12.8V 620Ah LiFePO4 Battery 7.9kWh 8000 Cycles 400A Continuous 800A Pulse

12.8V 620Ah LiFePO4 Battery 7.9kWh 8000 Cycles 400A Continuous 800A Pulse

Product Overview
This 12.8V 620Ah lithium iron phosphate battery stores 7936 watt hours of energy in a rugged IP65 rated PPE enclosure. With an ultra low internal resistance of ≤15mΩ and an impressive cycle life exceeding 8000 cycles (retaining >70% of original capacity), it is designed for demanding deep cycle applications such as off grid solar storage, marine house banks, RV power systems, and industrial backup. The integrated Battery Management System supports Bluetooth, CAN, and RS485 communication, and the battery can be configured in up to 4 series or 4 parallel connections.

Key Electrical Specifications
Nominal voltage is 12.8V with 620Ah rated capacity and total energy of 7936Wh. Internal resistance is ≤15 milliohms, ensuring efficient power delivery. Efficiency reaches 98 percent. Self discharge is less than 3 percent per month. The cell configuration is 4 cells in series and 2 cells in parallel (4S2P). Dimensions are 690mm length, 250mm width, and 280mm height. Weight is 55 kilograms. Terminal type is M8. Housing is PPE (polyphenylene ) with IP65 dust and water jet protection. Cell chemistry is LiFePO4. Communication options include Bluetooth, CAN, and RS485.

Discharge Performance
Continuous discharge current is 400 amps, capable of powering large inverters up to 5000W or running multiple heavy loads simultaneously. Pulse discharge current reaches 800 amps for less than 10 seconds, handling surge demands from air conditioners, well pumps, and motor starting. Recommended voltage disconnect is 10V. BMS discharge cut off voltage is 10V with reconnect at 10.8V. Short circuit protection activates within 100 to 400 microseconds, faster than standard fuses.

Charge Parameters
Charging uses the CC CV method with charge voltage range of 14.2V to 14.6V. Recommended float voltage at 100 percent state of charge is 13.3V to 13.4V. The recommended charge current is 310 amps for optimal cycle life, while the maximum charge current is 400 amps for extremely fast charging. BMS charge cut off voltage is set to 14.8V.

Cycle Life and Longevity
Rated for more than 8000 cycles at 100 percent depth of discharge while retaining over 70 percent of original capacity (tested at 25°C, 0.5C charge/discharge). For a daily deep cycle application, this battery provides over 21 years of service before reaching 70 percent state of health. The low internal resistance and efficient chemistry reduce heat generation and energy loss.

Temperature Range
Discharge temperature range is -20°C to 60°C, suitable for cold garages and warm engine compartments. Charge temperature range is 0°C to 60°C. Storage temperature range is -10°C to 35°C. BMS high temperature cut off is set to 65°C. For charging below 0°C, external heating is recommended.

Communication and Monitoring
Built in Bluetooth allows wireless monitoring via a smartphone app, showing real time voltage, current, temperature, state of charge, and cycle count. CAN and RS485 ports enable integration with compatible inverters, solar charge controllers, and energy management systems. This makes the battery suitable for advanced off grid systems that require remote data logging and automated control.

Scalability
The battery supports up to 4 units in series, allowing construction of a 51.2V 620Ah bank (31.7kWh) for higher voltage systems. It also supports up to 4 units in parallel, creating a 12.8V 2480Ah bank (31.7kWh) for extreme capacity. When connecting multiple batteries, ensure proper busbars and cable sizing. The BMS is designed for parallel communication to balance charge and discharge among units.

Applications
This 12.8V 620Ah battery is ideal for large off grid solar storage, powering entire homes through the night. It serves as a marine house bank for yachts and sailboats, running navigation, lighting, refrigeration, and entertainment systems. For RVs and campervans, it provides extended boondocking capability. Other uses include telecom backup, industrial UPS, electric vehicle charging buffers, and agricultural equipment.

User Benefits versus Lead Acid
A lead acid bank of equivalent usable capacity would need 1240Ah nominal because only 50 percent is usable. That lead acid bank would weigh approximately 150 to 200 kilograms and occupy significantly more space. Lead acid lasts 500 to 800 cycles; this LiFePO4 battery lasts 8000 cycles. Lead acid requires regular watering, equalization charges, and terminal cleaning; this battery is maintenance free. Over a 20 year period, one lithium battery replaces 10 to 15 lead acid banks.