When you figure it out post those run times.I would like to know the amps at the various speeds so I can figure out how long the 35 AH battery will last. The Arizona Wind & Sun website gives the specs on the Universal 35AH battery i.e. how long it will last at various amp draws. The total voltage drop is always 12 volts. At the fastest speed all the drop is across the motor but as you increase the resistance with the speed coil the voltage left for the motor becomes less and less. Since the circuit is effectively a constant voltage device, as you increase the resistance with the speed coil the current must decrease i. e. E(12 volts) = IR. Thanks.