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Marstek Energy Co., Limited. 2024. All rights reserved

• Without the written permission of the Company, no unit or individual may extract, copy or disseminate the contents of this document in any form.
• It is prohibited to use part or all of the data contained in the firmware or software developed by Marstek Energy Co., Limited. for commercial purposes in any way.
• Reverse engineering, cracking or any other operation that destroys the original programming design of the software issued by Marstek Energy Co., Limited. is prohibited.

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MARSTEK and other Marstek Energy Co., Limited. trademarks are trademarks of Marstek Energy Co., Limited. All other trademarks or registered trademarks mentioned in this document are the property of their respective owners.

NOTICE

• The products, services or features you purchase shall be subject to the commercial contract and terms of Marstek Energy Co., Limited. All or part of the products, services or features described in this document may not be within the scope of your purchase or use. Unless otherwise agreed in the contract, Marstek Energy Co., Limited. does not make any express or implied representations or warranties in this document.
• Due to product version upgrades or other reasons, the content of this document will be updated from time to time. Unless otherwise agreed, this document is only used as a guide, and all statements, information and suggestions in this document do not constitute any express or implied warranty.

FOR READERS

This document mainly introduces the installation, electrical connection, commissioning, maintenance and troubleshooting methods of the Venus series. Please read this manual carefully before installing and using the AC COUPLED ESS, understand the safety information and be familiar with the functions and features of the AC COUPLED ESS.

This manual is applicable to the Venus series balcony photovoltaic integrated machine. For safety reasons, all installation operations must be and are only allowed to be completed by professional technicians. Professional technicians must have relevant qualifications, receive relevant training, master relevant skills, and strictly follow the instructions contained in this manual.

SYMBOL CONVENTION

The following symbols may appear in this document and their meanings are as follows:

MODIFICATION RECORDS

The revision history accumulates the descriptions of each document update. The latest version of the document contains the updated contents of all previous document versions.

Document version 01 (2024.07.15) Document initial version

Safety Precautions

The Venus series AC COUPLED ESS has been designed and tested according to international safety requirements. However, safety regulations must still be followed when installing and operating this series of AC COUPLED ESS. Installers must carefully read, fully understand and strictly comply with all instructions, precautions and warnings in this installation manual.

It is prohibited to reverse engineer, decompile, disassemble, adapt, implant or other derivative operations on the device software, study the internal implementation logic of the device, obtain the source code of the device software, infringe intellectual property rights in any way, and disclose the results of any device software performance test.

All operations such as transportation, storage, installation, operation, use and maintenance must comply with applicable laws, regulations, standards and specifications.

This equipment should be used in an environment that meets the design specifications. Otherwise, the possible equipment failure, equipment malfunction or component damage is not within the scope of the equipment quality assurance. Otherwise, the company will not be liable for compensation for personal injury, property loss, etc.

The Company shall not be liable for any of the following circumstances or their consequences:

• Equipment damage caused by earthquake, flood, volcanic eruption, mudslide, lightning strike, fire, war, armed conflict, typhoon, hurricane, tornado, extreme weather, or force majeure.
• Not operated within the conditions of use described in this manual.
• The installation and use environment does not comply with relevant international, national or regional standards.
• Unqualified personnel installing and using the equipment.
• Failure to follow the operating instructions and safety warnings in the product and documentation.
• Unauthorized disassembly, modification of the product or modification of the software code.
• Damage caused by transportation by you or a third party you entrust.
• Damage caused by storage conditions not meeting the requirements of product documentation.
• The materials and tools you bring with you do not meet the requirements of local laws, regulations and relevant standards.
• Damage caused by your or a third party's negligence, intent, gross negligence, improper operation or reasons not attributable to the Company.

1.1 Personal Safety

It is strictly forbidden to operate with power on during the installation process. It is forbidden to install or remove cables with power on. When the cable core contacts the conductor, arcs or sparks will be generated, which may cause fire or personal injury.

When the equipment is energized, irregular or incorrect operation may cause fire, electric shock or explosion, resulting in personal injury or property loss.

