First why?
next the only good way is with batteries to supply peak power.
Single ph AC alts will burn up charging batteries or running a DC motor. You need a DC generator.
What vehicle? Nothing can be done until we know that.
I'm presently working on an aero cabin MC that can be built very inexpensive that would do your job. Also a 3wh enclosed EV trike both body, chassis made from wood/epoxy. The secret of long range cheaply is lightweight, low drag. It only needs 6 12v batteries
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