The trouble with using AC induction motors without a generator, which these folks don't, would be cost of the 240 volt 15000 watt inverter needed to power the motors, not counting any other loads. Inverters over 7000 watts get real pricey. But on the plus side the motors themselves would be pretty cheap.
I think it could be a practical setup, with a single 5hp traction motor, which would only need a 4000 watt inverter. 4000 watt inverters can be found at a reasonable cost. But if money is no object nothing would stop you from buying a 18000 watt inverter (leaving 3000 watt for house loads) and on the plus side your boat would be simple from a codes perspective, with a single 120/240 volt ac segment shared between the house loads and the traction motors, and a 12 or 24volt dc battery pack to drive the dc loads and inverters.
There are a couple of videos (youtube i believe) that show "Harmony's Electric Propulsion"
Harmony's Electric Propulsion System Pt. 1
would anyone have any additional information on this particular system. I can't seem to find anything other than the videos and i am very curious about the motor.
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