During operation, it is strictly forbidden to wear watches, bracelets, rings, necklaces and other conductive objects to avoid electric shock and burns.

General requirements

• Do not ignore warnings, cautions, and precautions in the manual and on the equipment.
• During equipment operation, if any fault is found that may cause personal injury or equipment damage, the operation should be stopped immediately, reported to the person in charge and effective protective measures should be taken.
• Do not power on the device before the installation is completed or the device has not been confirmed by a professional.
• It is prohibited to directly touch, use other conductors to touch, or indirectly touch the power supply equipment through wet objects. Before touching any conductor surface or terminal, measure the voltage at the contact point to confirm that there is no risk of electric shock.
• When the device is running, the casing temperature is high and there is a risk of burns, so do not touch it.
• If a fire occurs, evacuate the building or equipment area immediately and press the fire alarm, or call the fire alarm. Under no circumstances is it allowed to re-enter the burning building or equipment area.

Personnel Requirements

• Personnel who operate the equipment include professionals and trained personnel.
• Personnel responsible for installing and maintaining the equipment must first undergo rigorous training, master the correct operating methods, and understand various safety precautions and relevant standards of the country/region where they are located.
• Only qualified professionals or trained personnel are allowed to install, operate and maintain the equipment.
• Only qualified professionals are allowed to remove safety features and repair equipment.
• Personnel involved in special scenarios such as electrical operations, high-altitude operations, and special equipment operations must have special operation qualifications required by the local country/region.

1.2 Electrical safety

Before installation, please check the equipment to make sure that it has not been damaged during transportation. If damaged, the insulation integrity or safety of the equipment may be affected. Please carefully select the installation site and comply with the specified cooling requirements. Unauthorized removal of necessary protective equipment, improper use, improper installation, and improper operation may cause damage to the equipment or even cause serious safety accidents and electric shock.

Before connecting the AC COUPLED ESS to the grid, please contact the local grid operator for approval. All connection operations stated in this manual must be completed by professional technicians who have received relevant training.

Each input of the AC COUPLED ESS is only allowed to connect one photovoltaic module. Do not connect batteries or other power sources. If the installation environment or connected equipment does not meet the technical parameters required by the AC COUPLED ESS, please stop using the AC COUPLED ESS.

If the on-site installation environment does not meet the standard installation conditions, please inform the manufacturer in advance.

If the equipment needs to be repaired, please be sure to use qualified and compliant parts for repair. The relevant parts must be installed by an authorized contractor or an authorized service representative of Marstek Energy Co., Limited. and the relevant parts can only be used for their intended purpose.

After the AC COUPLED ESS is disconnected from the public power grid, some parts of the AC COUPLED ESS may still be energized. Please be careful and beware of electric shock. Before touching the AC COUPLED ESS, please ensure that the surface temperature of the device is safe and the voltage potential of the entire device is within the safe range.

Electrical installation and maintenance work should be completed by qualified electricians, and wiring should comply with local regulations.

• Do not operate the equipment without an installed grounding conductor.
• Do not damage the grounding conductor.
• Please check the terminal screws of the equipment regularly to make sure they are tightened and not loose.
• The grounding impedance of the equipment should meet the requirements of local electrical standards.
• The equipment should be permanently grounded. Before operating the equipment, check the electrical connection of the equipment to ensure that the equipment is reliably grounded.
• Using cables in high temperature environments may cause aging and damage of the insulation layer. The distance between the cables and the heating device or the periphery of the heat source area should be at least 30 mm.
• All cables must be securely connected, well insulated, and of appropriate specifications.
• Cable troughs and wire holes should have no sharp edges, and the cable conduits or wire holes must be protected to prevent the cables from being damaged by sharp edges, burrs, etc.
• When laying the power cord, it is strictly forbidden to make loops or twists. If the power cord is found to be insufficient, it must be replaced. It is strictly forbidden to make joints or welding points in the power cord.
• The selection, installation and routing of cables must comply with local laws, regulations and specifications.

