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  1. G

    Voltage matching questions

    Ok thanks. But now can you guide me on this question: Do you recommend that I buy a 4 wire Internal resistance meter to check the IR (or RI) for each and every cell? And after I do that, do I need to match parallel groups according to IR measurements? I mean...they are all the exact same...
  2. G

    Voltage matching questions

    I have 140 of the same 18650 cells. There's about five different groups ranging in different voltages: 3.63V, 3.73V, 3.83V, 3.92, and 4.04V. This is my first battery build, will be 72V 20s7p. So far what I read is that I have to match the cells that will be in parallel, to within 0.001 volts of...
  3. G

    How many feet of pure nickel strip is usally used for a 72v battery pack?

    Will 8mm x 0.15 be ok?
  4. G

    This spot welder any good?

    How fragile do you mean?
  5. G

    How many feet of pure nickel strip is usally used for a 72v battery pack?

    I'll be going with the Phaserunner for the controller, so 96A max, the BMS I ordered is adverstised at 100A max continuous, 200A instantaneous. This is for a rear hub, will be used as a commuter on the roads, so 20-30 mph will be the sweet spot, with occasional 30-40 mph bursts. (Also... 8mm? or...
  6. G

    How many feet of pure nickel strip is usally used for a 72v battery pack?

    How many feet of pure nickel strip is usually used for a 72v battery pack? I'm building a 20s7p (140 cells) and probably going with 0.15 x 8mm nickel strip? Will 20 ft sufficieth?
  7. G

    JP spot welder

    I can't find where to purchase the JP spot welder. Someone post a link please.
  8. G

    This spot welder any good?

    https://www.ebay.com/itm/NEW-3KW-AC110V-Handheld-Battery-Pack-Spot-Welder-JD-IIS-Digital-Display-Welding/153381915056?hash=item23b64649b0:g:tQ4AAOSw0bpcZi3e:rk:2:pf:1&frcectupt=true
  9. G

    Help: 72v 20s7p battery design and/or configuration

    Here's the template I'm working with. I'm trying to find the best configuration to divide all 140 cells into 20 in series and 7 in parallel. If anyone likes doing this kind of stuff, chime on in! :thumb: :bolt: :lowbatt: :bolt: :D
  10. G

    looking for a 72v BMS that isn't crap, or maybe do something else?.

    bump for this post, as I am also looking for recommendations for a 72V BMS that isn't crap Are these two from EBAY any good...
  11. G

    1 big battery or 2 small ones?????

    1) 72v 20s6p (120 cells)......OR 2) 2 x 72v 20s4p (2 smaller batteries with 80 cells each) I know it's a matter of personal preference but Is it better to have one big battery? Or to have 2 smaller ones? I'm about to build one (or two). They will be used for a daily commute. :bolt: :bolt...
  12. G

    VOTE: Coil or Air Spring for Front Fork on Road Bike (MTB)

    Thread Hijacking just occured? Thanks a lot. Lol https://www.urbandictionary.com/define.php?term=Thread%20Hijacking
  13. G

    How soft for a replacement coil spring should I get for front fork?

    Setup is 26" Full Suspension MTB, 52v, rear hub motor. Rear Shock is 250 lb/in coil spring w/ dampening. I've ordered a Rockshox coil spring 26" 30 Silver TK. It comes with a "medium" spring which I think will be too firm for me as I am 160 lbs. I ride mostly on the streets at 10 - 30 mph...
  14. G

    VOTE: Coil or Air Spring for Front Fork on Road Bike (MTB)

    I've ordered the coil shock. It comes stock with a medium spring. I'm about 160 lbs. Will be riding on the streets...nice and smooth, but sometimes I encounter bumps, or have to ride on the sidewalk, mostly going 10 - 20 mph. Now I need help choosing a spring because I know the medium spring...
  15. G

    Convince me to upgrade to a sine wave controller.

    In a blink of an eye I am back to eyeballing Grintech's Phaserunner. Can anybody else say even more nice things about it? Personal experiences with it?
  16. G

    Convince me to upgrade to a sine wave controller.

    Wow....Great responses. I was about to unload a shiny penny for the Grintech Phaserunner. Now I'm just going to stick with what I have.
  17. G

    VOTE: Coil or Air Spring for Front Fork on Road Bike (MTB)

    My setup is: 26" MTB Bike w/ 52v rear Hub Motor. I need help choosing a front fork for the road that will be nice and cushiony, not rough and harsh. Narrowed my choices to these two: 1) Rockshox coil spring 26" 30 Silver TK, OR 2) Rockshox Recon 26" with Solo Air Spring Endless Sphere...
  18. G

    Convince me to upgrade to a sine wave controller.

    Very, very good points. Especially the one about being able to have occasional 50A bursts of speed. Can somebody please describe how a sine wave controller feels? Also, how is the acceleration and is the range increased because it's more efficient?
  19. G

    Convince me to upgrade to a sine wave controller.

    My setup: 26" 48v 1500w rear hub motor (52v battery), w/ 35A square wave controller that came with the kit. It runs fine but I have been thinking of upgrading to a sine wave controller for the longest time. I don't know anybody else who has an ebike with a sine wave controller, so there's no...
  20. G

    Best Cushiony Rear Shock for Ebike

    Works great all around for me. Cheap shock suprisingly got the job done over the brand name.
  21. G

    Best Cushiony Rear Shock for Ebike

    YES!!! It's just overall better!!! Now I am going to try to "dial" it in!! The 20 dollar part did the job. But the $200 modern high tech shock just didn't work out! On little and small bumps like the sidewalk it's not as harsh or sensitive. And on bigger bumps, its fun because it's springy...
  22. G

    Best Cushiony Rear Shock for Ebike

    UPDATE: So I bought a cheap $20.00 coil shock off of ebay with the lowest spring rate I could find, which was 350lbs/in. Anybody want to guess how it performed/compared to the Monarch RL?
  23. G

    Best Cushiony Rear Shock for Ebike

    Any other input, tips, hints, insights are welcomed.
  24. G

    Best Cushiony Rear Shock for Ebike

    I think you may be correct on this. I spent 200 bucks on that Monarch RL and expected more since I paid that amount of money on it. I dont plan to spend anymore if it won't yield the results I want....to have better small bump sensitivity. I may try a cheaply coil shock with a very low spring...
  25. G

    Best Cushiony Rear Shock for Ebike

    On my bike, I have a 9C rear hub motor and the battery is on a rack over the rear tire, so all the weight is on the back of my bike. I mostly ride on the road but sometimes I have to ride on the sidewalk. Currently I have a 2 month old Rockshox Monarch RL on the bike with a RST Omega front...
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