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  1. S

    Low Voltage Cutoff

    thanks for the replies all. Anyone know what LVC is on a typical Crystalyte 20A max controller? For that matter, is there a typical BMS LVC for 36V Lithium batteries?
  2. 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...
  3. 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...
  4. 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...
  5. S

    Demographics?

    37, wife, 1 kid. Got into ebiking to: 1) commute to work 11km and not have to shower (and also get there a bit faster than on a non-motorized bike) 2) get exercise on the way home from work 3) save $ on gas/parking/maintenance for car work for the government as a Senior Operations Analyst...
  6. S

    406 vs 408

    thanks to all of you for your feedback
  7. S

    convert immediate start controller to pedal-first?

    oh well. thanks nutsandvolts
  8. S

    406 vs 408

    I've thought about adding 12V (10 Ah) Lithium (either LiFePO4 or LiPo) but I've never seen any batteries less than 24V for sale. Can you tell me where I could find one? Of course, another cost to getting a new 12V Lithium battery would also be buying a 12V charger although I would think that...
  9. 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...
  10. S

    406 vs 408

    Hi Ypedal, Why is it called a "36V" controller if it can be used at 48V? (there has to be a catch e.g. increased risk of burnout) Hi Dogman, I think a 407 would be a good compromise but so far I haven't been able to find one for sale. And yes, right now, I just want the motor (not enough $...
  11. S

    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...
  12. S

    406 vs 408

    Thanks for the reply Ypedal. Unfortunately, I am somewhat constrained financially. I currently have a 36V controller so if I were to follow your suggestion then, in addition to buying a 12V battery, I would also have to buy a higher voltage controller.
  13. 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...
  14. S

    icon legend

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

    motor making jerking/rattling noise

    hmm, I believe it was the yellow and green "phase wires" that were damaged (see attached picture). I soldered the wires and put black electrical tape over the soldered sections. In the picture, the yellow wire has a 2nd exposed section where I figured the wires were mostly intact so I ended...
  16. S

    Safe to ride with 1 broken spoke?

    On a related note, my rim has 3-4 spots where the spoke tension was too tight and it has started to crack a bit (see http://www.ebikes.ca/troubleshooting.shtml - item 6 - Cracked Rims from Overtight Spokes). how big a deal is this?
  17. S

    motor making jerking/rattling noise

    Thanks icecube57. One further question: assuming it is a hall effect sensor problem, any thoughts on why the problem does not happen at wheel speeds below 10km/hr?
  18. S

    broken controller questions

    Thanks icecube57, can you point me to a tutorial about testing/replacing mosfets? (I don't even know what a mosfet looks like)
  19. S

    broken controller questions

    Hi dnmun, Sorry, I realize I posted the facts incorrectly. Ignore my first post. So to start again, The battery is disconnected. If I connect the cable with the "rectangular" connector (the one with 3 flat leads), from the controller to the motor and spin the wheel, there is huge...
  20. 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...
  21. S

    motor making jerking/rattling noise

    Hi icecube57, Can you elaborate a bit on how to do this/equipment required? (I am a relative newby to electronics - the soldering job I did was my 1st). To be honest, I'm not clear on what a hall effect sensor looks like (and which wires from the controller are for the hall effect sensors)...
  22. 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...
  23. S

    controller design

    hey fechter, Just to confirm my understanding, is one of the implications of how the system works such that, the faster you go, the less you will drain your battery? (seems unintuitive) ie the faster the wheel spins, the more the back emf rises and thus the less current that can be sent from the...
  24. S

    controller design

    thanks for the prompt reply fechter. that makes sense.
  25. 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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