Thank You Letter

Thank you for choosing Midea! Before using your new Midea product, please read this manual thoroughly to ensure that you know how to operate the features and functions that your new appliance offers in a safe way.

1. SAFETY PRECAUTIONS

This document describes the assembly, installation, commissioning, maintenance, and failure handling of the energy storage system. Please read it carefully before operating.

Target Group: This document is intended for professional electrical engineers who are responsible for battery installation and commissioning, including technical support engineers, system engineers, and electrical engineers.

Symbols Used: In order to ensure the personal and property safety of users when using this product, as well as the efficient use of this product, the manual provides relevant safe operation information and highlights it with corresponding symbols. These stressed messages must be fully understood and absolutely adhered to avoid personal injury and property damage.

• DANGER: Indicates a hazardous situation which, if not avoided, will result in death or serious injury.
• WARNING: Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
• CAUTION: Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• ATTENTION: Indicates there are potential risks, if fail to prevent, may lead to equipment malfunction or property damage.
• NOTE: Provides additional information and tips that are valuable for the optimal operation of the product, helping to solve a problem or save time.

Faulty operation may cause serious injury or death.

1.1 Requirement for Installation and Maintenance

• The installation of the energy storage system must be in full compliance with national and local laws and regulations.
• Read and understand all instructions contained in this manual and familiarize yourself with safety symbols before installing and commissioning the device.
• For any maintenance or repair, please contact the nearest authorized repair center. Do not repair by yourself, which may cause personal injury or property damage.
• Before installing and maintaining the device, disconnect the device from external devices using the DC switch. Otherwise, high voltage may cause serious injury.

Installation and Maintenance Personnel Requirements

• Only qualified professionals or trained personnel are allowed to install, operate, and maintain the device.
• Only qualified professionals are allowed to remove safety facilities and repair devices.
• Personnel operating the equipment should have special operation qualifications required by the local state, such as high voltage operation, height climbing, and special equipment operation.
• Only professional or authorized personnel can replace equipment or components (including software).

NOTE:

• Professional personnel: Those who have training or operation experience of equipment and are able to understand potential hazards during installation, operation, and maintenance.
• Trained personnel: Personnel who have received appropriate technical training and have necessary experience, are aware of risks, and can take measures to minimize them.
• Operators: Personnel who may have access to the equipment except trained and professional personnel.

1.2 Description of Safety Information Symbols

• DANGER: High voltage of the product may be harmful to health! Only certified engineers can operate the product; Juveniles, disabled persons should not use this product; Keep this product out of the reach of children.
• ATTENTION: The product should be grounded in accordance with the requirements of the local electrical grid company.

Sings on the Product

The product carries a number of safety-related labels. Make sure to read and understand the labels carefully before installing the device.

2. PRODUCT INTRODUCTION

2.1 System Introduction

The energy storage system is mainly composed of an energy storage module and a bidirectional DC/DC unit. The input and output voltages are high DC voltage. The system adopts a modular design and stacked installation method. The capacity can be flexibly configured based on actual requirements. The capacity range is one stack of 5-20kWh, up to 2 stacks in parallel. Battery system monitoring is achieved via communication with the inverter through RS485. The inverter connects to the network via Wi-Fi, enabling monitoring through the web portal and/or app.

Figure 2-1: Energy storage system application principle diagram illustrates the flow of energy from PV panels to the inverter, then to the bidirectional DC/DC unit and battery modules, and finally to the grid or load.

2.2 Product Appearance

System Appearance

Front Surface: Features indicators labeled RUN, COM, and state-of-charge indicators (25%, 50%, 75%, 100%). It also shows components numbered 1 through 7.

Back Surface: Shows components numbered 1 through 6.

Component Identification (System):

• 1: Base
• 2: Energy storage module
• 3: Bidirectional DC/DC unit
• 4: Side cover
• 5: LED indicator
• 6: DC switch
• 7: Heat sink

Bidirectional DC/DC Unit Appearance

Front Surface: Features indicators labeled RUN, COM, and state-of-charge indicators (25%, 50%, 75%, 100%). It also shows components numbered 1 through 12.

