Fardriver Controller Battery & Smart BMS Selection Guide
Fardriver Controller Battery Sizing Guide
Set Line Current below your BMS continuous rating, not equal to it. Phase current is motor torque current, Line Current is battery current. In this guide 84V means the full charge voltage of a 72V nominal pack, not a separate pack voltage.
Quick answer: Tell us your Fardriver model suffix first. BMS continuous must be above your Line Current setting, with headroom. 84V here is 72V nominal pack full charge, not a separate pack voltage.
Fardriver Controller vs. Battery BMS Specification Matrix
Fardriver ND72360
- Target ApplicationsSur-Ron / Light E-Motos
- Max Controller DC Line120A DC Limit
- Required BMS Rating120A - 150A Continuous
- Recommended CellsSamsung 50G / 50S
- Main ConnectorQS8 Anti-Spark
Fardriver ND72550
- Target ApplicationsSur-Ron, Talaria, QS138
- Max Controller DC Line180A DC Limit
- Required BMS Rating180A - 200A Continuous
- Recommended CellsSamsung 50S, High Output
- Main ConnectorQS8 / QS10 Anti-Spark
Fardriver ND72800
- Target ApplicationsQS138 90H / Heavy EEB
- Max Controller DC Line220A DC Limit
- Required BMS Rating220A Continuous, Set Line Below 220A
- Recommended CellsSamsung 50S Extreme
- Main ConnectorQS10 Anti-Spark, 6AWG
Fardriver ND841800
- Target ApplicationsHigh RPM Race Builds, 72V Nominal Pack
- Max Controller DC Line250A DC Limit
- Required BMS Rating250A Continuous, Set Line Below 250A
- Recommended CellsSamsung 50S Extreme
- Main ConnectorQS10 / Heavy Copper Lug
Recommended Battery Configurations for Fardriver Builds
72V 30Ah / 40Ah, 150A BMS
Samsung 50S cells. For Sur-Ron and Talaria riders upgrading to Fardriver ND72360 for moderate throttle boost. Set Line below 150A.
72V 40Ah / 50Ah, 180A-200A BMS
Samsung 50S cells. Less sag than 50G at the same current under 180A DC Line Current pulls on ND72550 controllers. Set Line below BMS.
72V Nominal, 84V Full, 220A-250A BMS
Steel armor casing with Smart Bluetooth BMS. 72V nominal pack, 84V full charge, for ND72800 and ND841800. Difference is current, not voltage: 220A class for ND72800, 250A class for ND841800. Set Line below BMS.
Fardriver App Setting: Line Current vs. Phase Current
Set Line Current below BMS continuous, not equal to it, to leave headroom.
- Line Current, DC Battery Draw: Set this value below your battery continuous BMS rating, for example 150A to 160A Line for a 180A BMS. Do not run Line at BMS limit continuously.
- Phase Current, Motor Torque: Drives low-speed acceleration. Can be set higher, for example 550A, because phase current does not draw 550A directly from the battery pack.
- Over-Voltage Threshold: Set cutoff to match full charge voltage, 84V max for 72V 20S packs. 84V here means full charge, not a separate voltage class.
Heavy-Duty Anti-Spark Requirement
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, copper lug for 250A plus class.
- Wire: 8AWG up to 180A class, 6AWG for 220A plus class, larger for 250A plus class. Tell us your BMS current when ordering.
- Smart App Telemetry: Monitor live battery MOSFET temperatures alongside Fardriver App diagnostics.
Frequently Asked Questions
Q: Why does my Fardriver controller cut off power during heavy throttle acceleration?
A: Usually Line Current in the Fardriver App is set higher than, or equal to, your BMS over-current threshold, so the BMS trips. Set Line below BMS continuous, with headroom, and check temperature.
Q: Does ND841800 need a different voltage pack than ND72800?
A: No. Both use the 72V nominal pack, 84V full charge, in this guide. ND841800 is a higher current model, 250A line vs 220A, not a different pack voltage. Set Line below BMS in both cases.
Q: Why are Samsung 50S cells recommended over 50G for ND72550 and ND72800?
A: Fardriver controllers make intense initial current spikes. 50S cells hold voltage better at high current than 50G, but total current also depends on parallel count, so check Ah and P count, not just cell model.
