1. Introduction
This manual provides comprehensive instructions for the safe and efficient use of your Tewaycell LiFePO4 Battery Pack. Designed for household energy storage, these battery packs offer high capacity, long cycle life, and advanced communication features. Please read this manual thoroughly before installation and operation to ensure proper functionality and safety.
Figure 1: Tewaycell 15KWh LiFePO4 Battery Pack
2. Safety Information
Always observe the following safety precautions to prevent injury or damage to the battery pack and connected equipment:
- 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. Ensure correct polarity during connection.
- Charge the battery only with a specified charger according to the charging requirements.
- Ensure correct connection between the inverter and MPPT. For any technical problems, contact Tewaycell support.
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. Specifications
Model: TW-MB48300-100A-HWB
| Feature | Specification |
|---|---|
| Nominal Voltage | 48.0V (15S) |
| Nominal Capacity | 300Ah @ 0.2C |
| Battery Power | 14400Wh |
| Internal Resistance | ≤100mΩ |
| Cycle Life | 6000+ times |
| Self-Discharge | ≤3.5% (monthly @ 25°C) |
| Charging Voltage | 53.2-54V |
| Charging Cut-off Voltage | 54.75V |
| Standard Discharge Current | 40A |
| Maximum Sustained Discharge | 200A |
| Maximum Pulse Current | 300A (＜30S) |
| Standard Charging Current | 40A |
| Maximum Continuous Charging Current | 200A |
| Maximum Discharge Power | 5000W |
| Charging Temperature | 0°C to 45°C |
| Discharge Temperature | -20°C to 60°C |
| Dustproof and Waterproof Rating | IP55 |
| Shell Material | SPCC |
| Size | 520x300x900mm |
| Weight | 125KG |
| Packing Weight | 143KG |
| Communication Ports | RS485*3 / CAN / RS232 |
| Compatible Inverter Brands | Growatt, Goodwe, SofarSolar, Deye, Voltronic, Victron, SRNE... |
Model: TW-MB51300-200A-HWB
| Feature | Specification |
|---|---|
| Nominal Voltage | 51.2V (16S) |
| Nominal Capacity | 300Ah @ 0.2C |
| Battery Power | 15360Wh |
| Internal Resistance | ≤100mΩ |
| Cycle Life | 6000+ times |
| Self-Discharge | ≤3.5% (monthly @ 25°C) |
| Charging Voltage | 56.8V |
| Charging Cut-off Voltage | 57.6V |
| Standard Discharge Current | 80A |
| Maximum Sustained Discharge | 400A |
| Maximum Pulse Current | 600A (＜30S) |
| Maximum Continuous Charging Current | 200A |
| Maximum Discharge Power | 10000W |
| Charging Temperature | 0°C to 45°C |
| Discharge Temperature | -20°C to 60°C |
| Dustproof and Waterproof Rating | IP55 |
| Shell Material | SPCC |
| Size | 520*460*780mm |
| Weight | 127KG |
| Packing Weight | 155KG |
| Communication Ports | RS485*3 / CAN / RS232 |
| Compatible Inverter Brands | Growatt, Goodwe, SofarSolar, Deye, Voltronic, Victron, SRNE... |
Figure 2: Key Features Overview
Figure 3: Built-in Battery Management System (BMS) Features
Figure 4: Product Certifications
4. Package Contents
Upon receiving your Tewaycell LiFePO4 Battery Pack, please verify that all items listed below are included in the package:
- Tewaycell LiFePO4 Battery Pack (1 unit)
- Fit screws for installation
- Parallel power cable (red and black set)
- Mechanical support
- Inverter Communication Cable (for RS485/CAN/RS232)
Figure 5: Package Contents
5. Setup and Installation
5.1 General System Connection
The Tewaycell LiFePO4 Battery Pack integrates seamlessly into various energy systems, including solar, utility grid, and generator setups. The battery connects to a power inverter, which manages energy flow to your home and can interface with monitoring systems.
Figure 6: Schematic Diagram of Powerwall Connection
5.2 Parallel Connection
For increased capacity and power output, multiple Tewaycell battery packs can be connected in parallel. The system supports up to 16 parallel connections. Ensure all connections are secure and follow local electrical codes.
Figure 7: Parallel Connection Setup (up to 16 units)
5.3 High Current Discharge Wiring
When configuring for high current discharge with multiple battery packs, it is crucial to use appropriate cabling and an air switch capable of handling the combined current. The provided parallel power cables are designed for this purpose. Ensure all cables support the required current (e.g., 200A for the 48V model, 400A for the 51.2V model).
