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NEED HELP! Building 4x 13S14P 18650 battery pack for electric bike

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NEED HELP! Building 4x 13S14P 18650 battery pack for electric bike

Old 10-05-17, 11:56 AM
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jasonhall
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NEED HELP! Building 4x 13S14P 18650 battery pack for electric bike

I'm trying to build a 96V 95AH battery pack for my 3000w hub motor setup (too big of a pack i knowww) and so i was thinking of doing 4 packs of 13s14p (2 in parallel, 2 in series) to charge 2 packs in parallel at a time with my 2 20A 48V chargers. I'm using samsung 18650INR 35E batteries which are 3500mah and have 8-10a discharge. So my questions are..

1) Is this how you connect two separate packs in parallel? after welding and connecting bms wires etc.. you connect the negative of pack 1 to the negative of pack 2 and positive of pack 1 to positive of pack 2.

2) Is the battery choice the best? i wanted high range but is it safe (not the highest discharge rage) to use with a 3000w hub motor?

3) What connectors do i have to use to connect the battery pack to the controller?

4) whats the kWh/km for 3000w motors rated at 96V? any ideas?

Thanks!
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Old 10-06-17, 01:18 PM
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chas58
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well, you don't want to connect two batteries, as the one with more charge will dump its excess charge into the other batteries and destroy something.
2) generally people stay below 52v because of safety issues.
3) I use XT90-S connectors (to avoid spark problems)
4) depends how fast you go. Go to ebike.ca and play with their simulator to see how speed battery controller impact your range...
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Old 10-06-17, 02:56 PM
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2) a. The higher the voltage the less range for a given battery size. If you run at 48v you could double your range for the same size battery. A smaller geared motor would be more efficient as well.
b. At 96v a 30amp controller will be putting out 2880 watts. So you will be getting close to the limit of a 3k motor. If your controller is bigger than that you could be spiking some serious heat into the motor.

96v is a lot of energy to be building and not know how to connect the wires. Would make a big spark if you did something wrong. If you ask at es they would be all over your questions. the 'bigger is better' forum. good luck
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