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Oh, i understand that VA is constant (minus transformer losses). I'm just thinking that AC motors are said to be more efficient, and better suited to doing more than just launching (low end torque of a dc motor)... But if i want to run a 120VAC motor on a bicycle, i don't want to carry 10 car batteries with me. So i was curius if i could use, say, 2 batteries to generate a control signal from a lower cost, lower voltage controller, then step it up and run a motor. Say i wanted to use a vacuum cleaner motor - 120V@10A = 1200VA. So 1200VA/24V = 50A. It would be easy for 2 car batteries to run at 50 amps, no?
As for stepping it up with a DC/DC converter FIRST - that sounds more lossy to me because that DC/DC is probably generating an AC sine wave, then stepping it up, then rectifying it, then i feed it to my controller, then generate an AC wave again. In my case, i'd just be taking the battery DC, converting it to sine, then stepping it up.
Anyway... just thinking outside the box. No real merrit to this.
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