[coolhandcountry]

If you ran the truck with same gearing as you did with the 14.4 volts to get the 580 watts. Which comes out to a 40 amp draw. My calculations say that if you go up to a 16.5 volts the amp draw will in creas as well to about a 47 amp draw. That would put it at about 775 watts. If the motor is only a 60 % efficent. You had to have about 1300 watts going in. at 16.5 volts You are at an almost 78 amp draw.