Product Introduction

2.1 Product Model

This article mainly covers the Venus-C and Venus-E product models.

Model Identification

The model of the balcony photovoltaic integrated machine can be viewed on the nameplate on the back of the product.

Nameplate Illustration:

• 1. Product Name
• 2. Model identification
• 3. Important technical parameters
• 4. Certification system logo
• 5. Company name and place of origin
• 6. Barcode and QR code identification

The nameplate illustration is for reference only. The actual product shall prevail.

2.2 Product Description

Function Description

AC COUPLED ESS is an AC-coupled energy storage system, which includes a power control module and a battery energy storage module. It can store and release electric energy according to the requirements of the management system. AC COUPLED ESS is an off-grid and grid-connected all-in-one machine with three working methods: anti-reverse current method, manual method and trade method. It stores electrical energy when grid power is available and supplies power to critical household devices during power outages.

Features

• It supports off-grid and grid-connected operation, with three working methods: anti-reverse current method, manual method, and trade method.
• It allows users to query the total discharge amount information of the product lifecycle in real time.
• The system is plug-and-play and supports both mobile app and integrated management system, enabling remote and local operation.
• Installation is simple and convenient by using standard installation tools.

Grid-connected Applications

The main function of the VENUS series AC COUPLED ESS is to temporarily store grid energy in the battery through a bidirectional inverter. System data is transmitted to the mobile client via a router connection.

Communication method

The VENUS series AC COUPLED ESS adopts WIFI wireless communication to meet the needs of different users, and the connection with APP is simple, fast and stable.

2.3 Box Marking

2.4 Appearance Description

Appearance

Labels: A - Backup, B - GND, C - Switch, D - PSV, E - WIFI, F - RS485, G - Grid

Product Dimensions

Venus-C: 450mm (L) x 200mm (W) x 550mm (H)

Venus-E: 560mm (L) x 200mm (W) x 690mm (H)

2.5 Working Mode

Installation Instructions

3.1 Pre-installation inspection

• Before unpacking the device, check the packaging for visible damage, such as holes, cracks, or other signs of possible internal damage, and check the model number of the device. If there are any abnormalities in the packaging or the energy storage model does not match, do not unpack it and contact your dealer as soon as possible.
• After unpacking the device, check that the delivery items are complete and that there is no visible external damage. If anything is missing or damaged, contact your dealer.

3.2 Select installation location

Support floor installation, installation angle requirements:

• The energy storage device cannot be installed with the device tilted forward, horizontal, inverted, backward or sideways.
• For the installation location, please choose a solid brick-concrete structure, concrete wall and floor. If other types of walls and floors are selected, the walls and floors must be made of flame-retardant materials and meet the load-bearing requirements of the equipment.
• When installing the all-in-one machine, ensure that there are no other equipment (except Venus-related equipment and awnings) and flammable or explosive items around it, and reserve enough space to ensure installation heat dissipation and safety isolation requirements.

Note:

• In the actual installation environment, the open circuit voltage of the photovoltaic module shall not exceed the maximum voltage that the DC input side of the AC COUPLED ESS can withstand. If the DC input voltage of the AC COUPLED ESS exceeds this voltage, the AC COUPLED ESS may be damaged.
• The DC terminals of the AC COUPLED ESS are printed with "+" and "-". This mark does not indicate the positive or negative current, but only the type of terminal. Among them, "+" indicates the male end, and "-" indicates the female end.

3.3 Installing Tools

Installation tools include but are not limited to the recommended tools listed in the table below. Other auxiliary tools may be used as appropriate during on-site installation.

3.4 Equipment Installation

There are two methods for installation: Floor installation and wall-mounted installation.

Step 1: Dimensions

There needs to be at least 150mm of space between the top and rear of the machine to ensure that there are no other devices around and no obstructions to meet the requirements of heat dissipation and safety isolation.

Diagram Description: Shows clearance requirements around the unit.

Step 2: Choose a method for fixed AC COUPLED ESS

1. For floor installation, place component C on the bottom of the AC COUPLED ESS.
2. For wall-mounted installation, component C is not needed. Fix components B and D on the AC COUPLED ESS, and fix component A on the wall. Ensure A and B are tightened.