Component Identification (Bidirectional DC/DC Unit):

• 1: Bidirectional DC/DC unit
• 2: Energy storage module (This seems misplaced in the original text, likely referring to a connection point or part of the system)
• 3: Input communications port
• 4: BAT cascading terminal (B+)
• 5: BAT output terminal (BAT-)
• 6: DC switch
• 7: Grounding hole
• 8: BAT output terminal (BAT+)
• 9: BAT cascading terminal (B-)
• 10: Output communications port
• 11: Black startup switch
• 12: Grounding hole

Energy Storage Module Appearance

Front Surface: Features indicators labeled RUN, COM, and state-of-charge indicators (25%, 50%, 75%, 100%). It also shows components numbered 1 through 10.

Left Surface: Shows components numbered 1 through 5.

Right Surface: Shows components numbered 6 through 10.

Component Identification (Energy Storage Module):

• 1: Energy storage module
• 2: BAT cascading terminal (B-)
• 3: BAT cascading terminal (B+)
• 4: Output communications port
• 5: Input Communications port
• 6: Grounding hole
• 7: Side handle
• 8: BAT cascading terminal (B-)
• 9: BAT cascading terminal (B+)
• 10: Grounding hole

2.3 Indicator Lights Description

The system uses LED indicators for RUN, COM, and State of Charge (25%, 50%, 75%, 100%).

2.4 System Capacity Expansion Description

The energy storage system supports capacity expansion. Up to four battery modules are managed by one power module. The expandable capacity of a single-cluster battery system ranges from 5kWh to 20kWh.

Visual representation shows how adding more energy storage modules increases the total system capacity from 5kWh to 10kWh, 15kWh, and 20kWh.

3. PRODUCT INSTALLATION

Announcements

• Do not install batteries on flammable materials or in places where flammable or explosive materials are stored.
• CAUTION: The enclosures and fins are very hot when the bidirectional DC/DC unit is operated, so do not install energy storage systems where you may inadvertently come into contact with them.
• ATTENTION: Consider the weight of the energy storage module when transporting and moving it. Select a suitable mounting position and surface. At least two persons are required to install energy storage modules.

NOTE: Before installation, the Battery Management System (BMS) enters sleep mode, and all battery terminals remain de-energized. The battery is exclusively activated by the bidirectional DC/DC unit. During the installation process, the terminals of the battery module remain in a de-energized state.

3.1 Checking Before Installation

Checking Outer Packing Materials

Packing materials and parts can be damaged in transit. Check the packing materials of the product before installation. If any damage is found (e.g., holes, cracks), do not open the package and contact the distributor as soon as possible. It is recommended to remove packing materials within 24 hours before installation.

Checking Packing List

After unpacking the energy storage modules and bidirectional DC/DC unit, check if the packaging and accessories are intact. If any damage is found or any components are missing, contact the distributor.

3.2 Preparation for Installation Tools

Prepare tools for installation and electrical connections.

3.3 Installation Environment

Before installation, determine the proper position for installing the energy storage system. The following requirements must be met:

• Choose a dry, clean, neat, and convenient location for installation.
• Ambient temperature: -20°C to 55°C; recommended temperature: -10°C to 50°C.
• Relative humidity: 5%-95% (non-condensing).
• The product should be placed in a well-ventilated place.
• There are no inflammable and explosive objects near the installation position of the product.
• The highest altitude of the installation environment is 2000m.

NOTE:

• The operation and service life of the battery depend on the operating temperature. Install the battery at a temperature equal to the ambient temperature or in a better environment.
• The operating temperature of the battery system ranges from -20°C to +55°C. If the battery system is installed in a cold environment, the built-in thermal control system starts to heat the battery to achieve better performance. The heating process consumes rechargeable power, which reduces the system energy efficiency in cold weather.
• If the battery system is stored in a cold environment (e.g., 0°C) before installation, the battery system needs some time (< 2 h) to heat up before it can be charged. It is advised to place the battery system in a warm place before installation to facilitate commissioning.

3.4 Installation Space

To ensure sufficient space for installation and heat dissipation, reserve enough space around the energy storage system. The requirements are as follows:

Visual representation shows required clearances around the unit.

