400A at 36 to 84V sounds like a lot more than 5.5HP. What is the approximate weight of the motor? I assume it is a brushed motor, from the Curtis controller. Maybe 400A is peak current, not sustained current?
If the motor weighs less than about 30lb it would be a shame to use such a heavy outboard carcass. Most 5kw to 10kw motors work just fine on about a 20HP unit. One advantage to the big outboard though, is the original prop would probably work a bit better than the stock prop of a 20HP unit. Your motor will spin a lot slower than the original gasoline engine at max revs. Anyway, the conversion ought to be fun and keep you busy for a while. Certainly, it should work. You will probably want to try a few different props and see which one suits you best at your typical cruising speed.
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