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  1. R

    How does low batter voltage cutoff work? 48v to ??-cutoff

    higher voltage isnt necessarily more capacity. think of it like two pipes of different widths. the wider pipe (higher voltage) will give more power, its a bigger flow. the ah is the capacity, thats the length of the pipe. the longer the pipe the longer itll last. if you have two pipes or...
  2. R

    water in battery

    update: i contacted em3ev, and the bms has bluetooth, so i was able to connect to it with an app and see whats doing. it seems the led got fried but the bms is still mostly working, its just out of calibration. theyre going to send me a new bms and led panel. it seems theyre really easy to...
  3. R

    water in battery

    ok, ill try that tomorrow. but if a fuse were blown, would it still be working? i decided to try charging it to see what would happen. charging seemed to progress mostly normally. even though i wouldnt have thought the first green led would be flashing at that voltage, i could...
  4. R

    water in battery

    i finally got around to opening it up, and i dont see anything like that in there, although its hard to see much. the backplate only comes off about a centimeter. theres wires running down under the cells that prevent it from coming off further. it looks like i could pull...
  5. R

    water in battery

    how do i check them? and are they easily replaceable?
  6. R

    water in battery

    yeah, i do, although its a small one. wow, so you dont cover it at all? a bog may be a bit different from salty spray from the road, though, i would think it would be bad for that to get in at all. my big question now is what to do about the battery as it doesnt seem to be working...
  7. R

    water in battery

    thanks. i may open it up fully as it looks like i may have to anyway, it seems the bms is no good or something. one of the lights was stuck on, but faded out. now when i turn it on, the middle green light doesnt light when it tests, and then the red light flashes instead of showing...
  8. R

    water in battery

    i have a 52v jumbo shark battery from em3ev. I noticed just now that my battery was on,even though it shouldnt have been. i tried turning it off, but that didnt work, the lights did funny things and in the process noticed a sloshing sound. i immediately unscrewed part of the bottom...
  9. R

    to buy or not to buy?!

    charge after each ride.
  10. R

    to buy or not to buy?!

    if you might use it some and theres a real chance that the price will go up significantly if you wait, i would just get it now. keep it charged appropriately and itll be fine, no degredation for the few months.
  11. R

    road rage :( (lets hear your stories)

    yup, ever since an incident with a truck i mounted a gopro to my helmet and record all my rides.
  12. R

    Van Moof

    they had an ad on facebook that called them "unstoppable" or something. i replied "why, do they not have brakes...?" theyre ugly imo.
  13. R

    Carbon frame and mid-drive kits 3kW+

    i dont disagree with that, although im not sure exactly how/why it makes a difference. but op's main concern seemed to be comfort, which imo is more flexible on an ebike.
  14. R

    Riding an E bike like a motorcycle?

    i took a corner a little too fast or something yesterday, the rear tire was skipping or bouncing. luckily i didnt go down. i did have a trailer on it, though, thinking about it now, i wonder if i took it a little too sharp and the tire was hitting the arm of the trailer...
  15. R

    Carbon frame and mid-drive kits 3kW+

    it might be a bit less stable than a properly sized bike for me, but im 6'4", and the bike i ended up using is a 19" frame. imo, for converting to an ebike, proper sizing isnt as important as for a bike for regular riding, as youre not really pedaling all that much. (assuming you use the...
  16. R

    brake rotor and wheel rim questions

    good idea. i did change a rim on a regular wheel once, and i used zip ties where the spokes cross to keep them in place. mostly worked, but some of them started to slip down. finding the right size rim seems complicated, though. i dont want to have to unlace the rim before i get a...
  17. R

    brake rotor and wheel rim questions

    from their website: Recommended tire width: 1.75", 1.95", 2.125" (26") Rim Width (Inner): 19mm Rim Diameter (Outer): 572mm (26") Rim Diameter (Inner): 522mm (26") Spoke: 159mm (26") 12G Carbon Steel Copper Nipples so the bigger rotor wont make it more likely to lock and flip? warping...
  18. R

    brake rotor and wheel rim questions

    ok, so ive decided that im not gonna just live with the thump of my wheel that i smashed on a pothole, so the question now is what to replace it with. i could either contact the manufacturer and get an exact replacement, or find another higher quality rim. it would have to be the same...
  19. R

    Motor Replacement

    what makes you think its the motor that needs replacing, and not the battery?
  20. R

    First Build, know what I want, not how to get there.

    what youre looking for sounds very similar to my current setup, which is a 52v battery from em3ev, 1500w rear hub kit from ebikeling. i built on a slightly older (2004) cannondale aluminum full suspension mtb. all told, bike+motor kit+battery+a few other odds and ends cost me about $1900...
  21. R

    hit a pothole, hard.

    how fast is very fast? ive changed the rim on a regular wheel, and trued a couple wheels, so its not completely foreign to me, although i wouldnt say im an expert at it. (i just use my thumb as a gauge, which is what i saw a guy do in a shop once.)
  22. R

    hit a pothole, hard.

    i think its about 60 overall.
  23. R

    hit a pothole, hard.

    yeah, i do that when fixing flats, i was hoping there was an easy way to just lift it up a bit, maybe a milk ccrate under the bb or something.
  24. R

    hit a pothole, hard.

    i think tightening the spokes might have lessened the thump a bit, but its still there. i tried watching the back wheel as it spins slowly, and i do think i see a bit variance as it spins. hard to tell when i have to use one hand to hold the bike up and one to make it spin. i dont have a...
  25. R

    battery mounting outside downtube

    be careful adding holes, if theyre not perfectly round theyll create a stress point that can lead to the frame cracking. the main reason i used the bob was to raisethe battery mount up (technically down) a bit to get part the cable mount/brackets which stuck out a bit past the...
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