1. Introduction
Thank you for choosing the Dumfume 12V 314Ah LiFePO4 Battery. This manual provides essential information for the safe and efficient use of your battery. Designed for extended power in RVs, solar systems, and off-grid applications, this battery features advanced technology for reliability and longevity. Please read this manual thoroughly before installation and operation.
2. Product Features
- High Capacity: 314Ah (4.01kWh) for substantial and long-lasting power.
- Advanced BMS: Built-in 200A Battery Management System (BMS) provides protection against overcharge, over-discharge, over-current, short circuits, high temperature, and low temperature.
- Long Cycle Life: Engineered for over 4,000 cycles at 100% Depth of Discharge (DOD) and more than 6,000 cycles at 80% DOD, significantly surpassing lead-acid batteries.
- Compact & Lightweight: Dimensions of 15.16"x7.59"x9.84" (with handle) and a weight of 57.28 lbs per unit, offering portability and space efficiency.
- Easy Expandability: Supports parallel connections for increased capacity (up to 628Ah with two units) and up to 4S4P configurations for larger systems.
- Low-Temperature Cut-Off Protection: Intelligently stops charging at 0°C (32°F) and discharging at -20°C (-4°F) to protect the battery.
- Bluetooth Connectivity: Allows for convenient monitoring of battery status via a smartphone application.
Figure 1: Smart BMS Protection against various conditions.
Figure 2: Low-Temperature Cut-Off Protection for enhanced battery safety.
3. What's in the Box
Upon opening your package, you should find the following items:
- Dumfume 12V 314Ah LiFePO4 Battery
- User Manual
- M8 Terminal Bolts (2 per battery)
- Insulating Caps for Bolts (2 per battery)
Figure 3: Items included in the product packaging.
4. Specifications
| Parameter | Value |
|---|---|
| Rated Capacity | 314Ah |
| Rated Voltage | 12.8V |
| Terminal Bolt Size | M8 |
| Recommended Charging Current | 50-100A |
| Continuous Max Charging/Discharging Current | 200A |
| Charging Limit Voltage | 14.6V |
| Dimensions (With Handle) | 15.16"x7.59"x9.84" |
| Weight | 57.28 lbs |
| Charging Temperature | 0°C ~ 65°C |
| Discharging Temperature | -20°C ~ 70°C |
5. Safety Information
- This battery is designed for energy storage, not for use as an engine starter battery.
- Ensure proper ventilation during operation and charging.
- Do not short circuit, disassemble, crush, heat, or incinerate the battery.
- Do not immerse the battery in water.
- Always use a compatible LiFePO4 battery charger with appropriate voltage and current range.
- Verify suitability for your application before purchase, especially regarding temperature requirements.
Figure 4: Important usage restrictions and safety warnings.
6. Setup & Installation
6.1 Initial Voltage Check
Before connecting batteries in series or parallel, it is crucial to test the voltage of each individual battery. Ensure that the voltage of each battery is consistent, or the difference between batteries is no more than 0.1V. If the voltage difference is too large, use a compatible charger to bring the batteries to a consistent voltage before proceeding with connections.
6.2 Parallel Connection
To increase the total capacity, you can connect multiple Dumfume 12V 314Ah batteries in parallel. This creates a higher amp-hour system while maintaining the 12V nominal voltage. For example, connecting two 12V 314Ah batteries in parallel will create a 12V 628Ah system. Ensure all batteries are of the same brand, type, voltage, capacity, and BMS, and were purchased around the same time. Fully charge each battery separately to a voltage at rest of >13.4V. Connect the batteries one by one in parallel and leave them together for 1-2 hours for balancing.
6.3 Series Connection
For higher voltage systems, you can connect multiple batteries in series. The Dumfume 12V 314Ah battery supports up to 4S4P configurations. When connecting in series, the voltage adds up (e.g., two 12V batteries in series create a 24V system), while the amp-hour capacity remains the same as a single battery. Always ensure voltage consistency between batteries before making series connections.
Video 1: Demonstration of 12V battery series and parallel connection methods, including voltage testing and balancing procedures.
6.4 Controller/Inverter Settings
When integrating the battery with a solar charge controller or inverter, configure the settings according to the battery's specifications. If using multiple batteries in series, multiply the single battery voltage settings by the number of batteries in series.
- Charging Voltage: 14.6V
- Float Voltage: 14.2V
- Charging Current: 0.2-0.5C
- Current Limit: ≤ 200A
- High Voltage Disconnect Voltage: 14.6V + 0.1V
- High Voltage Recovery Voltage: 14.2V + 0.1V
- Low Voltage Disconnect Voltage: 9.2V ± 0.12V
- Low Voltage Recovery Voltage: 10.8V ± 0.12V
- Balanced Charging: Off
- Charging Temperature Range: 0°C to 45°C
- Discharging Temperature Range: -20°C to 45°C
- Storage Temperature: -10°C to 45°C
Figure 5: Recommended settings for charge controllers and inverters.
7. Operation
Once properly installed, the Dumfume LiFePO4 battery is ready for operation. It is designed to provide reliable power for your RV, solar energy storage, and off-grid systems. The integrated Bluetooth functionality allows for convenient monitoring of the battery's status directly from your smartphone.
Video 2: Unboxing and overview of the 12V 314Ah LiFePO4 battery, including a demonstration of its Bluetooth app connectivity for monitoring.
Video 3: Practical demonstration of a 12V 300Ah lithium battery powering a microwave in an RV setup, showcasing its use with an inverter and app monitoring.
8. Maintenance & Storage
- For optimal storage and to maintain battery health during extended periods of non-use, perform a full charge/discharge cycle every 6 months.
- Ensure the battery is stored within the recommended temperature range of -10°C to 45°C.
- Battery performance requires temperatures of 5°C or higher. Operating below this temperature may affect efficiency.
9. Troubleshooting
The built-in BMS provides comprehensive protection and can indicate potential issues. Refer to your smartphone app for detailed fault indicators if available.
- Overcharge Protection: The BMS will stop charging if the voltage exceeds the safe limit (14.6V + 0.1V).
- Over-discharge Protection: The BMS will disconnect the load if the voltage drops below the safe limit (9.2V ± 0.12V).
- Over-current Protection: The BMS will cut off current if it exceeds 200A continuously.
- Short Circuit Protection: The BMS will immediately cut off power in case of a short circuit.
- High/Low Temperature Protection: Charging will stop if the temperature is below 0°C or above 65°C. Discharging will stop if the temperature is below -20°C or above 70°C.
- Battery Not Recognized by Charger: Ensure you are using a LiFePO4 battery charger with an activation function, especially if the battery's voltage is very low.
10. Warranty & Support
Dumfume batteries feature built-in BMS protection against common issues like overcharge/over-discharge, short circuits, and overheating, ensuring safety and reliability. For any safety concerns, compatibility verification, or technical assistance, the Dumfume Support Team is available 24/7.
Dumfume offers a range of voltage options from 12V to 48V modular systems. Consult the Dumfume Support Team for specific compatibility verification for your setup.
