the only real way to destroy a motor is to make it overheat. Right? I would think that a 48v 1200 watt controller would be just fine to use on most every hub motor. And yes, a 1200 watt controller would probably have more torque in most cases unless we are talking about comparing a geared hub motor to a non-geared and then it might be close to equal. Since you are just swapping out the controllers, then yeah, the 1200 watt will give you more torque on the same hub motor.
I think watts = voltage x amps . So that 1200 watt controller will be pulling more amps out of the battery. I hope you have a battery that can handle it. Make sure you do. So 48v x 25 amps = 1200 watts. So the controller is probably a 25 amp controller where as your previous one was only 48v x 10 amps = 500 watts. Only about 10 amps. So make sure your battery can handle a 25 amp peak draw.
One more thing you need to make sure is the type of controller is okay for the motor. They have something called 120 degree types and that's probably what yours is since most motors and controllers are the same. It has to do with the hall sensors. If you are just upgrading the controller with the same brand name then it's probably fine. You need match a brushless hub motor with a brushless controller with the same kind of hall sensor circuitry. It's probably okay but it's good to make sure that it will work beforehand.
Last edited by morph999; 06-25-10 at 12:17 PM.