1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Tewaycell 48V/51V 15KWh Powerwall LiFePO4 Battery Pack. Please read this manual thoroughly before using the product and keep it for future reference.
The Tewaycell Powerwall is a high-capacity Lithium Iron Phosphate (LiFePO4) battery pack designed for household energy storage. It features a built-in Battery Management System (BMS) for optimal performance and safety, and supports communication protocols like CAN and RS485 for seamless integration with compatible inverters.
Figure 1: Tewaycell 15KWh Powerwall LiFePO4 Battery Pack. Key features include 6000+ cycles, CAN/RS485 communication, built-in BMS, mobile design, and Grade A cells.
2. Safety Warnings
Failure to follow these safety instructions may result in fire, electric shock, serious injury, or death.
- 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 or magnetic fields, as this may compromise battery safety.
- Do not reverse the positive (+) and negative (-) terminals. Prevent reverse connection.
- Charge the battery only with a specified charger according to the charging requirements.
- Ensure proper connection between the inverter and MPPT. If you encounter any technical problems, contact Tewaycell support immediately.
2.1 California Proposition 65 Warning
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
3. Product Specifications
| Feature | 15S 48.0V 15KWh Model | 16S 51.2V 16KWh Model |
|---|---|---|
| Model Number | TW-48V-300AH | |
| Battery Type | LiFePO4 | |
| Cell & Format | 15S1P, EVE 304Ah Grade A+ | 16S1P, EVE 304Ah Grade A+ |
| Nominal Voltage | 48.0V | 51.2V |
| Nominal Capacity | 304AH | |
| Nominal Energy | 14592Wh (approx. 15KWh) | 15565Wh (approx. 16KWh) |
| Cycle Life | 6000+ @0.2C, 25℃, 80% DOD | |
| Max. Continuous Output Power | 5000W | |
| Max. Charge Voltage | 54.7V | 58.4V |
| Discharge Cut-off Voltage | 40.5V | 43.2V |
| Max. Continuous Charge Current | 100A | |
| Max. Continuous Discharge Current | 100A | |
| Max. Pulse Current | 200A (<1S) | |
| Charge Temperature | 0℃~55℃ | |
| Discharge Temperature | -20℃~60℃ | |
| Temperature Controlled Fire Extinguisher | Yes | |
| Active Balancer | Yes | |
| Net Weight | 131 Kg | 137 Kg |
| Gross Weight (approx.) | 151 Kg | 157 Kg |
| Dimensions (H*L*W) | 900 (wheel included) * 520 * 300 mm | |
| Communication Ports | RS485*3 / CAN / RS232 | |
| Adaptable Inverter List | GROWATT, Deye, GOODWE, VICTRON, SOFAR, SRNE, VOLTRONIC POWER, Pylon, SMA, Tbbpower, Schneider, ARUN, SOLAX, LTW, SZPC, BAKEE, MUST, LUXPOWER | |
| Shell Material | SPCC | |
| Dustproof and Waterproof Rating | IP55 | |
| Port Type | M8 | |
Figure 2: Physical dimensions of the Tewaycell Powerwall (900mm H x 520mm L x 300mm W) and integrated handle for mobility.
Figure 3: A selection of inverter brands compatible with the Tewaycell Powerwall.
4. Setup Instructions
4.1 Unpacking and Inspection
Carefully unpack the battery pack and inspect it for any signs of damage during transit. Ensure all components listed in the packing list are present.
4.2 Packing List
Figure 4: Included accessories: fit screws, parallel power cable, and inverter communication cable (RS485/CAN/RS232).
The package should contain:
- Tewaycell Powerwall Battery Pack
- Fit screws
- Parallel Power Cable (for connecting multiple units)
- Inverter Cable for RS485/CAN/RS232 communication
4.3 Physical Installation
The battery pack is equipped with wheels for easy movement. Position the unit on a stable, level surface in a well-ventilated area, away from direct sunlight, heat sources, and flammable materials. Ensure adequate clearance around the unit for air circulation.
4.4 Electrical Connections
Refer to the schematic diagrams for proper wiring. All electrical connections should be performed by a qualified professional.
Figure 5: General connection diagram for the Powerwall, showing integration with solar panels, utility grid, generator, power inverter, and home loads. Monitoring is available via PVguarder APP/Web.
Figure 6: Top panel details including Air Switch, Positive/Negative Terminals, Active Balance Switch, Power Switch, Communication Port, Dry Contact, DIP Switch, Alarm Indicator, Reset, and Running Indicator.
