The 24 volt alts. usally come off small diesel engines or backhoes. I had a 12 volt alt and a couple car batteries here somewhere,but i need a 12v motor for my tests. I was going to bench test the idea by the running time of the motor on a battery alone versus the running time with alt. backup. Spin the alt. at about 1500rpm with a washing machine motor to simulate being driven by the wheel.But then that is constant and riding is varied speed. Im starting a gas weedeater/mt.bike build so i don't want to go in an opposite direction on my only bike, though I am going to give this idea a shot once I get the funding for parts and another bike. I will keep you posted on what happens...be it works or bombs.