Figure 8: High Current Discharge Wiring Diagram
6. Operation
6.1 Controls and Indicators
The top panel of the battery pack features various controls and indicators for monitoring and operation:
Figure 9: Battery Top Panel Details
- Positive Terminal (+): For connecting positive power cables.
- Negative Terminal (-): For connecting negative power cables.
- Power Switch: Turns the battery pack ON/OFF.
- ON/OFF Indicator: Shows the power status.
- Reset Button: For resetting the battery management system.
- Alarm Indicator: Illuminates to indicate a fault or warning.
- SOC Indicator: Displays the State of Charge.
- DIP Switch: Used for configuring parallel connections or other settings.
- Running Indicator: Shows normal operation status.
- Communication Port (RS485*3/CAN/RS232): For connecting to inverters and monitoring systems.
- Dry Contact: For external control or signaling.
6.2 Monitoring
The battery pack can be monitored via a PC interface or through the PVguarder APP/Web platform, providing real-time data and control over various parameters.
PC Monitoring Interface
Figure 10: PC Battery Monitoring Interface
The PC monitoring software allows users to view real-time battery status, historical data, and configure various parameters. This includes cell voltage, pack voltage, current, remaining capacity, full capacity, cycle count, and temperature.
Parameter Settings
Figure 11: Battery Parameter Setting Interface
Advanced users can adjust parameters such as over-voltage protection, over-current protection, temperature limits, and balancing thresholds through the parameter setting interface. Always exercise caution when modifying these settings.
6.3 Battery Performance Curves
Understanding the battery's performance characteristics is essential for optimizing its use. The following graphs illustrate typical charge and discharge behavior:
Figure 12: Battery Charge & Discharge Curves
Figure 13: Battery Test Curve Analysis
- Different Rate Discharge Curve: Shows how the battery's voltage and capacity vary under different discharge rates (e.g., 0.2C, 0.5C) at a constant temperature.
- Different Temperature Discharge Curve: Illustrates the battery's performance across various temperatures (e.g., -20°C, 0°C, 25°C, 60°C) at a specific discharge rate.
- Open Circuit Voltage vs. SOC: Depicts the relationship between the battery's open circuit voltage and its State of Charge.
- Charge Characteristics: Details the voltage and current behavior during charging cycles.
7. Maintenance
To ensure the longevity and optimal performance of your Tewaycell LiFePO4 Battery Pack, follow these maintenance guidelines:
- Regular Inspection: Periodically check the battery pack for any physical damage, loose connections, or signs of corrosion.
- Cleaning: Keep the battery pack clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquids.
- Environmental Conditions: Ensure the battery operates within the specified temperature ranges (Charging: 0°C to 45°C; Discharge: -20°C to 60°C). The IP55 rating provides protection against dust and low-pressure water jets, but avoid direct exposure to heavy rain or immersion.
- Firmware Updates: If available, regularly check for and apply firmware updates for the BMS to ensure optimal performance and security.
8. Troubleshooting
If you encounter issues with your Tewaycell LiFePO4 Battery Pack, consider the following basic troubleshooting steps:
- No Power Output: Check if the power switch is ON. Verify all cable connections are secure and correctly polarized. Ensure the inverter is functioning correctly.
- Alarm Indicator On: Refer to the monitoring interface for specific error codes or warnings. This could indicate over-voltage, under-voltage, over-current, or temperature issues.
- Charging Issues: Confirm the charger is connected properly and meets the battery's charging voltage and current requirements. Check the charging temperature.
- Communication Problems: Ensure communication cables are correctly connected to the battery and inverter/monitoring device. Check the communication port settings on the monitoring software.
If problems persist after performing these checks, please contact Tewaycell technical support for further assistance.
9. User Tips
Maximize the performance and lifespan of your battery pack with these general tips:
- Optimal Placement: Install the battery in a well-ventilated area, away from direct sunlight and heat sources, to maintain ideal operating temperatures.
- Regular Monitoring: Utilize the PC monitoring software or PVguarder APP/Web to regularly check the battery's health, State of Charge (SOC), and any alerts.
- Balanced Charging: Ensure your charging system provides balanced charging to all cells for optimal battery health over time. The built-in BMS assists with this.
- Professional Installation: For complex setups involving multiple batteries or integration with existing solar/inverter systems, consider professional installation to ensure safety and compliance.
10. Warranty and Support
Tewaycell provides a robust warranty for its LiFePO4 Battery Packs, ensuring peace of mind for your energy storage investment.
- Product Life: The battery pack is designed for a life of 10 years.
- Warranty Period: A 7-year warranty is provided for the battery's Ampere-hour (AH) capacity.
For technical assistance, warranty claims, or any questions regarding your Tewaycell LiFePO4 Battery Pack, please contact Tewaycell customer support. Support is available 24 hours online.
