Tewaycell 51.2V 16KWh Powerwall 314Ah LiFePO4 Battery Pack User Manual

1. Product Overview

The Tewaycell 51.2V 16KWh Powerwall is a high-capacity LiFePO4 (Lithium Iron Phosphate) battery pack designed for household energy storage. It features a built-in 200A Battery Management System (BMS) and offers a long cycle life of 6000+ cycles. This manual provides essential information for the safe and efficient use of your Powerwall.

Figure 1: Tewaycell 51.2V 16KWh Powerwall with dimensions and key features.

2. Safety Warnings

WARNING: This product contains Lithium carbonate, a chemical known to the State of California to cause developmental toxicity. For more information go to www.P65Warnings.ca.gov

Please mind potential fire risk and strictly follow the instruction manual for charging and storage. For disposal, please check your local authority's website for more information and dispose of the lithium-ion battery safely in accordance with the applicable legal requirements.

• Do not immerse the battery in water or allow it to get wet.
• Do not use or store the battery where it is exposed to extremely high temperatures.
• Do not use the battery in strong electrostatic and magnetic fields, as this may compromise battery safety.
• Do not reverse the positive (+) and negative (-) terminals; prevent reverse connection.
• Charge with the specified charger according to charging requirements.
• Ensure proper connection between the inverter and MPPT.

3. Setup and Installation

3.1. Unpacking and Inspection

Carefully unpack the Powerwall and inspect for any visible damage. Ensure all components listed in the packing list are present.

Figure 2: Included accessories: fit screws, parallel power cable, and inverter cable for RS485/CAN/RS232.

3.2. Physical Placement

The Powerwall is designed with wheels for easy mobility. Place the unit on a stable, level surface in a well-ventilated area, away from direct sunlight, heat sources, and flammable materials. Ensure adequate clearance for ventilation and access to ports.

Figure 3: Product dimensions and features including handles, wheels, and display panel.

3.3. Electrical Connections

The Powerwall is designed for integration into a household energy storage system. It supports connection with various inverters. Refer to the schematic diagrams for proper wiring.

Figure 4: General schematic diagram of Powerwall connection within a home energy system.

Figure 5: Detailed view of the Powerwall's control panel and communication ports.

3.3.1. Parallel Connections

The Powerwall supports up to 16 parallel connections for increased capacity. When connecting multiple units in parallel, ensure that the cables used for high current discharge are appropriately rated (e.g., to support 200A current).

Figure 6: Example of multiple Powerwall units connected in parallel.

3.4. Inverter Compatibility

The Tewaycell Powerwall is compatible with a range of inverters. Always verify compatibility with your specific inverter model before connection. Compatible brands include:

• GROWATT
• Deye
• GOODWE
• VICTRON
• SOFAR
• SRNE
• VOLTRONIC POWER

Figure 7: Logos of various compatible inverter brands.

4. Operating Instructions

4.1. Built-in Battery Management System (BMS)

The Powerwall features an advanced 200A BMS for optimal battery performance and safety. The BMS provides:

• Overcharge Protection
• Overdischarge Protection
• Power Display
• Temperature Monitoring (NTC)
• Automatic Battery Balancing
• Current Protection

Figure 8: Key features of the built-in Battery Management System (BMS).

4.2. Controls and Indicators

The Powerwall is equipped with an Air Switch, an Active Balance Switch, and a Fire Protection Device. Refer to Figure 5 for their locations.

• Air Switch: Controls the main power flow to and from the battery.
• Active Balance Switch: Used to balance cell voltages.
• Fire Protection Device: An internal safety mechanism that activates at 180°C to release fire extinguishing material. If activated, the battery will not operate normally.

Figure 9: Close-up view of the Air Switch, Active Balance Switch, and Fire Protection Device.

4.3. Monitoring

The Powerwall can be monitored via a PC interface using the communication ports (RS485, CAN, RS232). This allows for real-time monitoring, multi-monitoring, parameter setting, system configuration, and data export.

Figure 10: PC monitoring interface for parameter settings.

Figure 11: PC monitoring interface for real-time data and cell voltage.

5. Maintenance

5.1. Active Balance Switch Usage

While the battery uses new Grade A cells, a voltage gap may develop after approximately six months of use. To address this:

1. Turn on the Active Balance Switch.
2. Cycle the battery (charge and discharge) approximately three times.
3. The battery voltage should return to normal.
4. Turn off the Active Balance Switch.

Note: The battery's overall capacity may be temporarily affected while the active balance switch is turned on.

5.2. General Care

• Keep the battery in a dry environment.
• Avoid exposure to extreme temperatures.
• Ensure proper ventilation around the unit.
• Regularly check connections for tightness and corrosion.

6. Troubleshooting

• Battery Not Starting Normally: If the fire protection device has activated (due to internal temperature reaching 180°C), the battery will not start. Inspect the unit and contact support.
• Voltage Imbalance: If cell voltages become unbalanced, follow the Active Balance Switch Usage instructions in Section 5.1.
• Communication Issues: Ensure all communication cables (RS485, CAN, RS232) are securely connected and that the correct drivers/software are installed for PC monitoring.
• General Technical Problems: For any technical issues not covered in this manual, please contact Tewaycell customer support.

7. Specifications

Figure 12: Battery charge and discharge curves.

8. User Tips

• Inverter Compatibility: Always double-check the compatibility of your inverter with the Powerwall. While many brands are supported, specific models may vary.
• Active Balancing: Utilize the active balance switch as described in the maintenance section if you notice voltage discrepancies after extended use to optimize battery health.
• Monitoring: Regularly check the PC monitoring interface for real-time data and to ensure all parameters are within optimal ranges.

9. Warranty and Support

9.1. Warranty Information

The Tewaycell Powerwall comes with a 10-year product life and a 7-year warranty.

9.2. Customer Support

For any technical problems or inquiries, please contact Tewaycell customer support. Our team is available 24 hours online to assist you.