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zoomr

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About zoomr

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  1. zoomr

    Tesla 84v Controller

    My core question is determining if a higher current cell like a Sony VTC6 might be advantageous over the Gotway standard Sanyo 18650GA in terms of both safety and usable capacity due to the lower resistance/voltage drop. My use case would be a Gotway Tesla 84v 1020Wh, 1900?/2000?W motor, shooting for average speed around 20mph and no more than 25mph. Based on the following info, it would seem that at a 10W continuous discharge/cell (800W total for the Tesla 84v 1020Wh) that usable capacity (down to 3.4v or ~10%) is approximately equal. Presumably the VTC6 would retain more usable capacity at >10W discharge/cell. https://lygte-info.dk/review/batteries2012/Sanyo NCR18650GA 3500mAh (Red) UK.html https://lygte-info.dk/review/batteries2012/Sony US18650VTC6 3000mAh (Green) UK.html
  2. How does this relate to nominal and peak motor output? Aren't the batteries and mosfets capable of delivering more power instantaneously than the motor can use for motion? Therefore the limiting factor would be the motor rating? Sorry for hijacking this thread @Chaz Witt
  3. @mrelwood It also occurs to me that there is no mention of the voltage cut off in Titan's testing. As you probably know Gotway's 10% mark is ~3.4v with full discharge ~3.3v. Based on the info from the source I mentioned earlier, the VTC6 seems superior even down to a 10W draw per cell or 1200W from a 120 cell battery. Am I missing something? https://lygte-info.dk/review/batteries2012/Sanyo NCR18650GA 3500mAh (Red) UK.html https://lygte-info.dk/review/batteries2012/Sony US18650VTC6 3000mAh (Green) UK.html
  4. What is the maximum continuous current that this controller can handle? The MOSFETs are labeled as 100v, but I can't find any information about the controllers ability to handle current.
  5. @mrelwood Thanks for the link, that provides some good context. The important consideration seems to be the capacity of your batteries. For example, a Tesla with an 84v, 1020Wh, 80 cell battery would hit the "threshold" at 1600W, well below its 1900W nominal motor rating. You certainly have more knowledge about this than me: What exactly is the limiting factor for EUCs? I'm sure this is make/model specific, but I would think it has to be peak motor output or temperature somewhere in the system.
  6. I'd love to see the flip side of these series units if you have a picture. Could one swap out the cells and salvage the PCB? I think Sony VTC6 cells would actually provide more USEABLE capacity (10% @ ~3.4v/cell) and a higher margin of safety (due to the 15 amp continuous discharge rating) especially for aggressive/high speed riders. Source: https://lygte-info.dk/info/batteryIndex.html
  7. @alcatraz they aren’t guaranteed to be “Tesla” batteries just because they’re 21700s right? That’s what I was getting at. If they are used Tesla batteries I’d be interested to know how used. If they aren’t, I’d be interested to know the cells make/model.
  8. @Terzo@alcatraz any indication about the condition/make and model of these 21700 batteries?
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