Diagram Description: Illustrates floor mounting (using C) and wall mounting (using A, B, D).

3.5 Installation And Debugging

Device startup

After connecting the device, short press the power button on the back for 1 second. The power button lights up, and the device enters the power-on state. After a while, the device LED lights up. Normally, the grid and battery status indicator lights are constant.

Indicator Lights: WARN, GRID, BACKUP, BATTERY, CT, WIFI, BT

WIFI Configuration

After the device is started, click the WiFi button on the APP device page to enter the WiFi configuration page. The device will automatically search for nearby WiFi hotspots. Select the desired WiFi hotspot and enter the correct password. After a short wait, the WiFi connection will be completed, and the WiFi button will turn green.

Power generation mode setting

The default power generation mode is automatic. To switch to manual mode, use the switch button on the home page. The available modes are:

• Automatic mode: When the CT connection indicator light is green, the device automatically adjusts grid-connected output power without additional user settings. (Refer to the CT instruction manual for details).
• Manual mode: The user clicks a button to set the grid-connected power according to the date and time period.
• Transaction mode: Users select the local country or region, power company, and set charging/discharging prices.

For more information about power generation modes, please refer to Section 2.5.

Device shutdown

Press and hold the power off button on the back for 3 seconds (or until the button flashes 3 times). The LED light will go out, and the device will enter the power-off state.

Home page display

• Charging and discharging information (charging/discharging power).
• Profit calculation for electricity trading (requires configuring prices).
• Today's discharge amount.
• Battery information (remaining power and percentage).
• WiFi connection status (click to enter configuration).
• Working mode switching button (switch between modes, refer to Section 2.5 for details).

Stop Debugging

4.1 Stop debugging

Disconnect all photovoltaic inputs and AC grid-connected connections. Remove all connecting cables from the AC COUPLED ESS and place it back into its original packaging.

4.2 Storage And Transportation

• Storage temperature: -30°C to 80°C.
• MARSTEK packaging is designed to protect components during transportation. Use correct methods to protect electronic devices from impact, moisture, and vibration.
• Check the condition of parts upon receipt. If packaging or parts are damaged or missing, contact the carrier immediately. For damaged parts, contact the supplier or authorized dealer for repair/replacement.
• Dispose of packaging materials properly to avoid accidental personal injury.

4.3 Disposal

• If the device will not be used immediately or stored for a long time, ensure the packaging is intact.
• For long-term storage, keep the equipment in a well-ventilated indoor area that will not cause damage.
• Restarting equipment that has been out of service for a long time requires a comprehensive inspection.
• Randomly discarding scrapped AC COUPLED ESS may harm the environment. Dispose of according to local regulations.

Troubleshooting

5.1 Troubleshooting Checklist

For the latest checklist, refer to the electronic user manual (scan the QR code on the last page).

Restart method: Put the device into sleep mode, unplug the power connector, wait for 2 minutes, then wake up the device and plug it back in.

5.2 On-site Inspection

For professional technicians:

1. Check if grid voltage and frequency are within specified ranges.
2. Check grid connection and PV input line connection. Confirm PV module voltage is within specified range and equipment is normally connected to the grid.
3. If the problem persists, call technical support.
4. Do not repair without authorization. Contact the local dealer if the fault cannot be eliminated.

5.3 General Maintenance

• Maintenance must be performed by authorized personnel.
• Wear personal protective equipment during maintenance.
• Regularly check environmental conditions to ensure they meet specifications and the equipment is not exposed to severe weather.
• If a problem is found, do not use the device until it is resolved.
• Check components annually to ensure good condition and clear heat dissipation paths.
• Clean the device using a vacuum cleaner or a special brush.

Technical Specifications

* Note 1: Rated voltage/frequency range can be changed according to the requirements of local power department.

* Note 2: Please refer to local electrical regulations to determine the number of the AC COUPLED ESS that can be connected to each branch.

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