• Howdy! we're looking for donations to finish custom knowledgebase software for this forum. Please see our Funding drive thread

Search results

Date Relevance Most replies

  1. A

    Field trip to powervelocity a.k.a. Vad's house.

    Hi all, I like vector and really enjoy my vector/adaptto bike, but I was intrigued by powervelocity's inexpensive Bluetooth enabled sine wave controllers. And as luck would have it he lives near my dad in Sacramento California so I stopped by to say hello, and take his controller (and entire...
  2. A

    recomendation for a 75v-->12v buck converter?

    hi all, I stepped up my voltage from 48v to 66-75v and need a good buck(step down) converter to get the voltage down to useable levels-12ish volts. All the pre-made modules I can find top out at 60v, anyone know a good one that can handle higher input voltages?
  3. A

    Melted a ebikekit mini-hub motor-2500watts cont.

    for those wondering what a mini geared motor can do,I took the 350 watt model from ebike kit, mated it to a basic controller set to 2500 watts max, and ran it for a few weeks with no issues in 10 minute intervals, typical speed to 30mph, brake to stop sign usage, with one 800 ft hill climb at...
  4. A

    Surly ogre build is great

    Hi guys, I bought a used surly ogre this weekend to use as an ebike. It's great. I was worried the horizontal dropouts would be difficult, but they are fine. I did have to stretch the frame a few mm to fit the wheel, but I did it by hand, no tools, just pull and shove motor in. The best part...
  5. A

    2015-egolf owner-AMA

    Hi guys, brought home the e-golf for wifes commute. I love/hate it. if anyone is thinking of buying one, feel free to ask questions. for starters, the software is horribly broken for timed charging.
  6. A

    Back from 3 year hiatus-Good 29er recommendation?

    Hi guys! I"m getting back into the ebikes. I stopped riding for a few years. Long story short, newborn+ wife in gradschool=no time for bikes. She's graduated, and he's old enough to ride his own bike now- I did keep riding a regular bike, but new commute has me rushing to pickup kid. I've got a...
  7. A

    How to Kill LiMn- Or, the devils review of Konions

    Hi guys, I've done over a year of LiMn testing on bosch fatpacks. and now, not one pack works at all. I know DrBass says their bulletproof, and he's mostly right, but even they have their limits. for about a year I rode various configurations of 6 fatpacks. 1. the sag hammer- one pack...
  8. A

    Mixing C ratings, in series or parellel?

    Hi guys, I have 4 6s5ah turnigy 30c rated packs, and a friend gave me 4 more 6s5ah packs, with about a hundred cycles, but only the 20c rated packs. I want to make a 24s10ah pack out of all 8, would it be better to build a 12s10ah pack rated 20c, and a 12s10ah pack rated 30c, then put those...
  9. A

    replacing 20c lipo cell with 40c?

    Hi guys, I'm replacing a badly puffed cell in a 6s string, and they are out of 2s, 3s, 4s of the AH I need. I bought a 2s 40c pack to use as replacements. the impedance should be lower on this cell then the others, what effect will this have on the pack, by having one 40c rated cell, and the...
  10. A

    2 free Gem cars near San francisco

    Hi all, 2 free Gem cars, http://sfbay.craigslist.org/pen/zip/2348252386.html if anyone is interested
  11. A

    Anyone used HK B grade lipo?

    Hi guys, Has anyone used the Hobbyking B grade Lipo for anything? I'd never use it for a ebike, but I was thinking of picking up a 3s 40c 2.6 ah pack to use as a booster pack for my car, and maybe a 6s pack to replace a dead drill battery. it says they have hi internal resistance, which makes...
  12. A

    BMC freewheel collar failure

    Hi all, I tried to pull the freewheel off my BMC motor, and really torqued down on the freewheel pull tool. but the collar the holds the bearing and the feewheel decided to slip on the cover plate instead. Ouch. My plan is to cut into both the steel colar and alum plate and put little...
  13. A

    Life-lipo hybrid pack

    Hi guys, I was wondering if anyone had tried a lifepo4/lipo hybrid pack. my thinking was a 36v 5ah nan-tech pack for low resistance, hi-amp draw coupled with a 36v lifepo4 ping type pack, say 20 ah, for range. and since voltage sag is a function of resistance, under heavy load, what...
  14. A

    infineon controller cuts out over 10 amps?

