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  1. flyingbeekeeper

    Recommended sources for controllers

    I've been on Endless sphere for many years. But I've been gone a while, and have a bad 48v controller I need to replace. Who is a trusted source now? I picked a 48v controller off amazon that was crap. And I've spent too much time in the threads trying to find trusted suppliers. Who do you...
  2. flyingbeekeeper

    Brushless 350W Motor Stuttering and Screaming - New Build

    Just installed a new motor and controller. Found the right phase combo, Wide open throttle draw at .8 Amps, minor noise on startup. But when going 15-20mph and I hit the throttle hard, the motor makes a terrible NOISE (pedestrians will turn their heads at the sound), chokes, suddenly gets...
  3. flyingbeekeeper

    Soliciting input on designing an ebike for production

    OK, first I should introduce myself and why I have to ask this of the EV group. I've built ebikes for ~10 years ever since I put on my first Wilderness Energy brushed motor kit. I've got 5 bikes in my stable with 3 kits on them. I'm an electrical engineer with scars on my body from testing...
  4. flyingbeekeeper

    Battery bank cratered to 0.02v

    OK, so after 3 days, all but 3 cells fell below 4.0v after charging each individually. So the bank really needs to be replaced. If anyone else reads this thread because of similar circumstances, assume the entire bank is bad and replace.
  5. flyingbeekeeper

    Battery bank cratered to 0.02v

    nope. 1/3 of that pack was ultimately damaged and it was decommissioned.
  6. flyingbeekeeper

    Battery bank cratered to 0.02v

    The .3 v is when the bank got rid of the vampire cells and drifted up. Once charged they get above 4.v
  7. flyingbeekeeper

    Battery bank cratered to 0.02v

    So I had a 13s13p homemade battery have a bank crater to 0.2v after a over discharge event that took other banks down to 2.5v. Bank #1 went down to 0.02 (not 0.2) and would not come back up with charging. It because obvious that a no-name pair of cells in it were hot so I removed them...
  8. flyingbeekeeper

    Is there a kit out that has built in amp-hour meter?

    Yes I can, and I can't use a CA for this project. Have to find a far small, covert amp-hr meter.
  9. flyingbeekeeper

    Is there a kit out that has built in amp-hour meter?

    From my research, I'd say no. Yea, I'm aware the latest display from Bafang BBS02 has a watt meter, but not a watt-hour meter.
  10. flyingbeekeeper

    Overcharged 18650 battery pack - now what

    At this point, I cracked open the pack and tested all cells in groups of 2 or 3. The very old cells that are 5+ years old took the most 'damage' meaning a reduced capacity. It became clear that certain brands and models took the worst brunt. After a while, I realized that all the light green...
  11. flyingbeekeeper

    New Bafang Crank-Drives

    Or we could start a 'best practices for Bafang' thread that search could find!
  12. flyingbeekeeper

    New Bafang Crank-Drives

    Thanks tommie! I still think we should start a thread of 'best practices maintenance' for the Bafang and put this in there.
  13. flyingbeekeeper

    New Bafang Crank-Drives

    I'm beginning to get a faint squeaking sound from the drive under load. I'm at 750 miles on it, and I barely remember reading somewhere in the last 170 pages of this thread about using high quality grease to do occasional maintenance on the drive. Is there a thread I'm missing on best...
  14. flyingbeekeeper

    Overcharged 18650 battery pack - now what

    For those who want to know more of what I've found, in the event they also have overcharged a pack- After draining the pack to 50% SOC and then charging/balancing, I then drained to 90% SOC and balanced twice. I charge/balance to 4.15v. It now becomes apparent that one bank will not stay...
  15. flyingbeekeeper

    Overcharged 18650 battery pack - now what

    Yep, all 13 cells were at or about 4.59. Except bank #3 that is a little weak, it was 4.54. I just got back from a 9 mile ride on the battery, there was a hell of alot of capacity over 4.4v. Far more than I expected. My beliefs were that there was going to be alot of surface charge, but that...
  16. flyingbeekeeper

    Overcharged 18650 battery pack - now what

    Yes, I do have watt meter specs for that pack. The 17ah pack is normally run at 0.75C-1C, and peaks of 1.4C which is a tad higher than it should be run. (recycled 18650 packs should be run 0.5C cont, 1C peak) I'll be using my misfortune to document what happens and post what I find here...
  17. flyingbeekeeper

    Overcharged 18650 battery pack - now what

    What signs am I looking for on venting? Do they expand? Do they vent out the positive tip side? Or at the seam on the side? Will I see a white goo like alalines?
  18. flyingbeekeeper

    Overcharged 18650 battery pack - now what

    Whoops, used the wrong charger on my homemade 18650 pack. About 17ah 13s9p made from recycled 18650s. The cells accidentally charged to 4.59v. Likely spent 2-4 hours overcharged. The entire pack got warm which is unusual for it. My first instincts was to put a 1amp load on it and bring it...
  19. flyingbeekeeper

    48V 18650 configuration

    I've been using a 13s9p 18650 pack for my Bafang BBS02 750W motor on my folding bike for several months now. I live in Austin, which makes Oslo look flat. If you watch your gearing, high amps is only about 18amps, on a 20 degree hill in 1st gear. Normal biking conditions, the battery is...
  20. flyingbeekeeper

    Homemade Battery Packs

    Very interesting! Good science and effort! I noticed you changed 2 variables and not just one. It would be quite interesting to find out if it is the discharge or the charge rate that has the most influence on lifespan.
  21. flyingbeekeeper

    Cordless Tool Conversion

    So I had 2 cheap drills who's packs were dying and I converted them over to 18650s because I had some spares from a pack built (see Homemade Pack thread) And I posted a thread about a dangerous voltage inversion on one of the 18650s that I pushed too hard, at which point it devolved into a tool...
  22. flyingbeekeeper

    Dangerous 18650 battery voltage inversion

    And I raise you one. 5s6p external pack worn in a hip pouch. Used 18ga wire that gets hot (oops), but I'll fix that next week. Runs my sawsall really well and is now worthwhile to use clearing brush. Added balance leads and used the sub 4.15 cells that aren't worthy of the bike. I probably...
  23. flyingbeekeeper

    Dangerous 18650 battery voltage inversion

    I like.
  24. flyingbeekeeper

    Homemade Battery Packs

    That does bring up another question. Should there be a layer of insulator between each bank? Perhaps duck tape or clear packing tape? I didn't see any on Drkangels, is it there? Also, is there a reason to build packs tightly and stack batteries in diamond fits to get the most batteries in or to...
  25. flyingbeekeeper

    Homemade Battery Packs

    Here's one for DrkAngel - I'm on my 3rd battery build, and the more I've built, the more I realize how little I know. My question is this - after I charge up the cell initially to do the self-discharge test and wait a week, what gradient levels do you set for the results? for example - I...
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