3.5 Energy Storage System Installation

Step 1: Base installation

Install the four foot cups under the base. Align the base with the wall, ensuring it is 77mm~92mm away from the wall surface. Adjust the four foot cups of the base until it is level.

Figure 3-1: Base installation diagram shows the base positioned away from the wall with foot cups adjusted for leveling.

Step 2: Installing the energy storage modules and bidirectional DC/DC unit

Align the first energy storage module on the base, install the connectors on both sides, and tighten the 8 screws on both sides. Install the remaining energy storage modules and bidirectional DC/DC unit from bottom to top.

Figure 3-5: Installing the energy storage and bidirectional DC/DC unit diagram illustrates the stacking order: Base (1), Energy storage module (2), Bidirectional DC/DC unit (3).

Step 3: Installing expansion bolts

Determine the drilling position according to the fixed position of the Anti-tip bracket and mark the positions using a marker. Then, drill holes and install expansion bolts.

NOTE: The expansion bolts delivered with the battery are mainly used for solid concrete walls. If other types of walls are used, ensure that the walls meet the load-bearing requirements (one energy storage module weighs 52kg) and select the bolts yourself.

Figure 3-6: Marking the tracing position shows marking holes for the anti-tip bracket.

Figure 3-7: Expansion bolts installation shows the process of installing expansion bolts.

Figure 3-4: M6 expansion bolt structure diagram illustrates the components of an expansion bolt: Bolt, Nut, Spring washer, Flat washer, Expansion sleeve.

Step 4: Anti-tip bracket installation

Secure the bidirectional DC/DC unit to the wall using the anti-tip bracket.

WARNING: The bidirectional DC/DC unit must be fixed on the wall.

Figure 3-6: Installing the Anti-tip bracket diagram shows the bracket being attached to secure the unit.

4. ELECTRICAL CONNECTION

This product is used for battery energy storage PV systems. Equipment can be damaged if not used as intended.

ATTENTION: Only professional electrical engineers can install and maintain batteries. When making electrical connections, wear rubber gloves and protective clothing. When connecting the device electrically, you must first connect the protection ground cable. When removing a device, ensure that the PGND cable is removed at last.

DANGER: Before electrical connection, ensure that the DC switch of the bidirectional DC/DC unit is OFF, the running status LED is OFF, and the energy storage module has no output voltage.

NOTE: Equipment damage caused by operator's wrong wiring is not covered by the product warranty.

4.1 WIRING CONNECTION

Step 1: Protection grounding cable connection

Connect the ground points of modules in sequence and secure the ground cable using a ground screw.

DANGER:

• Connect cables in accordance with local installation laws and regulations.
• Before connecting cables, ensure that the DC switch on the battery and all switches connected to the battery are set to OFF. Otherwise, the high voltage of the battery may result in electric shocks.
• For safety consideration, it is suggested that a reliable lock be used to lock the switch. When the switch is in OFF gear, turn the switch counterclockwise to approximately 15° to the end and push the slide button towards the screw to lock the switch. The DC switch padlock needs to be prepared by the customer. Select a padlock based on the lock hole diameter (6 mm) to ensure that the padlock can be installed smoothly.

Visual shows the DC switch in Australia with padlock location.

NOTE: After installation, the DC switch of the bidirectional DC/DC unit can physically disconnect the DC/DC unit from the inverter, thus eliminating the risk of external electric shock through dual-pole isolation.

Step 2: Installing internal DC terminals

Insert the positive and negative connectors delivered with the battery into the positive and negative battery cascading terminals (B+ and B-).

Step 3: Connecting internal communication cables

Connect communication cables between the bidirectional DC/DC unit (COM0) and energy storage modules (COM1).

Step 4: External electrical connection

Connect the bidirectional DC/DC unit COM Terminal to the inverter BMS port for communication between the inverter and the energy storage system. The following is an example of the storage inverter connection.

Visual shows connections for BAT+, BAT-, and COM ports between the unit and an inverter.

Connection of a grounding cable

1. Remove the insulation of the cable. For outside use, cables of 4mm² are recommended for grounding.
2. Crimp the cable to the ring terminal.
3. Install the crimped ring terminal and the washer with M4 screws and tighten these with a torque of 1.5 Nm using an Allen key.

