question

I have a 24V 260 amp alternator charging AMG batteries.

Bestgo Lithium Batteries.

I am using the lower SET Rate: 28.8V

Charging Voltage: < 29.2 V at CC/CV charge mode (Can be charged to 28.8V for longer cycle life.)

8 Each

5.12kW Preferred 24V 200Ah Lithium Battery Can Be Paralleled 5 Year Factory Warranty 3000 Charge Cycles 150A Maximum-Continuous 17.0"L * 10.5"W * 10.0"H - 89 Lbs.

Batterie Specifications:

Chemistry: Lithium Iron Phosphate (LiFePO4)

Battery Pack Dimension (L*W*H) and connector type: 17 * 10.5 * 10 in. (432 * 266 * 254mm) (metal case size)

Red and black terminals with M8 screw hole. Terminals have 18mm height above case.

Battery Pack Weight: 89 Lbs. (40.5 Kg)

BMS and Fuse: PCB BMS and fuse are built inside case. The fuse is 250A slow type.

Rated Capacity: > 200 Ah at C/3, 73°F (23°C) (Measured as 2.5V cut off at cell level)

Operating Voltage: 25.6 V (average) at C/3, 73°F (23°C); Working voltage range is 29.2 ~ 20.8 V

Charging Voltage: < 29.2 V at CC/CV charge mode (Can be charged to 28.8V for longer cycle life.)

Discharge Cut Off Voltage: 20 ~ 20.8 V (When any cell's voltage reaches 2.5V this protection will be triggered) (Set device (like a controller) low voltage protection much higher to avoid triggering this protection.)

Maximum Charge Current: < 100 A at 60 min, 23°C, 20%< SOC <70%; < 200 A at 5 min, 23°C, 20%< SOC <70% (Please consider heat accumulation inside pack if charging with a large continuous current.)

Maximum Discharge Current: < 200 A at 30 min, 23°C, 30%< SOC <100%; < 400 A at 15s, 23°C, 30%< SOC <100% (Please consider heat accumulation inside pack if discharging with a large continuous current.)

Battery Cycle Life: > 3000 times at 80% DOD, C/3, 23°C (After test it can deliver > 75% rated capacity.)

Internal Resistance: 10 milliohms (DCIR test method, at 10s, 50% SOC)

Temperature protection for charging process: 0 ~ 5 °C < Sensor for cell < 65 ~ 70 °C (If inside sensor detects a temperature that is outside of range, the BMS will shut the pack off.)

Temperature protection for discharging process: Sensor for cell: < 65 ~ 70 °C (If inside sensor detects a temperature that is outside of range, the BMS will shut the pack off.)

Surrounded working condition temperature: Charge: 41 ~ 113°F (5 ~ 45°C); Discharge: -4 ~ 131°F (-20 ~ 55°C) (Suggested for charging: 50 ~ 104°F (10 ~ 40°C); Suggested for discharging: 14 ~ 113°F (-10 ~ 45°C)

Storage Temperature: 14°F ~ 104°F (-10°C ~ 40°C) (for < 3 months) Keep SOC at 40~60% for long term storage.

Note: Inside the battery pack, the temperature sensors are attached to both the cells and the BMS. However, the temperature measurements are not very accurate. As a result, the BMS may trigger protection in a specific temperature range. Due to a passive cooling design which does not have a fan for cooling, please consider the heat accumulation inside the pack. When in a hot temperature please do not charge or discharge the battery pack with a big constant current, it may trigger temperature protection.

I very much would appreciate your help.

Sincerely

Dave Vern

If interested pictures of this project can be viewed on Instagram.

Under: dave.vern