Thanks for the feedback. I expected a new controller would be required. Thanks for the links. My main concern was whether or not the motor could handle it. I deal with brushless motor technology in my field of work, but it's limited to 12V (9-16V real world). Typically, the electronics are the limiting factor for increased power applications. FETS are usually the first to show weakness. Anyone know of durability issues with these motors in high voltage applications?

Abneycat - I actually bought my kit from Ken at Power in Motion. I emailed him a few days ago, but no response. I know he's busy, but thought his lack of response might be indicative of not supporting 72V for these motors.