Cascading Batteries (Optional)

Battery Cascading Cable Connection

Visual shows connections for signal cable and DC input cable for cascading.

Connecting Cascading DC Input Power Cables (Cascading)

Use Y connectors to connect the DC input terminals (BAT+ and BAT-) between the power control module and the inverter.

Connecting a Signal Cable

Prepare a signal cable terminal for connecting the power control module.

Step 5: Install the protective cover

After electrical connections are complete and cable connections are correct and reliable, install the external protective cover.

• Assemble the base protective cover and battery protective cover together.
• Install protective covers on both sides of the energy storage module and the battery module.
• Tap the corners of the protective cover to ensure it is in place before locking the screws. The edge with 3 protruding points faces up.

Visuals show the assembly and installation of protective covers.

5. COMMISSIONING

5.1 Double Check

Please double check the following items before running:

• Energy storage, bidirectional DC/DC unit, and the base should be completely fixed.
• Each BAT+/BAT- line is firmly connected, the polarity is correct, and the voltage is in line with the accessible range.
• The DC switch of the bidirectional DC/DC unit is OFF, and the running status LED indicator is OFF.
• Ensure that the communication cable is firmly connected to the terminal resistor.
• Install sealing plugs on unused terminals or interfaces.
• Cable is arranged reasonably, and the cable is tidy and without damage.

5.2 Electrify for the First Time and Start up

Make sure the device you wish to connect to is powered on. Please follow these instructions carefully to perform the four power-on steps:

1. Power on the batteries: Turn the DC switch on the bidirectional DC/DC unit to ON, then press and hold the start button for 5 seconds.
2. Turn the PV switch between the inverter and the PV panels to ON.
3. Turn the AC switch between the inverter and the grid to ON. Observe the "COM" LED indicator on the bidirectional DC/DC unit is lighted, "DC" and "AC" LED indicators on the inverter are lighted.
4. Start Operation: After powering on the system, turn on the EMS by tapping "Maintenance" in the goMslar App and turning on the "EMS on/off" switch. Confirm the startup begins.

5.3 System Power Off

Power Off Inverter and Bidirectional DC/DC Unit

1. Turn the PV switch between the inverter and the PV panels to OFF.
2. Turn the AC switch between the inverter and the grid to OFF.
3. Turn the DC switch on the bidirectional DC/DC unit to OFF.

Battery Power Off

The battery will automatically power off within 3 minutes after system power-off (when the DC switch on the bidirectional DC/DC unit is set to OFF), or by pressing the black start button on the bidirectional DC/DC unit for 30 seconds. All LED indicators on the bidirectional DC/DC unit turn off. After the system has been powered off for five minutes, ensure all residual energy in the battery is discharged before performing maintenance.

5.4 Black Start up (general)

NOTE: When the battery SOC is 0%, the battery cannot be activated by holding the black start button. The battery can be started only after both the DC and AC power supplies are connected. It is recommended that the battery be charged to 50% SOC. Long-term storage will cause capacity loss; after a lithium battery is stored for 12 months in the recommended storage temperature, the irreversible capacity loss rate is 3%-10%.

1. Connect power cables and communications cables correctly.
2. Turn the DC switch on the bidirectional DC/DC unit to ON.
3. Turn the AC switch between the inverter and the grid to ON.
4. Turn the PV switch between the inverter and the PV panels to ON.
5. Hold down the black start button for about 4s to activate the battery. The running status LED indicator turns and keeps green. The battery comprehensive LED shows the battery SOC value. Once any LED above is lighted, release the button.
6. Hold down the black start button again for about 5s and release to start the system.
7. Confirm the start-up begins by blinking of any battery comprehensive LED.

NOTE: If the black start-up fails, the running status LED indicator turns and keeps red. Follow the next steps:

1. Turn the AC switch between the inverter and the grid to OFF.
2. Turn the PV switch between the inverter and the PV panels to OFF.
3. Turn the DC switch on the battery power module to OFF.
4. Hold down the black start button for about 34s to deactivate the battery. Once all LED indicators on the bidirectional DC/DC unit turn dark, release the button.
5. Turn to follow step 1 to step 7.

