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In general, fuses are there to keep wires from melting.
Cabling is rated for various amperage, above which, it gets hot.
I took a 3-credit college course on energy a while back, and the teacher had all sorts of great stories. He pointed out how many amps you could put through 14ga copper wire IF it were completely UNINSULATED and strung up outside on a cold day - it was a lot.
On top of that, yeah, motors and engines are designed for a certain range of power, so the cabling, motor, and engine are all roughly matched.
My main thought is that you need a generator that can put out in direct current the same as the AVERAGE energy use of your electric motor while cruising. I had some issues with my battery charger, and some battery chargers are particularly picky about the AC they get. I always thought a bridge rectifier and a battery pack of close to the same voltage would be a simple way to go about it.
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