BMS JK-B2A8S30P-HC Setup Instructions
JK-BMS Configuration Guide (B2A8S30P-HC)
This guide is based on the parameters for a 4S LiFePO4 system with a 314Ah capacity. Please be careful: incorrect settings may damage the battery cells.
1. Basic Settings
| Parameter | Value & Recommendation |
|---|---|
| Cell Count | 4. Number of cells connected in series (for 12.8V system). |
| Battery Capacity | 314 Ah. Set your actual battery capacity for accurate SOC (State of Charge) calculation. |
| Balance Trig. Volt | 0.010 V. The balancer activates when the voltage difference between cells exceeds 10mV. |
2. Voltage Protection Settings
| Cell OVP / OVPR | Protection: 3.600V / Recovery: 3.500V. Safe upper limit for LiFePO4 cells. |
| Start Balance Volt | 3.40 V. Balancing starts only during the end of the charging phase for better efficiency. |
| SOC 100% / 0% Volt | 100% = 3.550V / 0% = 2.900V. Voltage reference points used to calibrate the fuel gauge. |
| Cell UVP / UVPR | Protection: 2.800V / Recovery: 3.000V. Low voltage discharge protection. |
| Power Off / Smart Sleep | 2.700V / 2.500V. Critical levels where the BMS shuts down to prevent self-discharge damage. |
3. Current & Protection Settings
- Max Balance Curr: 2.0 A. High-power active balancing for 314Ah+ cells.
- Continued Charge Curr: 150.0 A. Maximum allowable current from the charger.
- Continued Discharge Curr: 300.0 A. Maximum continuous load for your inverter.
- SCP Delay (Short Circuit): 5 µs. Ultra-fast short-circuit response for hardware safety.
4. Temperature Protection
| Charge UTP (Low Temp) | 5.0 °C. Prevents charging LiFePO4 cells in freezing conditions. |
| MOS OTP | 75.0 °C. Protects the internal BMS power MOSFETs from overheating. |
| Discharge UTP | -5.0 °C. Lowest allowable temperature for discharging the battery. |
5. Balance Wire Resistance (Con. Wire Res.)
This section (Con. Wire Res. 01-08) shows the internal resistance of the wires from the BMS to each cell.
Recommendation: All values should be close to 0.00 mΩ or identical. If any value exceeds 10-15 mΩ, check the terminal connections for tightness or oxidation.
* After changing any parameter, you must press the "OK" button next to it to save the settings to the BMS memory.
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