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  1. S

    Low Voltage Cutoff

    I used to think that LVC would manifest itself as follows: as soon as a battery's voltage output dropped to the LVC voltage, the controller and/or BMS would cut off power from the battery and you could not use the battery until you charged it above the LVC voltage. But in fact, recent...
  2. S

    lithium battery aging/degradation

    As a lithium battery ages/degrades, I assume this means that it will hold less Amp hours (e.g a 10Ah battery when new might only hold 9.1Ah after some time/use). But is there also a decrease in operating voltage? For example, I have a 36V Lithium Polymer battery. Its about 1.5 years old and I...
  3. S

    logicstics of non-standard voltages e.g NOT 24/36/48/72V

    For those of you who are using non-standard voltages (say 60V or 66V or 88V), I am curious about 2 things: 1) what controller are you using? e.g. if you are running 60V, do you use a 48V controller and just hope that it can take the higher voltage? 2) how are you charging your battery(s)? e.g...
  4. S

    convert immediate start controller to pedal-first?

    Is there any way to easily convert an "immediate start controller" to "pedal-first" ie sensorless? ie could it be as simple as unplugging the hall effect sensor wires in the controller? You're probably asking "why the heck would anyone want to do this?" well, say I've got a broken hall effect...
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    mixing different battery types/voltages

    My understanding is that if you use multiple batteries in series, they should have the same amp hours. I think I know why but can someone provide clarification? But what about using batteries with different amp hours in parallel? ie say you have 2 Lithium batteries: a 10.5Ah battery and an 8...
  6. S

    406 vs 408

    I currently have a Crystalyte 408 rear motor but due to several problems, I am considering buying a new one. I think I'd like to stick to a 400-series motor and I'm hoping to get feedback/considerations on what winding count to buy ie 406 or 408. Here's my parameters: 1) I weigh about 160lbs...
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    icon legend

    Is there a legend anywhere which describes the various icons (to the left of every topic post)?
  8. S

    broken controller questions

    Awhile back, my Crystalyte 36V 20A controller stopped working. I'm not exactly sure why although my LBS suspects water got into it. Anyway, one thing I noticed is that, if the controller switch was "on", even without the battery, when I turned the wheel, there was an incredible amount of...
  9. S

    motor making jerking/rattling noise

    Help please! I have a Crystalyte 408 rear hub setup (36V Li-Ion battery). Recently I damaged the wires leading into the motor. So i opened it up and soldered the wires. I put everything back together and everything seemed to work for awhile. But then yesterday, the motor started making a...
  10. S

    controller design

    My understanding of how ebike controllers work is that there's a rotational speed target (of the wheel) "wt" that linearly depends on battery voltage "vbat" and modulation index "x" (0 to 1, controlled by throttle position): wt=k1*(x*vbat) My understanding is that one of the implications of...
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