1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your SJY 51.2V 300Ah 15kWh LiFePO4 Lithium Battery. This battery is designed for off-grid solar photovoltaic energy storage systems and is assembled with 16 brand new 3.2V 300Ah lithium iron phosphate battery cells.
The integrated Battery Management System (BMS) has been completely upgraded, offering advanced protection functions and remote monitoring capabilities via Bluetooth and Wi-Fi.
2. Important Safety Warnings
⚠ 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 attempt to open, disassemble, or modify the battery pack.
- Ensure proper ventilation around the battery during operation and charging.
- Avoid exposing the battery to extreme temperatures, direct sunlight, or moisture.
- Use only compatible charging equipment and inverters.
- Do not connect batteries in series. This battery supports parallel connection only.
- In case of fire, use a suitable fire extinguisher for lithium-ion batteries (e.g., Class D or CO2). The battery is equipped with an advanced gas fire extinguishing device for rapid release of inert gases to inhibit thermal runaway.
3. Specifications
| Feature | Specification |
|---|---|
| Model Number | LFP-51.2V300Ah |
| Type | LiFePO4 (Lithium Iron Phosphate) |
| Nominal Voltage | 51.2V |
| Nominal Capacity | 300Ah |
| Energy | 15.36kWh (15kWh) |
| Operation Voltage Range | 44-58.4V |
| Max. Charging Voltage | 58.4V |
| Max. Charging/Discharging Current | 200A |
| Life Time (25°C) | 15 years |
| Life Cycles (25°C) | 10000 Cycles |
| Charging Temperature Limits | 0°C to 55°C |
| Discharging Temperature Limits | -20°C to 55°C |
| Operation Temperature | -20°C to 60°C @60+/-25% Relative Humidity |
| Storage Temperature | 0°C to 45°C @60+/-25% Relative Humidity |
| Battery Standard | IEC62619, UN38.3, ROHS, CE-EMC |
| Enclosure Protection Rating | IP65 |
| Dimensions (L*W*H) | 39cm * 27cm * 80cm (15.35in * 10.63in * 31.5in) |
| Weight | 115kg |
| Internal Cells | 16 pcs A Grade Prismatic Battery Cells |
| BMS | 16S 200A Smart BMS (JBD 16S 200A All protocols compatible BMS) |
| Communication | RS485 & CAN |
| Remote Control | Bluetooth & Wi-Fi |
| Application | Home Energy, Solar Power Storage, Off-Grid Solar Power System |
Note: Specifications are subject to change without prior notice.
4. Package Contents
Upon receiving your SJY LiFePO4 Battery, please verify that all items listed below are included and in good condition:
- SJY 51.2V 300Ah 15kWh LiFePO4 Battery Unit
- Wooden protective case (for shipping)
- Battery Power Cables
- Parallel Connection Cable (if applicable for multi-battery setups)
- User Manual (this document)
- Unpacking Instructions
5. Setup and Installation
5.1. Unpacking and Placement
- Carefully unpack the battery unit from its wooden case following the provided unpacking instructions.
- Place the battery on a stable, level surface in a well-ventilated area, away from direct sunlight, heat sources, and moisture.
- Ensure sufficient clearance around the battery for air circulation and maintenance.
5.2. Component Identification
Familiarize yourself with the main components of the battery unit:
- Cover: Protective casing of the battery.
- Weak Switch: Main power switch for the battery.
- Display Screen: LCD for displaying battery status and information.
- Status Lamp: Indicates operational status.
- Output Terminal: Connection points for power output.
- Communication Interface: Ports for RS485 and CAN communication.
- Reset Switch: For resetting the battery system.
- Power Indicator Light: Shows power status.
5.3. Parallel Connection
The SJY LiFePO4 battery supports parallel connection to achieve greater energy capacity. Up to 32 batteries can be connected in parallel. Important: Do NOT connect batteries in series.
5.4. Inverter Compatibility and Connection
This battery supports both CAN and RS485 communication protocols and is compatible with over 20 different brands of inverters, including Growatt, Pylontech, Deye, Invt, Luxpowertek, Voltronic Power, Goodwe, Solis, SVC Energy, SRNE, Victron Energy, Must, Sako, and Sofar.
For detailed wiring instructions, refer to the diagrams below. Ensure all connections are secure and correctly polarized (positive to positive, negative to negative).
5.4.1. Single Inverter Power Connection
5.4.2. Two Inverters in Parallel Connection
5.4.3. Three Inverters in Parallel Connection
Each photovoltaic panel needs to be connected to an independent system when using multiple inverters in parallel.
