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If he only wants a top speed of 20mph, then he should get phenomenal range out of a small pack. The cheaper the better if he's planning on making it economically viable. For 60 to 80 miles of range 10-12kwh or less should suffice. If you look at commercial options for electric rickshaws, they run at 60 volts using a bank of lead acid batteries, and only a couple horsepower motor.
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I try to be helpful. I'm not an expert.
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