"Well...that question is like asking how much soda should you buy for a party. I don't know how many folks to expect and whether they will come thirsty.
First, electric motors are only measured in HP to compare them to gas engines.
But the HP doesn't give me enough to go by. I need to know the AC motor's recommended voltage. That will tell me the pack voltage for the vehicle and the quantity of cells needed.
Second, size...even more subjective. Things to be considered for an answer to your question are:
How heavy is the EV?
Will it be operating in a hilly neighborhood?
How long is the average commute desired?
What's the max range needed?
Will the AC’s Regen be used? (it could shorten the range.)
I often recommend folks asking that sort of question go to The EV Photo Album and search for similar EVs to the one they want to build. The working range is usually posted. And if not, the page lists the contact email address for the EV builder and most folks love to talk about their experience."
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