5.5. Initial Charging
Before first use, ensure the battery is fully charged according to the inverter's instructions and the battery's charging temperature limits (0°C to 55°C).
6. Operation
6.1. Powering On/Off
Use the independent 'Weak Switch' (2) on the battery unit to turn the system on or off as needed. The 'Power Indicator Light' (8) will show the power status.
6.2. Monitoring with LCD Display
The 'Display Screen' (3) provides a clear digital display of the battery's operational parameters, making it easy to read and monitor key information.
6.3. Smart Connectivity (Bluetooth & Wi-Fi)
The advanced intelligent BMS allows for remote connection and monitoring of the battery's operating status via Bluetooth and Wi-Fi. Download the dedicated mobile application to access detailed information such as:
- Basic Info: Pack Voltage, Current, State of Charge (SOC), Rated Capacity, Full Capacity, Remaining Capacity, Cycle Index, Parallel Num.
- Volt & Temp: Individual cell voltages and pack cell temperatures (T1, T2, T3, T4).
- System Info: Detailed system parameters.
- Inverter Protocol Selection: Choose between CAN and RS485 protocols for various inverter brands (e.g., Pylon, Growatt, GoodWe, Sofar).
6.4. BMS Protection Functions
The BMS offers over 20 battery protection functions to ensure the battery operates in a safe environment. These include, but are not limited to, over-charge protection, over-discharge protection, over-current protection, short-circuit protection, and temperature protection.
6.5. System Application Scenarios
The SJY LiFePO4 battery is suitable for various energy storage applications, including home energy systems, solar power storage, and off-grid solar power systems. It can be integrated with PV panels, generators, and utility grids to power home appliances.
6.6. Product Video Overview
For a visual guide on the manufacturing process, testing, and features of the SJY LiFePO4 battery, please watch the official product video:
7. Maintenance
7.1. General Care
- Regularly inspect the battery for any signs of damage, corrosion, or loose connections.
- Keep the battery clean and free from dust and debris. Use a dry, soft cloth for cleaning.
- Ensure the ventilation openings are not obstructed.
7.2. Storage Guidelines
If the battery is to be stored for an extended period, ensure it is charged to approximately 50% State of Charge (SOC) and stored within the recommended temperature range:
- 5 months @ 25°C
- 3 months @ 35°C
- 1 month @ 45°C
Avoid storing the battery in temperatures outside the 0°C to 45°C range.
7.3. Disposal
Lithium-ion batteries must be disposed of responsibly. Do not dispose of the battery with general household waste. Please consult your local authority's website for information on proper recycling and disposal procedures for lithium-ion batteries in your region.
8. Troubleshooting
This section addresses common issues you might encounter. For problems not listed here, please contact customer support.
8.1. Battery Not Charging/Discharging
- Check all power cable connections to ensure they are secure and correctly polarized.
- Verify that the 'Weak Switch' is in the ON position.
- Confirm that the inverter is correctly configured and compatible with the battery's communication protocol (CAN/RS485).
- Check the battery's LCD display or mobile app for any alarm states or protection functions activated by the BMS.
8.2. Inverter Communication Issues
- Ensure the correct communication protocol (CAN or RS485) is selected on both the battery and the inverter. Refer to the inverter's manual for its specific settings.
- Verify the communication cables are properly connected.
- If using the mobile app, check the 'Inverter Protocol' settings to ensure it matches your inverter brand.
8.3. Reduced Performance
- Check the battery's temperature. Operation outside the recommended temperature range (-20°C to 60°C) can affect performance.
- Ensure the battery is not being over-discharged or over-charged frequently, which can impact its lifespan.
- Verify that the battery cells are balanced via the mobile app's 'Volt & Temp' section.
9. User Tips
- Inverter Compatibility: Always confirm your inverter's compatibility with the battery's CAN or RS485 protocols before purchase and installation. Some users have successfully paired this battery with Victron 5000 inverters.
- Initial Charge: Batteries are often shipped partially charged (e.g., around 50%). It's good practice to fully charge the battery before its first major use.
- Remote Monitoring: Utilize the Bluetooth and Wi-Fi features with the mobile app to keep a close eye on your battery's health and performance. This can help in proactive maintenance and troubleshooting.
10. Warranty and Support
For warranty information, technical support, or any inquiries regarding your SJY LiFePO4 battery, please contact the seller or manufacturer directly. Keep your purchase records handy when seeking support.
