High Capacity 620Ah Lithium Battery 12.8V with Bluetooth CAN RS485 for Solar Marine RV

High Capacity 620Ah Lithium Battery 12.8V with Bluetooth CAN RS485 for Solar Marine RV

Massive Power for Demanding Applications
This 12.8V 620Ah LiFePO4 battery stores 7936 watt hours of energy in a rugged IP65 rated PPE enclosure. With 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.

Power That Keeps Going
This battery delivers 400A continuously—enough to run a 5000W inverter or a whole cabin full of appliances. When a well pump kicks in or an air conditioner starts, it handles 800A surges for up to 10 seconds without breaking a sweat. The BMS cuts off at 10V and reconnects at 10.8V, while short‑circuit protection fires in 100‑400µs—faster than most fuses.

How to Recharge It Fast
Feed it 14.2‑14.6V via CC‑CV charging. For daily use, 310A is the sweet spot to maximize life; if you’re in a hurry, crank it up to 400A and get back to full power quickly. Float at 13.3‑13.4V when you’re at 100%. The BMS guards the top at 14.8V.

Built to Handle the Extremes
It works from -20°C to 60°C when you’re drawing power, and charges from 0°C to 60°C. Store it between -10°C and 35°C. If temperatures drop below freezing, add an external heater for safe charging. The BMS shuts down at 65°C to protect the cells.

Smart Monitoring, No Guesswork
Bluetooth connects to your phone for live voltage, current, temperature, and SOC—plus a running cycle count. CAN and RS485 let your inverter or solar controller talk to the battery, so your whole system runs smarter.

Grow with Your Needs
Need higher voltage? Put four in series for a 51.2V, 620Ah bank (31.7kWh). Need more capacity? Parallel four for a 12.8V, 2480Ah monster (also 31.7kWh). The BMS handles parallel communication to keep everything balanced.

Why It Crushes Lead Acid
A lead‑acid bank with the same usable capacity would need 1240Ah nominal (only 50% is usable), weigh 150‑200kg, and last just 500‑800 cycles. This lithium battery weighs 55kg, lasts 8000 cycles, and asks for nothing—no watering, no equalizing, no terminal scrubbing. Over two decades, you’d buy 10‑15 lead‑acid sets; with this one, you buy once.

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.