact the local grid company to resolve.

ISO Over Limitation

Low system insulation resistance, which is generally caused by poor insulation to ground of the module/cable or by rainy and damp environment.

Check whether the PV panels, cables, and connectors are broken or water leaked. Check whether there is a reliable inverter grounding line.

GFCI Fault

Excessive leakage current.

The ground current is too high. Check whether the PV cable has a short circuit to ground.

PV Over Voltage

PV over voltage is too high.

Input voltage is too high. Reduce the number of PV panels to make sure the open-circuit voltage of each string is lower than the inverter max allowed input voltage.

Inverter Over Temperature

Temperature anomaly, the temperature of the interior of the inverter is excessively high and out of the safe range.

Check whether the inverter is directly exposed to the sunlight. Reduce ambient temperature.

DCI Fault

DC Injection Hight. Inverter detects a higher DC component in AC output.

Restart the inverter, wait a moment for inverter recovery. If the fault occurs repeatedly, please contact Sunways.

7 Troubleshooting

Error Message

Description

Bus Voltage Fault BUS voltage is over-high.

Troubleshooting
Restart the inverter, wait a moment for inverter recovery. If the fault occurs repeatedly, please contact Sunways.

SCI Fault

Internal communication fails. Caused by a strong external magnetic field etc.

Restart the inverter, wait a moment for inverter recovery. If the fault occurs repeatedly, please contact Sunways.

SPI Fault

Internal communication fails. Caused by a strong external magnetic field etc.

Restart the inverter, wait a moment for inverter recovery. If the fault occurs repeatedly, please contact Sunways.

E2 Fault

Internal storage anomaly. Caused by a strong external magnetic field etc.

Restart the inverter, wait a moment for inverter recovery. If the fault occurs repeatedly, please contact Sunways.

GFCI Device Fault GFCI device anomaly.

Restart the inverter, wait a moment for inverter recovery. If the fault occurs repeatedly, please contact Sunways.

AC Transducer Fault AC transducer anomaly.
48

Restart the inverter, wait a moment for inverter recovery. If the fault occurs repeatedly, please contact Sunways.

7 Troubleshooting

Error Message

Description

Troubleshooting

Relay Check Fail

Self-checking of relay fails. neutral & ground cable are not connected well on AC side or just occasional failure.

Check use multi-meter if there is high voltage (normally should be lower than 10V) between N&PE cable on AC side. If the voltage higher than 10V, it means the Neutral & ground cable are not connected well on AC side or restart inverter. If the neutral & ground cable are connected well, please contact Sunways.

Flash Fault

Internal storage anomaly. Caused by a strong external magnetic field etc.

Restart the inverter, wait a moment for inverter recovery. If the fault occurs repeatedly, please contact Sunways.

External Fan Fault External fan anomaly.

Stop the inverter and disconnect the AC&DC cables. Check whether the fan is blocked by foreign matters. If not, replace the fan.

Internal Fan Fault Internal fan anomaly.

Restart the inverter, wait a moment for inverter recovery. If the fault occurs repeatedly, please contact Sunways.

7 Troubleshooting

7.2 PV System for Ground Faults If ground fault occurs, the inverter will beep, the red LED will light up and the Error Message “GFCI Fault” will be displayed in the Results menu on the inverter user interface. At the same time, the Sunways monitoring system will also issue an alarm.

7.3 Maintenance

Danger

Risk of inverter damage or personal injury due to incorrect service! Always keep in mind that the inverter is powered by dual sources: PV strings and utility grid. Before any service work, observe the following procedure. Disconnect the AC circuit breaker and then set the DC load-break switch of the inverter to OFF; Wait at least 5 minutes for inner capacitors to discharge completely; Verify that there is no voltage or current before pulling any connector.

Caution Attention

Keep non-qualified persons away! A temporary warning sign or barrier must be posted to keep non-qualified persons away while performing electrical connection and service work.
Restart the inverter only after removing the fault that impairs safety performance. Never arbitrarily replace any internal components. For any maintenance support, please contact Sunways. Otherwise, Sunways shall not be held liable for any damage caused.

Note

Servicing of the device in accordance with the manual should never be undertaken in the absence of proper tools, test equipment or the latest revision of the manual which has been clearly and thoroughly understood.

Items

Methods

System clean

Check the temperature and dust of the inverter. Clean the inverter enclosure if necessary. Check if the air inlet and outlet are normal. Clean the air inlet and outlet if necessary.

Period
Six months to a year (it depends on the dust contents in air.)

