actaully no need to replace the motors. I use to have an obsession with building battlebots, and strangely enough, window motors are incredibly powerfull and widely used for bots. I've yet to hear of a window motor that cant be run at 24V instead of 12V. The power goes up drastically.
[the other motors I used were radiator fan motors off ford trucks, at 12V I'd get 0.3hp, but at 24V I'd get over 1.2hp]
You could build a transformer for a few bucks that would convert the voltage to 24V and I guarantee your not going to fry the motors.
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