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Alex, no motor is 100% efficient in converting electrical power to shaft power. There are losses: friction, copper, magnetic, etc. When I worked as a power engineer, 1kW/ HP was the rule of thumb for the motor and associated wiring losses. The conversion is correct, it just doesn't account for losses. What field of engineering are you in?That commercial unit specs a current draw of 68 amps at 24 volts, pretty close to what scooterrts calculated. So I think the math is good. Its also interesting that for an idea that shouldn't work there is an off the shelf solution available. That is actually the #1 reason for the success I have enjoyed in my engineering career : "Lots of things that aren't supposed to work do anyway."
Alex
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