    Hi guys, I have one of Lyens infineon based controllers and I blew something. when I hit the throttle, i'm fine up to 10 amps, after that it cuts out, then I have to completely back off the throttle to get it to work again, hit 10 amps, lose the throttle, rinse, repeat. Now, I know it's not...
  15. A

    BMC v4 motor?

    Anyone else know anything about this? did a search for v4 and came up with nothing. http://ebikessf.com/node/143 I think the coolest thing about is the wiring not routing through the axle, that will let way more power into the motor.
  16. A

    What's in your toolbox?

    Edit: this post was too narrow, I'm expanding it. Hi, I realized I spend $40 on a Anderson crimper, but I'm still stripping wire with my teeth. What's a good wire stripper? Better yet, what do you guys think are "must have items in your toolbox. for me it's the crimper, Shrink wrap, lots...
  17. A

    charging 18s with 3s lipo chargers?

    I just wan to verify that this will work before I buy it all: 12vPS 12vPS 12vPS | | | 6sCharger 6sCharger 6sCharger + - + - +...
  18. A

    How many amps can a AA Nimh cell put out?

    I asked myself this question earlier today as I had recieved 70 of them from my old office. They might make for a cool booster pack, or some other foolishness. But how many amps can they handle? turns out, no one knows. Or at least I can't find it on the net anywhere, so, I tested them out...
  19. A

    Ultra Low budget Lipo test setup

    Hi guys, time for me to get into Lipo. My commute is 1.1 ah each way, and I pull 72v/50 amps for about 10 secs during the first climb. To test the lipo waters, I got a 6s charger Hobbyking brand, laptop powersupply at 16v, 7.5 amps, and 3 turnigy 2.6ah 20c packs. The total price was...
  20. A

    advice on a123 25s1p pack

    Hi guys, my commute ends with a nasty hill, 20% grade or so for 2 blocks, which I hate. I've been commuting with a 6.6 ah 72v pack, but I'd like to go smaller and was thinking of building a 1p a123 pack to do the task, and was wondering what I can expect from the cells in this usage scenario...
  21. A

    ripped battery tab+conductive silver epoxy

    Just thought I'd share my experience with a ripped tab on a 10 AH Lifepo4 cell, hidden under a soldered on BMS. it was totally impossible to reach, but with the help of some silver conductive epoxy I got it fastened back together and running. I wasn't sure about the epoxy but there's no heating...
  22. A

    battery build, 24s12p lipo advice

    Hi guys, I just picked up 288 cells http://endless-sphere.com/forums/viewtopic.php?f=31&t=21158 of 2ah lipo and now I'm faced with the daunting task of making a pack out of them. the cells are prismatic foil packs, all unused sitting on their trays at 3.7-3.8v. They have nice long tabs on...
  23. A

    How to lower LVC on Ecrazyman controller?

    Hi all, New bike is awesome, but the LVC on the E-crazyman 72v controller appears to be to high. the bike all but loses power at 73v. It might be due to voltage sag on the 4.4 ah battery pack, but either way I'd like to set it LOW, like 30v, in case I want to run on lower voltage batteries for...
  24. A

    72v folding bike=wheelie time

    this is my 72v, 30a, 20" folding bike for commuting on the subway here in san francisco(folding bikes only during rush hour) I wanted something with more torque than my 48v BMC build, and boy did I get it, a quick test drive shows the biggest problem is uncontrollable wheelies! :mrgreen...
  25. A

    overvolt Trolling motor

    Hi guys, Anyone know if it's possible to overvolt an el-cheapo minn kota trolling motor? there are 12v ones out there for ~$100, but I'd like to use my 48v or 36v lipo with the motor, and it would suck to just fry it...
Back
Top