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I don't think I've never seen someone install a ~100hp DC motor in a car, it would be gigantic! Most guys go with 1/3 to 1/4 the hp rating. Any golf cart type motor would work quite well for that size of vehicle and those low speeds.
As for batteries that is a good question. I have no idea what kind of Wh/km youll get, but I'd probably have to guess and say 200 wh/mile (conservative I think, but others feel free to correct me this will alter calculations drastically), which would be 125 wh/km. If you want that kind of range, you're still going to need a decent size pack around 23 kWh of lithium cells and much more if you're thinking about going with lead acid. I'm thinking a 48-72V pack. At 72V you'd need 300Ah worth of battery (I'd recommend lithium). At 48V you would need 450Ah. That is all calculated based on 125km (~80 miles) of range.
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