8 Technical Parameters

Model
Start-up Voltage (V) Max. DC Input Voltage (V) Rated DC Input Voltage (V) MPPT Voltage Range (V)
No. of MPP Trackers No. of DC Inputs per MPPT
Max. Input Current (A) Max. Short-circuit Current (A) backfeed current to the array (A)
Rated Output Power (W) Max. Output Power (W) AC output rated apparent power(VA) Max. Apparent Power (VA) Rated Output Voltage (V) Rated AC Frequency (Hz) AC output rated currentA Max. Output Current (A) The measured Inrush current (A) maximum output fault current (A) maximum output overcurrent protection (A)
Power Factor Max. total harmonic distortion
DCI

STT-4KTL STT-4KTL-P STT-5KTL

Input

200

180

200

1,100

620

200-950

160-1000

200-950

1/1

11/11

15/15

11/11

15/15

20/20

15/15

Output

4,000

5,000

4,400

5,500

4,000

5,000

4,400

5,500

3 / N / PE230 / 400V

50/60

6.7

8.4

6.7

8.4

7A@4.4ms

0.8 leading …0.8 lagging

< 3% @Rated Output Power

< 0.5%In

STT-5KTL-P
180 1,100 620 160-1000
2 1/1 15/15 20/20 0
5,000 5,500 5,000 5,500
50/60 8.4 8.4
7A@4.4ms 33 33

8 Technical Parameters

Model
Max. Efficiency European Efficiency
MPPT Efficiency
DC Reverse Polarity Protection Insulation Resistance Protection
Surge Protection Over-temperature Protection Residual Current Protection
Islanding protection AC Short-circuit Protection AC Over-voltage Protection
Dimensions (mm) Weight (kg)
Protection Degree Self-consumption at Night (W)
Topology Operating Temperature Range (° C)
Relative Humidity (%) Operating Altitude (m)
Cooling Noise Level (dB)
Display Communication
Compliance

STT-4KTL STT-4KTL-P

Efficiency

98.1%

STT-5KTL 98.1%

STT-5KTL-P 98.1%

97.9% 99.9%
Protection

97.9% 99.9%

Integrated Integrated

97.9% 99.9%

Integrated Integrated

Integrated Frequency shift, Integrated
Integrated

Integrated

General Data

550W*410H*175D

IP65

< 1 Transformerless

-30~60 0~100 3000

Natural Convection

< 25

OLED & LED OLED & LED OLED & LED OLED & LED RS485WiFi/ GPRS/LAN(Optional)

NB/T32004IEC62109IEC62116VDE4105VDE0126 UTE C15-712-1AS4777C10/11CEI0-21RD1699NBR16149
IEC61727IEC60068IEC61683EN50549EN61000

8 Technical Parameters

STT-6KTL STT-6KTL-P Input

STT-8KTL

200

180

200

1,100

620

200-950

160-1000

200-950

1/1

11/11

15/15

11/11

15/15

20/20

15/15

Output

6,000

8,000

6,600

8,800

6,000

8,000

6,600

8,800

3 / N / PE230 / 400V

50/60

13.3

7A@4.4ms

0.8 leading …0.8 lagging

< 3% @Rated Output Power

< 0.5%In

STT-8KTL-P
180 1,100 620 160-1000
2 1/1 15/15 20/20 0
8,000 8,800 8,000 8,800
50/60 13.3 13.3 7A@4.4ms 33 33

8 Technical Parameters

STT-6KTL STT-6KTL-P STT-8KTL STT-8KTL-P

Efficiency

98.3%

98.0%

99.9%

Protection

Integrated

Frequency shift, Integrated

Integrated

General Data

550W*410H*175D

IP65

< 1

Transformerless

-30~60

0~100

3000

Natural Convection

<25

OLED & LED OLED & LED OLED & LED OLED & LED

RS485WiFi/ GPRS/LAN(Optional)

NB/T32004IEC62109IEC62116VDE4105VDE0126 UTE C15-712-1AS4777C10/11CEI0-21RD1699NBR16149
IEC61727IEC60068IEC61683EN50549EN61000

8 Technical Parameters

Model

STT-10KTL STT-10KTL-P Input

STT-12KTL

STT-12KTL-P

Start-up Voltage (V)

200

180

200

180

Max. DC Input Voltage (V)

1,100

Rated DC Input Voltage (V)

620

MPPT Voltage Range (V)

200-950

160-1000

200-950

160-1000

No. of MPP Trackers

No. of DC Inputs per MPPT

1/1

Max. Input Current (A)

11/11

15/15

11/11

15/15

Max. Short-circuit Current (A)

15/15

20/20

15/15

20/20

backfeed current to the array (A)

Output

Rated Output Power (W)

10,000

12,000

Max. Output Power (W)

11,000

13,200

AC output rated apparent power(VA)

10,000

12,000

Max. Apparent Power (VA)

11,000

13,200

Rated Output Voltage (V)

3 / N / PE230 / 400V

Rated AC Frequency (Hz)

50/60

AC output rated currentA

16.5

Max. Output Current (A)

16.5

The measured Inrush current (A)

7A@4.4ms

7A@4ms

maximum output fault current (A)

maximum output overcurrent protection (A)