- Connect to Inverter: Connect the battery pack to your compatible power inverter using appropriate cables. Ensure correct polarity for positive (+) and negative (-) terminals. The battery uses M8 port type connectors.
- Communication Cables: Connect the provided RS485/CAN/RS232 communication cable between the battery and your inverter for data exchange and monitoring.
- Parallel Connection (Optional): The system supports up to 16 parallel connections for increased capacity. When connecting multiple battery packs in parallel, use the provided parallel power cables and ensure all units are properly configured.
Figure 7: Example of multiple Tewaycell Powerwalls connected in parallel to a household energy system, supporting up to 16 units.
Figure 8: High Current Discharge configuration example, illustrating two 15KWh batteries connected through an Air Switch to multiple inverters. Note: The cable connecting inverters needs to support 200A current.
5. Operating Instructions
5.1 Initial Power-Up
After all connections are secure, turn on the Air Switch located on the top panel of the battery pack. The system should initiate, and the running indicator will light up.
5.2 Battery Management System (BMS)
The Tewaycell Powerwall features a built-in intelligent BMS that provides comprehensive protection and management for the battery cells. This includes:
- Over Charge Protection
- Overdischarge Protection
- Temperature Monitoring (NTC)
- Automatic Battery Balancing
- Current Protection
Figure 9: Visual representation of the Built-in BMS and its protective functions.
5.3 Active Balance Switch
The active balance switch is designed to maintain cell voltage equilibrium. While the battery uses Grade A+ cells, a slight voltage gap may develop after approximately six months of use. To rebalance the cells:
- Turn on the Active Balance switch.
- Allow the battery to cycle (charge and discharge) approximately 3 times.
- Once the voltage returns to normal, turn off the Active Balance switch.
Note: The capacity of the battery may be temporarily affected while the active balance switch is turned on.
5.4 Monitoring
The battery pack can be monitored via a PC interface using the communication ports (RS485/CAN/RS232). This interface allows for real-time monitoring of battery status, multi-monitoring information, parameter settings, system configuration, and data export.
Figure 10: Example screenshot of the PC monitoring interface, displaying real-time data and configuration options.
Figure 11: Typical battery charge and discharge curve characteristics at 0.2C and 0.5C at 25°C.
6. Maintenance
- Regular Inspection: Periodically check all cables and connections for tightness and signs of wear or damage.
- Cleaning: Keep the battery pack clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquids or abrasive cleaners.
- Environmental Conditions: Ensure the battery is stored and operated within the specified temperature ranges (Charge: 0℃~55℃, Discharge: -20℃~60℃). Avoid high humidity and direct exposure to water.
- Active Balance: Follow the instructions in Section 5.3 for using the active balance switch to maintain cell health.
7. Troubleshooting
7.1 Fire Protection Device
The battery pack is equipped with a temperature-controlled fire extinguishing device. This device will not activate under normal operating conditions. If the internal temperature reaches 180 ℃, the device will automatically activate and release fire extinguishing material to prevent further issues.
Figure 12: Location of the Air Switch, Active Balance switch, and the internal Fire Protection Device.
7.2 General Issues
- Battery not powering on: Check the Air Switch is in the 'ON' position. Verify all power connections are secure.
- Inverter not recognizing battery: Ensure communication cables (RS485/CAN/RS232) are correctly connected and the inverter is configured for the battery type. Refer to your inverter's manual for communication setup.
- Voltage imbalance: Refer to Section 5.3 regarding the use of the Active Balance Switch.
If you experience any technical problems that cannot be resolved using this manual, please contact Tewaycell customer support for assistance. Our support team is available 24 hours online.
8. User Tips
- Inverter Compatibility: Always verify your inverter's compatibility with the Tewaycell Powerwall. A list of compatible inverter brands is provided in the specifications and often visually in product images.
- Parallel Connections: When expanding your system with multiple battery packs, ensure all units are identical models and follow the parallel connection guidelines carefully to maintain system stability and performance.
- Monitoring Software: Utilize the PC monitoring software to keep track of your battery's performance and health. Regularly check parameters and export data for long-term analysis.
9. Warranty and Support
9.1 Warranty Information
The Tewaycell Powerwall LiFePO4 Battery Pack comes with a 10-year life expectancy and a 7-year warranty on its Ampere-hour (AH) capacity. Please retain your proof of purchase for warranty claims.
9.2 Customer Support
For technical assistance, troubleshooting, or any questions regarding your Tewaycell Powerwall, please contact Tewaycell customer support. Our team is available 24 hours online to provide prompt assistance.
