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  1. kokopelli314

    Res-Q

    Found the frame behind a local ebike store, seized motor, fried electronics, bearings shot, tires cracked. Pretty much junk. Traded some steel panniers for it. I had the motor from another project and the controller from my trike and rebuilt the 60v Ping pack Worked on it for a week, on and off...
  2. kokopelli314

    PLEASE help me pick from these 3 lifepo4 choices

    Regarding hipower cells and the mysterious "standard discharge" of 6.7A or C/3. After confirming that its not a typo with Kelly at Electric Car Parts Co. we came to the conclusion that this is the current used to generate curve data for the cells. This would probably include peukert and 80%...
  3. kokopelli314

    Techniques to extend batteries in the cold

    To keep the cold from sagging my 60v and 48v Ping packs, I purchased 2 small AC electric heating pads and wrapped the batteries using Velcro strips that stick to the cloth wrap. When the packs start out cold, they can warm considerably under load but will continue to sag during discharge. When...
  4. kokopelli314

    ElectroVelo

    Thanks Patrick. I made it. Ok rough roads. We have a few pooly kept roads here and I've pretty much destroyed two sun sr18 rims 1.5" tires. I've relaced to 3cross on cheapo steel rims and switched to 1.95 and this has improved the ride greatly. The Cane Creek AD12 airshocks are adjusted to about...
  5. kokopelli314

    Single cell LVC and Shunt?

    Just checked out http://en.wikipedia.org/wiki/Charge_pump and saw, pretty much what we"re talking about..i think. So, it seems to me that as a bank is drained, by applying and releasing the throttle, the entire system could be "jiggled" so to speak into active balance. Is this making any sense?
  6. kokopelli314

    Single cell LVC and Shunt?

    That's a good hack. adjusting the charger and all. So bypassing the optoisolators prevents LVC from those groups from triggering pack shutdown?
  7. kokopelli314

    Single cell LVC and Shunt?

    Thanks for that. I checked out the ltc3300 specs and watched a video on the linear technologies site. Very interesting design concept, using neighboring cells to balance through mosfet controlled flybacks. I was wondering how this could be done. Wonder if theres another way? Capacitors and...
  8. kokopelli314

    Single cell LVC and Shunt?

    The cell would be electrically isolated by lifting a terminal. Repairing a Ping pack take an investment of time to unwrap, diagnose, unsolder and resolder, rebalance and rewrap. Not to mention the time required to purchase and ship. I believe that this option is worth investigating
  9. kokopelli314

    Single cell LVC and Shunt?

    Yes Ive repaired my 60v and 48v already. Fortunately replacement cells are cheap. Considering individually bundling groups of 4, 5ah cells to make 20ah batteries that can be easily replaced
  10. kokopelli314

    Single cell LVC and Shunt?

    Yes Dan, that is what I would like do. Simply and automatically remove cell banks that fall below2.2 v and run on the remaining cell banks at a reduced voltage. The bms would be used for charging purposes only. Not for shutting off a pack when a single 4cell bank or cell, whatever, reaches lvc
  11. kokopelli314

    Single cell LVC and Shunt?

    here's my simple idea could this be done with 40a mosfets across each cell?
  12. kokopelli314

    Single cell LVC and Shunt?

    The weakest cell group would be isolated by shunting across. In effect removing it from the pack. After some draw, the next weakest would be removed, and so on. LVC would be first, at cell level, then at perhaps at the controllers setting.
  13. kokopelli314

    Single cell LVC and Shunt?

    Ok so I've been riding a recumbent trike and a velomobile for exclusively for about 4 years. Car-free, by choice. Averaging between 12,000-15,000 km/year. Gone through lots of tires and replaced 5ah pouches in both Ping packs, 60/20 & 48/20. Also replaced the Signalab BMS in each. Even rode the...
  14. kokopelli314

    lifepo4 charger failures... possible cause?

    Thanks Dogman. I'll try this.
  15. kokopelli314

    Using Chassis for Negative Ground?

    If your bike uses a dc-dc converter, you risk frying it by grounding traction power to the chassis.
  16. kokopelli314

    lifepo4 charger failures... possible cause?

    Ok, like so many others I have been plagued with lifepo4 charger failures, related to overheating at the output stages (60v and 48v). Ping has been very good about this and even gave me a replacement. My temporary solution was to use a lower amperage charger and monitor the heat. Last month, I...
  17. kokopelli314

    infineon running HOT

    Yes, I think drmun and neptronix were on the mark. It looks like an impedance mismatch between the sensorless controller and a low impedance motor. # of poles, which equates to frequency would be a factor as well. Leads me to wonder about impedance matching controllers to motors, as even...
  18. kokopelli314

    infineon running HOT

    3548 with Infineon 9 FET sensored @ 48v = Lots of Power
  19. kokopelli314

    infineon running HOT

    9Fet Infineon and 40A Crystalyte get hot as well. Solved the problem by switching to a crystalyte 408, 8 pole motor. Going to try the 23 pole 3548 motor with an infineon and sensored controller @ 48v. Thank You All
  20. kokopelli314

    infineon running HOT

    So 60 volts is just too high for this motor?
  21. kokopelli314

    infineon running HOT

    Forgot to say, that I'm using a Cycle Analyst to limit current. Yes, eratic cogging at startup.
  22. kokopelli314

    infineon running HOT

    Could someone please give me some advise? I have a Lyen, 18 fet sensorless controller with a Clyte 3548. Using a 60v, Ping pack Controller is current limited to 20A with a CycleAnalyst The controller runs HOT! Even when drawing 10A Using a 48v pack, it runs much cooler. I don't want to have to...
  23. kokopelli314

    grunting at start - lyen sensorless

    These are sensorless. There are no halls
  24. kokopelli314

    grunting at start - lyen sensorless

    I have exactly the same problem with an 18 FET controller I purchased from Lyen a month ago. Really bad grunting at startup, under load. Reverse pretty much useless. Baby the throttle and it starts somewhat normally, but start on any grade is impossible. This controller runs very hot as well...
  25. kokopelli314

    New H3548 random cutouts

    Possible, but the cutouts can begin at ~ 4A with the Infineon. I was wondering if the Clyte and infineon firmware may need to be upgraded for these motors. Anyway, Justin has offered a replace/refund, so at least on the sales side things are good.
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