Power Factor

0.8 leading …0.8 lagging

Max. total harmonic distortion

< 3% @Rated Output Power

DCI

< 0.5%In

8 Technical Parameters

STT-10KTL STT-10KTL-P STT-12KTL STT-12KTL-P

Efficiency

98.6%

98.2%

99.9%

Protection

Integrated

Frequency shift, Integrated

Integrated

General Data

550W*410H*175D

IP65

< 1

Transformerless

-30~60

0~100

3000

Natural Convection

< 25

OLED & LED OLED & LED OLED & LED OLED & LED

RS485WiFi/ GPRS/LAN(Optional)

NB/T32004IEC62109IEC62116VDE4105VDE0126 UTE C15-712-1AS4777C10/11CEI0-21RD1699NBR16149
IEC61727IEC60068IEC61683EN50549EN61000

8 Technical Parameters

Model

STT-15KTL STT-15KTL-P Input

STT-17KTL

STT-17KTL-P

Start-up Voltage (V)

200

180

200

180

Max. DC Input Voltage (V)

1,100

Rated DC Input Voltage (V)

620

MPPT Voltage Range (V)

200-950

160-1000

200-950

160-1000

No. of MPP Trackers

No. of DC Inputs per MPPT

1/2

2/2

Max. Input Current (A)

11/22

15/30

22/22

30/30

Max. Short-circuit Current (A)

15/30

20/40

30/30

40/40

backfeed current to the array (A)

Output

Rated Output Power (W)

15,000

17,000

Max. Output Power (W)

16,500

18,700

AC output rated apparent power(VA)

15,000

17,000

Max. Apparent Power (VA)

16,500

18,700

Rated Output Voltage (V)

3 / N / PE230 / 400V

Rated AC Frequency (Hz)

50/60

AC output rated currentA

28.4

Max. Output Current (A)

28.4

The measured Inrush current (A)

7A@4ms

maximum output fault current (A)

maximum output overcurrent protection (A)

Power Factor

0.8 leading …0.8 lagging

Max. total harmonic distortion

< 3% @Rated Output Power

DCI

< 0.5%In

8 Technical Parameters

STT-15KTL STT-15KTL-P STT-17KTL STT-17KTL-P

Efficiency

98.6%

98.2%

99.9%

Protection

Integrated

Frequency shift, Integrated

Integrated

General Data

550W*410H*175D

IP65

< 1

Transformerless

-30~60

0~100

3000

Natural Convection

Fan Cooling

< 25

<40

OLED & LED OLED & LED OLED & LED OLED & LED

RS485WiFi/ GPRS/LAN(Optional)

NB/T32004IEC62109IEC62116VDE4105VDE0126 UTE C15-712-1AS4777C10/11CEI0-21RD1699NBR16149
IEC61727IEC60068IEC61683EN50549EN61000

8 Technical Parameters

Model

STT-20KTL STT-20KTL-P Input

STT-25KTL

STT-25KTL-P

Start-up Voltage (V)

200

180

200

180

Max. DC Input Voltage (V)

1,100

Rated DC Input Voltage (V)

620

MPPT Voltage Range (V)

200-950

160-1000

200-950

160-1000

No. of MPP Trackers

No. of DC Inputs per MPPT

2/2

Max. Input Current (A)

22/22

30/30

22/22

30/30

Max. Short-circuit Current (A)

30/30

40/40

30/30

40/40

backfeed current to the array (A)

Output

Rated Output Power (W)

20,000

25,000

Max. Output Power (W)

22,000

25,000

AC output rated apparent power(VA)

20,000

25,000

Max. Apparent Power (VA)

22,000

25,000

Rated Output Voltage (V)

3 / N / PE230 / 400V

Rated AC Frequency (Hz)

50/60

AC output rated currentA

31.9

Max. Output Current (A)

31.9

The measured Inrush current (A)

8.5A@4ms

maximum output fault current (A)

maximum output overcurrent protection (A)

Power Factor

0.8 leading …0.8 lagging

Max. total harmonic distortion

< 3% @Rated Output Power

DCI

< 0.5%In

8 Technical Parameters

STT-20KTL STT-20KTL-P STT-25KTL STT-25KTL-P

Efficiency

98.6%

98.2%

99.9%

Protection

Integrated

Frequency shift, Integrated

Integrated

General Data

550W*410H*175D

IP65

< 1

Transformerless

-30~60

0~100

3000

Fan Cooling

<40

OLED & LED OLED & LED OLED & LED OLED & LED

RS485WiFi/ GPRS/LAN(Optional)

NB/T32004IEC62109IEC62116VDE4105VDE0126 UTE C15-712-1AS4777C10/11CEI0-21RD1699NBR16149
IEC61727IEC60068IEC61683EN50549EN61000

S11-00030-01

No. 1, Second Road, Green Industrial Zone, Chongshou Town, Cixi City, ZheJiang Province, PRC www.sunways-tech.com service@sunways-tech.com

Documents / Resources

sunways STT 4-25KTL Grid Connected Inverter [pdf] User Manual
STT 4 25KTL Grid Connected Inverter, STT 4 25KTL, Grid Connected Inverter, Connected Inverter

References

User Manual

STT 4-25KTL Grid Connected Inverter

Documents / Resources

References

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