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  1. C

    Experienced Battery Builders Help! - JBD smart BMS random voltage drop from 48v down to 15-17v

    The BMS is a JBD Universal Smart BMS type AP21S001 It can do both LFP and Li Ion and series connections between 6s and 20s Out of the blue, about a dozen times now it decides to stop working. The voltage at the connector ends drops to 15-17v while the pack voltage remains normal at around 50+...
  2. C

    VESC Tuning Advice, Poor Acceleration compared to other controllers

    Anyone with any experience using VESC controllers with DD hub motors please advise! I am building a custom ebike with a 1500w direct drive hub motor. Before the flipsky 75100 that I am currently using, I had a Kelly KLS-S 48v controller on it. Specs on that were are sinewave FOC, 50amp cont...
  3. C

    Hub Motor Axle Nut Tighteness and Corresponding Performance Issues

    I have noticed now after several ebike builds that if I tighten the axle nuts too aggressively then the hub motor seems to have trouble rotating as freely, draws more current, and sometimes even gets very hot while not in use. This seems to indicate some kind of short but I'm not sure where or...
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