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  1. R

    Thin 52v battery?

    I commissioned a custom frame specifically to build with a bbshd. It is an elevated chainstay fat bike setup so the chain line works with the width of the 100mm bbshd. But the space for the battery was supposed to be 5" to clear the battery I have and it came out just under 4". Anybody know...
  2. R

    NiMH cell reversal

    I went with the trickle charge all day approach. Immediately faulted on start of discharge.
  3. R

    kids bike: minimal assist lightweight pedelec option?

    I guess I'll update this, in case anyone else comes along who is interested. I did a trial with a 20" wheeled "adult sized" ebike (long chainstays, long seatpost.) The bike has a 350w 48v hub motor with 6 assist settings. With it set to setting 0, assist is so vigorous from a stop that it...
  4. R

    NiMH cell reversal

    When a NiMH cell is reversed by overdischarge in series with higher capacity neighboring cells, what happens after recharging the pack? Does this cell act like a resistor in series? Can you get an open circuit? Something worse? Background: I bought a 1g insight with the factory 120S1P NiMH...
  5. R

    Kids ebike

    How is this project shaping up? I'm working on a range extending option for my child. I'd like the assist to be of the sort that melts into her own pedaling. -smooth ramp up -minimal but not negligible assist -no throttle -negligible off delay pedelec function (in technical off road, a few...
  6. R

    kids bike: minimal assist lightweight pedelec option?

    Thank you. I did see that. I wasn't sure whether to add on there or make my own topic. This is a bit different in that the control needs to work for off road, not just neighborhood use. I guess I should have added either tiny mid drive, or cassette freehub and disc brake, as well (I'm not a...
  7. R

    kids bike: minimal assist lightweight pedelec option?

    I want my kid to be able to go on longer rides with me but still have enough energy left at the end of the ride so that she will still be having fun. I think what I'm looking for is: A.) something tunable to less than 100w, maybe with 200w available later as she grows. B.) No throttle. Needs...
  8. R

    Apples to pomegranates? Q100 vs TSZD2 for low speed trail riding

    No direct experience, but a friction drive in a mountain bike application seems like asking for trouble.
  9. R

    Apples to pomegranates? Q100 vs TSZD2 for low speed trail riding

    I have a small amount of relevant experience, and you don't have a lot of replies at this point. I've used the Q100 as a front wheel assist with a tiny battery for a few years. have a little experience with a Nakto, and have just built up a BBSHD100. Is the q100 now available in cassette...
  10. R

    shift sensor

    Chinese shift sensor installed. Definitely made shifting worse. It cuts power when the cable moves, and instantly restores full power as soon as the cable stops moving, basically before the shift starts for upshifts, and definitely before it finishes for downshifts. When I pause pedaling...
  11. R

    How do you size the right Mid Drive?

    Something I didn't see mentioned anywhere, at least with the 860C, holding the minus button is context dependent. When not moving, it activates walking mode, but when moving it activates pause mode, which allows you to shift without power, and then regain power after releasing the button and...
  12. R

    Been away a while... how dumb would it be to buy this?

    Ended up buying a new bike and going with a BBSHD install.
  13. R

    New build: Gravity Monster BBSHD 100mm

    I settled on the gravity monster for it's narrower frame with a bunch of successful fitments out there. I settled on the 100mm BBSHD based on reviews saying it fit this frame without drive side spacers. Mine is a 2021 20" frame. It doesn't clear without spacers. By eye, it looks like it...
  14. R

    Been away a while... how dumb would it be to buy this?

    The bike I want to power is an old bike that has a 135mm rear dropout.
  15. R

    Been away a while... how dumb would it be to buy this?

    I want something to use in the woods only for fun. I'm usually that guy who knows stuff and wants to know more just for fun and is helping other people in the situation I find myself in now. Now I really just want to be reality checked by people who know way more than me on this one. What if...
  16. R

    3 wire Minn Kota 101lb trolling motor

    Yes, i mean the wires from the controller to the motor. I believe these are brushed motors. The 3 wires are heavy gauge red and black and then a lighter gauge light brown wire.
  17. R

    3 wire Minn Kota 101lb trolling motor

    Quick, hopefully easy question... What is the 3rd wire for? I'm building an electric boat for my daughter and planning to use a trolling motor lower unit for assembly expedience.
  18. R

    Oddball motor application question/creative challenge

    I have a special (personal, not professional) project I need help with. I need a DC motor capable of very high torque for short bursts. Ideally, it should be capable of at least 6000w output for 3 seconds at perhaps 70% of no load speed. More watts would be much better. Duty cycle under...
  19. R

    Simple BMS to just prevent high cell voltage?

    I was thinking Headway 38120HP.
  20. R

    Simple BMS to just prevent high cell voltage?

    Anything that achieves some degree of balancing without limiting discharge current or being very costly? Did it look anything like what I described above? I only need 4 cells worth, and with soc being between 60-80% 99% of the time, it doesn't need to be fancy. Other ideas for how to...
  21. R

    Simple BMS to just prevent high cell voltage?

    The important piece of any advice is to understand the why. That is where the value is. I understand why a BMS is important, a good idea, a smart choice. If you can accept that I want to do something that is a bad idea, I would find input into why it might not do what I want it to do very...
  22. R

    Simple BMS to just prevent high cell voltage?

    The disconnect here, if any, has nothing to do with intelligence and everything to do with training and experience. This is far outside of my area of expertise. I didn't say "I'm going to....!". I didn't say the problem was simple. I said I am looking for a simple way to do this. I asked a...
  23. R

    Hobby King LiFePo4

    I'm estimating 72 over the last 16 months. I stopped keeping track at 60. 59 was the day I broke my leg, April 19, 2013. Battery sat at ~75%SoC and room temperature until sometime in October, at which point the balance charge was similar to what it took when using it every day. Average use a...
  24. R

    Simple BMS to just prevent high cell voltage?

    For this application (ice starter battery), charge and discharge must be the same terminals. I was thinking zener diodes in reverse parallel (with appropriate resisters to keep things from burning up). Waste a watt or so anytime an individual cell voltage is above 3.4v to keep things aimed at...
  25. R

    Hobby King LiFePo4

    Update: 4.5 ah rated packs took 2.950 ah to fully charge last charge cycle, and 0.3 ah of that was balance charging. For this depth of discharge, that's about double the balancing required previously. At the start of the discharge cycle, all cell pairs were within the measurement resolution I...
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