SAIJIAOYANG 12V/24V LiFePO4 Lithium Battery User Manual

1. Introduction

This manual provides essential information for the safe and efficient use of your SJY LiFePO4 Lithium Battery. Please read it thoroughly before installation and operation. These batteries are designed for deep cycle applications such as EV/Storage, RV, Marine Boat, Home Energy, Solar Power Storage, and Off-Grid Solar Power Systems.

SJY LiFePO4 Lithium Batteries

2. Specifications

SJY LiFePO4 batteries are built with A-grade prismatic cells, offering high security and extended cycle life.

General Specifications:

• Brand Name: SJY
• Model Number: LiFePO4 Battery Pack
• Type: LiFePO4
• Connection: Others (Supports series and parallel connections)
• High-concerned chemical: None
• Origin: Mainland China
• Certification: CE, RoHS, UL
• Warranty: 2 Years

Battery Model Details:

Battery Type Specifications

Individual 3.2V 280Ah Cell Specifications:

• Voltage: 3.2 V
• Capacity: 280 Ah
• Weight: ~5500 g
• Charge Rate: 0.5 C (150 A)
• Discharge Rate: 0.5 C (150 A)
• Cycle Life: >10,000 times

3.2V 280Ah Prismatic Cell Details

3. Setup

Series and Parallel Connection:

These batteries offer excellent scalability, supporting up to 2 batteries in series and 4 in parallel for 24V/48V DIY energy systems. This allows for flexible configuration to meet various power requirements.

Battery Scalability for DIY Energy Systems

Important Note for Series Connection:

Before connecting batteries in series, each single battery needs to be fully charged. Then, connect them in parallel for 24 hours to allow them to auto-balance. When connecting, ensure that the wire lengths are consistent to maintain optimal performance and balance.

Connecting to an Inverter:

The following video demonstrates the process of connecting LiFePO4 batteries in series and then to an inverter. This example shows a 4-series connection of 12V 100Ah batteries to achieve a 48V 100Ah system.

Video: Series Connection and Inverter Setup for LiFePO4 Batteries

1. Measure the voltage of each battery pack to ensure they are fully charged and balanced.
2. Connect the batteries in series using appropriate cables, ensuring correct polarity (positive to negative).
3. Connect the total positive and negative wires from the battery bank to the inverter.
4. Secure all connections tightly.
5. Start the inverter and select the correct battery type in the inverter settings (e.g., 'LiFePO4' or 'AGM' if LiFePO4 is not an option, as shown in the video).

4. Operating

Built-in Battery Management System (BMS):

Your SJY LiFePO4 battery includes a professional BMS to ensure safe and optimal operation. The BMS provides the following protection functions:

• Overvoltage and Undervoltage Protection
• Over-current Charging Protection
• Overheat Charging Protection
• Under-temperature Charging Protection
• Overheat Discharge Protection
• Under-temperature Discharge Protection
• Short Circuit Protection
• Cell Balancing Function

BMS Protection Features

Temperature Operating Ranges:

The BMS intelligently manages charging and discharging based on temperature to prevent damage and ensure longevity.

• Low Temperature Disconnection:
  • Stop discharge: < -20°C
  • Stop charge: < 0°C
  • Resume charge: ≥ 5°C
• High Temperature Disconnection:
  • Stop charge: > 55°C
  • Stop discharge: > 60°C
  • Resume charge and discharge: ≥ 50°C

Temperature Protection for Charging and Discharging

5. Maintenance

Charging and Storage:

⚠️ Please be aware of potential fire risks and strictly follow the instruction manual for charging and storage.

• Always use a charger specifically designed for LiFePO4 batteries.
• Store batteries in a cool, dry place, away from direct sunlight and extreme temperatures.
• Avoid storing batteries fully discharged for extended periods.

Self-Discharge Rate:

SJY LiFePO4 batteries have a low self-discharge rate of approximately 3% per month. Even after 6 months of storage, the battery can maintain approximately 80% of its energy.

LiFePO4 vs. Lead Acid Battery Comparison

Disposal:

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.

6. Troubleshooting

The integrated BMS is designed to prevent most common issues by providing comprehensive protection. If you experience any problems, consider the following general troubleshooting steps:

• No Power Output: Check all cable connections for tightness and correct polarity. Verify the battery voltage with a multimeter. Ensure the inverter (if used) is correctly configured for LiFePO4 batteries.
• Charging Issues: Confirm your charger is compatible with LiFePO4 batteries and is functioning correctly. Check the battery temperature to ensure it's within the acceptable charging range (above 0°C).
• Inverter Not Starting: Ensure the battery bank voltage matches the inverter's input requirements. Check the inverter's display for error codes and consult its manual.

For persistent issues, please contact SJY customer support for assistance.

7. User Tips

• External Monitoring: While some models may have built-in monitors, consider an external battery monitor for precise capacity tracking, especially in critical applications like marine use.
• Solar System Compatibility: These batteries are highly suitable for solar power systems. Ensure your solar charge controller and inverter are compatible with LiFePO4 battery characteristics.
• Wire Length Consistency: When connecting multiple batteries in series or parallel, use cables of consistent length and gauge to ensure even current distribution and optimal performance.
• Not for Engine Starting: These deep cycle batteries are not designed for engine starting applications in daily use vehicles. They are optimized for sustained power delivery.

8. Warranty and Support

Your SJY LiFePO4 Lithium Battery comes with a 2-year warranty from the date of purchase, covering manufacturing defects and material faults under normal use conditions.

For any technical support, warranty claims, or questions regarding your product, please contact SJY customer service through your purchase platform or the official SJY website.