This reference covers stock BMS settings for the ONYX 41Ah 72V battery. Identify the BMS variant before comparing or restoring values. These are recorded settings, not the temporary imbalance-recovery configuration.
ONYX 41Ah 72V BMS Variants#
80A BMS
- charge overcurrent: 90000
- discharge overcurrent: 90000
100A BMS
- charge overcurrent: 110000
- discharge overcurrent: 110000
Higher current BMS units provide increased output but increase stress on aging cells.
Connector Limitation Note#
- SB50 connectors limit maximum output
- upgraded connectors (e.g., OSE) reduce restriction
ONYX 41Ah 72V BMS Stock Configuration#
- Total Battery Capacity: 41000
- Total Cycle Capacity: 32800
Capacity Configuration#
| Field | Value |
|---|
| Number of Cell | 20 |
| Total Battery Capacity | 41000 |
| Total Cycle Capacity | 32800 |
| Cell Full Voltage | 4150 |
| Cell Minimum Voltage | 3000 |
| Cell Self Discharge | 0.2 |
| Cell 100% Cap. Voltage | 4150 |
| Cell 90% Cap. Voltage | 4075 |
| Cell 80% Cap. Voltage | 4000 |
| Cell 70% Cap. Voltage | 3900 |
| Cell 60% Cap. Voltage | 3800 |
| Cell 50% Cap. Voltage | 3700 |
| Cell 40% Cap. Voltage | 3600 |
| Cell 30% Cap. Voltage | 3450 |
| Cell 20% Cap. Voltage | 3300 |
| Cell 10% Cap. Voltage | 3150 |
Balancer Configuration#
| Field | Value |
|---|
| Start Voltage | 3900 |
| Delta to Balance | 15 |
| Balancer Enabled (On) | Green |
| Bal. Only When Charging (On) | Green |
Function Configuration#
| Field | Value |
|---|
| SW Switch Circuit Enabled (Off) | Gray |
| Display Celsius (Off) | Gray |
Protections#
| Field | Trigger | Release | Delay |
|---|
| Cell Over Voltage | 4250 | 4150 | |
| Cell Under Voltage | 2700 | 3000 | |
| Batt Over Volt. | 85000 | 83000 | |
| Batt Under Volt. | 54000 | 60000 | |
| Charge Over Curr. | 70000 | 32 | |
| Discharge Over Curr. (80 Amp BMS) | 90000 | 32 | |
| Discharge Over Curr. (100 Amp BMS) | 110000 | 32 | |
| Charge Over Temp | 65 | 55 | 2 |
| Charge Under Temp | -5 | 0 | 2 |
| Discharge Over Temp | 60 | 57.2 | 2 |
| Discharge Under Temp | -10 | 0 | 2 |
NTC Enable#
| Field | Box |
|---|
| NTC1 | Checked |
| NTC2 | Checked |
| NTC3 | Checked |
| NTC4 | Checked |
| NTC5 | Not Checked |
| NTC6 | Not Checked |
| NTC7 | Not Checked |
| NTC8 | Not Checked |
Level 2 Protections#
| Field | Trigger | Delay |
|---|
| Level 2 Overcurrent | 720 | 320 |
| Level 2 Overvoltage | 4400 | 8 |
| Level 2 Undervoltage | 2500 | 8 |
Level 3 Protections#
| Field | Trigger | Delay | Reset |
|---|
| Level 3 Overcurrent (Short Circuit) | 2000 | 400 | 5 |
Stock vs Temporary Recovery#
Temporary recovery and balance optimization remain in the 41Ah battery reference. Restore the applicable stock settings after the documented recovery procedure. Do not combine values from different BMS variants.
