Sabvoton & VESC Controller Battery Selection Guide
Sabvoton & VESC Controller Battery Sizing Guide
Size battery current to controller battery current first, and set regen to BMS charge limit, not discharge limit. A 75V-max VESC does not accept a 72V nominal pack at 84V full charge.
Quick answer: Tell us your controller model and its max voltage label first. Battery Current Max must stay below BMS continuous, with headroom. Regen must stay below BMS charge limit. 75300 max is 75V, do not use a 72V nominal pack on it.
Sabvoton & VESC Model vs. Battery BMS Specification Matrix
Sabvoton 72150 (FOC)
- Target ApplicationsQS205 / MXUS 3K Hubs
- Max Controller DC Draw150A DC
- Required BMS Rating150A - 180A Continuous
- Max Regen Charge Current40A - 60A Regen, Below BMS Charge Limit
- Recommended ConnectorQS8 Anti-Spark
Sabvoton 72200 (Unlock)
- Target ApplicationsStealth Bomber / Heavy Hubs
- Max Controller DC Draw200A DC
- Required BMS Rating200A - 220A Continuous
- Max Regen Charge Current60A - 80A Regen, Below BMS Charge Limit
- Recommended ConnectorQS8 / QS10 Anti-Spark
VESC 75300 (75V Max)
- Target ApplicationsHigh Speed Race / DIY E-Motos
- Max Voltage75V Max, Do Not Use 72V Nominal Pack
- Max Configured DC Draw180A - 200A DC
- Required BMS Rating200A Smart Bluetooth BMS, Set Below 200A
- Telemetry ProtocolUART / CANbus / App
- Recommended CellsSamsung 50S Peak
VESC 84450 / 84550
- Target Applications20kW+ Extreme Speed Builds
- Max Configured DC Draw250A DC Limit
- Required BMS Rating250A Continuous, Set Below 250A
- Max Regen Charge Current80A - 100A Peak Regen, Below BMS Charge Limit
- Recommended CellsSamsung 50S Extreme
- Max Voltage CheckOnly If Label 84V Or Above, Full Charge
Recommended Battery Configurations for FOC Controllers
72V 30Ah / 40Ah, 150A-180A BMS, Check P Count
Samsung 50S cells. 30Ah tier uses 150A class, 40Ah tier uses 180A class, for Sabvoton 72150 driving QS205 hub motors. Less sag than smaller Ah at the same current.
60V 40Ah / 50Ah, 200A Smart BMS
Samsung 50S cells with Smart Bluetooth BMS. 16S pack, 67.2V full, for VESC 75300 only. Do not use a 72V nominal pack on 75300, 84V full exceeds 75V max.
72V Nominal, 84V Full, 250A BMS
Steel armor pack with 250A BMS. 72V nominal pack, 84V full charge, for controllers whose max voltage is 84V or above. Heavy regen must stay below BMS charge limit.
Regenerative Braking Current & BMS Protection
Regen limit is BMS charge limit, not discharge limit. Check your BMS charge spec first.
- Regen Battery Current, Battery Current Max Regen: Set this in VESC Tool below your Smart BMS continuous charge limit. Do not set regen to discharge rating.
- Preventing Over-Voltage Trips: Avoid hard regen on a 100 percent fully charged pack, regen can push voltage above cutoff. Leave headroom at full charge.
- Low Internal Resistance: Samsung 50S cells absorb regen energy with less heat than 50G at the same current.
Anti-Spark Connectors & Pre-Charge Requirements
Match connector and wire to BMS current, not just to controller brand.
- QS8 Anti-Spark: Up to 180A class.
- QS10 Anti-Spark: For 220A plus class.
- Wire: 8AWG up to 180A class, 6AWG for 220A plus class. Tell us your BMS current when ordering.
- Smart BMS App Telemetry: Check cell voltages, balancing, and temperature in real time.
Frequently Asked Questions
Q: How do I configure Motor Current Max vs Battery Current Max in VESC Tool?
A: Motor Current Max is low-speed motor torque, for example 350A to 450A. Battery Current Max is actual DC power from the battery. Set Battery Current Max below your BMS continuous rating, with headroom, not equal to it.
Q: Why does my Sabvoton controller trip when applying electronic brakes (E-Brake)?
A: Usually E-Brake current is set higher than your BMS charge protection threshold. Set E-Brake below BMS charge limit, not discharge limit, or use a BMS with higher charge limit.
Q: Can I use a 72V nominal battery pack on a VESC 75300?
A: No. 72V nominal pack full charge is 84V, above 75300 max 75V. Use a 16S pack at 67.2V full. For 72V nominal packs, use a controller with max voltage 84V or above, check label first.
