1. Introduction
Thank you for choosing the Dumfume 25.6V 100Ah LiFePO4 Lithium Battery. This manual provides essential information for the safe and efficient use of your new battery. Our LiFePO4 batteries are designed for high energy density, stable performance, and a long lifespan, making them ideal for various deep cycle applications.
This product includes two (2) 25.6V 100Ah LiFePO4 batteries, each equipped with a 100A Battery Management System (BMS) to ensure reliable protection and optimal performance.
2. Safety Instructions
Please read and understand all safety instructions before installing or operating the battery. Failure to follow these instructions may result in serious injury, property damage, or voiding the warranty.
- General Safety: Always wear appropriate personal protective equipment (PPE) including safety glasses and gloves when handling batteries.
- Connection Safety: Ensure all connections are secure and properly insulated to prevent short circuits.
- Ventilation: While LiFePO4 batteries are generally safe, ensure adequate ventilation during charging and discharging.
- Temperature: Do not expose the battery to extreme temperatures outside its operating range.
- Water and Fire: Do not incinerate the battery or immerse it in water. Keep away from open flames and heat sources.
- Impact: Avoid dropping or subjecting the battery to severe impacts.
- Disassembly: Do not attempt to disassemble, modify, or repair the battery. Contact qualified personnel for service.
- Children: Keep batteries out of reach of children.
- California Proposition 65 Warning: ⚠ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
This image illustrates critical safety precautions: Do not use as a starting battery, do not incinerate or immerse in water, do not use for golf carts, and ensure identical batteries for series-parallel connections.
- Specific Usage Restrictions:
- Do not use this battery as a starting battery for vehicles.
- Do not use this battery for golf carts.
3. What's in the Box
Upon unpacking your Dumfume LiFePO4 battery package, please verify that all items listed below are present and undamaged:
- 2 x Dumfume 25.6V 100Ah LiFePO4 Lithium Battery
- 4 x M8 Terminal Bolts (2 per battery)
- 4 x Insulating Caps for Bolts (2 per battery)
- 1 x Product Manual (this document)
This image shows one 25.6V 100Ah LiFePO4 battery, two M8 terminal bolts, two insulating caps, and the product manual.
4. Specifications
The following table details the technical specifications of the Dumfume 25.6V 100Ah LiFePO4 Lithium Battery:
| Feature | Specification |
|---|---|
| Model Name | 25.6V 100Ah |
| Battery Type | LiFePO4 (Lithium Iron Phosphate) |
| Rated Voltage | 25.6 V (Nominal, for 24V systems) |
| Battery Capacity | 100 Ah |
| Energy (Wh) | 2560 Wh (2.56 kWh) |
| Continuous Power Output | 2560 W |
| BMS (Battery Management System) | Integrated 100A BMS |
| Max Charge/Discharge Current | 100 A |
| Recommended Charge Current | 20-50 A |
| Recommended Discharge Current | 0-60 A |
| Recommended Charging Voltage | 29.2 V |
| Cycle Life (100% DOD) | 4000+ cycles (up to 15000 cycles) |
| Lifespan | At least 10 years |
| Terminal Bolt Size | M8 |
| Item Weight (per battery) | 41.67 lbs (approx. 18.9 kg) |
| Item Length (No handle) | 20.08 inches (approx. 51 cm) |
| Item Length (With handle) | 21.06 inches (approx. 53.5 cm) |
| Item Width | 8.07 inches (approx. 20.5 cm) |
| Item Height | 8.46 inches (approx. 21.5 cm) |
| Operating Temperature (Discharging) | -4°F to 158°F (-20°C to 70°C) |
| Operating Temperature (Charging) | 32°F to 149°F (0°C to 65°C) |
| Storage Temperature | -10°C to 45°C (14°F to 113°F) |
| Series/Parallel Connection | Maximum 2S4P (2 in series, 4 in parallel) |
This diagram shows the length, width, and height of the 25.6V 100Ah battery (with and without handle), along with a detailed view of the M8 terminal bolt.
This image illustrates the wide temperature ranges for discharging (-4°F to 158°F) and charging (32°F to 149°F), highlighting the battery's adaptability to extreme conditions.
5. Setup
Proper setup is crucial for the performance and longevity of your LiFePO4 battery. Please follow these guidelines carefully.
5.1 Initial Inspection
Before installation, inspect each battery for any visible damage. Ensure the terminals are clean and free from debris.
5.2 Series and Parallel Connections
Your Dumfume LiFePO4 batteries can be connected in series or parallel to achieve higher voltage or capacity, respectively. The maximum configuration supported is 2S4P (2 batteries in series, 4 parallel strings).
- Important Rule for Series/Parallel Connections: To connect batteries in series or parallel, all batteries must be identical (same brand, type, voltage, capacity, and BMS) and ideally purchased within the same month to ensure optimal balance and performance.
