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Ebike help
#11
Make sure you know the maximum discharge rate (Amps) for each cell, and put enough in parallel to meed the demand. I've seen folks put cells in parallel to meet the capacity they want, but the battery gets hot.

I haven't finished my ebike yet so I don't have any credible advice to give as far as capacity. Smile
-Mike G
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#12
(09-18-2019, 04:29 PM)wakila Wrote: I'm goign to buy a conversion kit that has a 48V1000W brushless gearless hub motor. I believe i can make a 4.94 kWh battery (103aH * 48v) with 52 cell (103aH/2000mAh **roughly). Is my thinking wrong on this? is this enough?

Incorrect on the math. It's nominal voltage, not 48V. So if you go with 14s for a "48V" system, the voltage range is approximately 44.8 - 57.4V with a nominal voltage of 51.8V. If each parallel pack/section comes to 103Ah, then 103 * 52 = 5356Wh, or there abouts. At least you calculated lower, better than over calculating and being surprised with crap performance.

1000W / 48 = 21A at full throttle. Surge wattage is probably gonna be closer to 2000W (this is from dead stop and hard acceleration) which means a possible 42A draw from the battery. 52 cells in parallel divided by 42A = 1.23A per cell. This is probably fine for short bursts on reclaimed cells. A bit of a stress on laptop cells, but they probably would handle it. Just don't expect several years worth of life from them. Now, gentle acceleration will be a lot safer/kinder on these cells.
Proceed with caution. Knowledge is Power! Literally! Cool 
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