6. TROUBLE SHOOTING AND MAINTENANCE

6.1 Troubleshooting

This section describes potential errors for this product. Please read the following tips carefully when troubleshooting:

Alarm severities are defined as follows:

• Major: The inverter is faulty. As a result, the output power decreases or the grid-tied power generation is stopped.
• Minor: Some components are faulty without affecting the grid-tied power generation.

6.2 Daily Maintenance of the System

To ensure that the battery can operate properly for a long term, it is advised to perform routine maintenance as described in this chapter.

ATTENTION: Before cleaning the system, connecting cables, and ensuring grounding reliability, power off the system.

6.3 Battery Module Storage Requirements and Power Supply

Battery Module Storage Requirements

• Environment temperature: -10°C to 45°C
• Recommended storage temperature: 20°C to 30°C
• Storage relative humidity range: 5% to 80%.
• Store in a dry, clean, and ventilated environment, away from direct sunlight.
• When storing the battery module, place it correctly. Do not put the battery module upside down or on its side.
• If the energy storage module is stored for a long time, replenish the power supply periodically.

Recharge Requirements during Normal Storage

When the battery is stored for a long time, regular maintenance is needed. If the storage time is close to that shown in the following table, arrange supplementary power supply in time.

7. TECHNICAL PARAMETERS

System Parameters

Bidirectional DC/DC Unit

Energy Storage Module

Standard

Certificates: IEC/EN 62109-1, EN 61000-6-1, EN 61000-6-3, IEC62619, UN38.3, IEC/EN 62040-1

¹ Test conditions: 100% depth of discharge (DoD), 0.2C rate charge & discharge at 25°C, at the beginning of life.

² The weight of the battery module is subject to the actual product, with a tolerance of ±3%.

³ Refer to battery warranty letter for conditional application.

⁴ Please follow the user manual during the installation, use, and maintenance of the storage system.

8. TRADEMARKS, COPYRIGHTS AND LEGAL STATEMENT

Midea logo, word marks, trade name, trade dress, and all versions thereof are valuable assets of Midea Group and/or its affiliates ("Midea"), to which Midea owns trademarks, copyrights, and other intellectual property rights, and all goodwill derived from using any part of a Midea trademark. Use of Midea trademark for commercial purposes without the prior written consent of Midea may constitute trademark infringement or unfair competition in violation of relevant laws.

This manual is created by Midea, and Midea reserves all copyrights thereof. No entity or individual may use, duplicate, modify, distribute in whole or in part this manual, or bundle or sell with other products without the prior written consent of Midea.

All described functions and instructions were up to date at the time of printing this manual. However, the actual product may vary due to improved functions and designs.

9. DISPOSAL AND RECYCLING

Important instructions for environment (European Disposal Guidelines)

Compliance with the WEEE Directive and Disposing of the Waste Product: This product complies with the EU WEEE Directive. This product bears a classification symbol for waste electrical and electronic equipment (WEEE). This symbol indicates that this product shall not be disposed of with other household wastes at the end of its service life. Used devices must be returned to an official collection point for recycling of electrical electronic devices. To find these collection systems, please contact your local authorities or retailer where the product was purchased. Each household performs an important role in recovering and recycling old appliances. Appropriate disposal of used appliances helps prevent potential negative consequences for the environment and human health.

10. DATA PROTECTION NOTICE

For the provision of the services agreed with the customer, Midea agrees to comply without restriction with all stipulations of applicable data protection law, in line with agreed countries within which services to the customer will be delivered, as well as, where applicable, the EU General Data Protection Regulation (GDPR). Generally, Midea's data processing is to fulfill its obligation under contract with you and for product safety reasons, to safeguard your rights in connection with warranty and product registration questions. In some cases, but only if appropriate data protection is ensured, personal data might be transferred to recipients located outside of the European Economic Area. Further information is provided on request. You can contact Midea's Data Protection Officer via MideaDPO@midea.com. To exercise your rights, such as the right to object to your personal data being processed for direct marketing purposes, please contact us via MideaDPO@midea.com. To find further information, please follow the [QR Code].

The design and specifications are subject to change without prior notice for product improvement. Consult with the sales agency or manufacturer for details. Any updates to the manual will be uploaded to the service website; please check for the latest version.