- Series Connection: Connect the positive terminal of one battery to the negative terminal of the next to increase the total voltage. For example, connecting two 25.6V batteries in series will result in a 51.2V system.
- Parallel Connection: Connect positive terminals together and negative terminals together to increase the total capacity while maintaining the same voltage. For example, connecting two 25.6V 100Ah batteries in parallel will result in a 25.6V 200Ah system.
5.3 Terminal Connections
Use the provided M8 terminal bolts to connect your battery to your system. Ensure connections are tight and secure to prevent resistance and overheating. Use the insulating caps to cover the terminals after connection to prevent accidental short circuits.
5.4 Initial Charge
It is recommended to fully charge the battery before its first use to ensure optimal performance and calibration of the BMS.
6. Operating Instructions
Your Dumfume LiFePO4 battery is designed for reliable performance across a wide range of applications.
6.1 Intended Applications
These batteries are suitable for deep cycle applications such as:
- Off-Grid Systems
- Recreational Vehicles (RVs)
- Camping Power
- Solar Energy Storage
- Motorcycle Power (not as a starting battery)
- Monitoring Systems
- E-bikes
- Trolling Motors
- Kayaks
This image showcases the versatility of the Dumfume LiFePO4 battery in scenarios like monitoring systems, e-bikes, backup power, trolling motors, solar panels, camping, and RVs.
6.2 Battery Management System (BMS)
Each Dumfume LiFePO4 battery is equipped with a robust 100A BMS that provides comprehensive protection, ensuring the longevity and safety of the battery. The BMS protects against:
- Low Temperature
- High Temperature
- Overcharge
- Over-discharge
- Over-current
- Short Circuit
This diagram highlights the powerful BMS protection features, including safeguards against low/high temperature, overcharge, over-discharge, over-current, and short circuits, contributing to a 10+ year lifespan and 4000-15000 cycle times.
6.3 Charging and Discharging
- Charging: Use a LiFePO4 compatible charger with a recommended charging voltage of 29.2V and a current between 20-50A. Ensure charging occurs within the temperature range of 32°F to 149°F (0°C to 65°C).
- Discharging: The battery can discharge continuously up to 100A, providing 2560W of power. Ensure discharge occurs within the temperature range of -4°F to 158°F (-20°C to 70°C).
7. Maintenance
Proper maintenance will extend the life and performance of your Dumfume LiFePO4 battery.
- Regular Use: For optimal performance, charge and discharge the battery regularly.
- Long-Term Storage: If storing the battery for an extended period, ensure it is charged to approximately 50% of its capacity. Store in a cool, dry place within the recommended storage temperature of -10°C to 45°C (14°F to 113°F).
- Periodic Charging: Charge/discharge the battery once every 6 months to prevent damage from disuse and maintain cell balance.
- Terminal Inspection: Periodically check battery terminals for corrosion or loose connections. Clean and tighten as necessary.
- Cleaning: Keep the battery casing clean and free of dust and debris. Use a dry cloth for cleaning.
8. Troubleshooting
The integrated BMS provides protection against common issues. If the battery stops functioning, it may be due to a BMS protection trigger. Follow these general troubleshooting steps:
- No Power Output:
- Check all connections for tightness and proper polarity.
- Verify that the load is not exceeding the maximum continuous discharge current (100A) or power (2560W).
- The BMS may have triggered due to over-discharge. Attempt to charge the battery with a compatible LiFePO4 charger.
- Battery Not Charging:
- Ensure the charger is compatible with LiFePO4 batteries and set to the correct voltage (29.2V).
- Check charging current is within the recommended range (20-50A).
- Verify that the ambient temperature is within the charging temperature range (32°F to 149°F / 0°C to 65°C).
- The BMS may have triggered due to overcharge or high temperature. Disconnect the charger and allow the battery to cool down.
- Unusual Odor or Swelling:
- Immediately disconnect the battery from all loads and chargers.
- Move the battery to a safe, well-ventilated area away from flammable materials.
- Do not attempt to use or repair the battery. Contact support immediately.
- Short Circuit Protection:
- If a short circuit occurs, the BMS will cut off power. Remove the short circuit and the battery should automatically reset or require a brief charge to reactivate.
If issues persist after following these steps, please contact Dumfume customer support for assistance.
9. User Tips
- System Sizing: Always ensure your battery capacity and power output are appropriately sized for your application's energy demands to prevent frequent over-discharge or over-current events.
- Cable Sizing: Use appropriately gauged cables for your connections to minimize voltage drop and prevent overheating, especially for high-current applications.
- Monitoring: Consider using a battery monitor to keep track of voltage, current, and state of charge, which can help optimize battery life and prevent unexpected shutdowns.
10. Warranty and Support
For warranty information, technical support, or any questions regarding your Dumfume LiFePO4 battery, please contact the seller or Dumfume customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.