We tested the controller with the power section! You can hear the faint 4 kHz tone on the video. It's actually really quiet in real life. It is almost completely masked by the sound of the wheel spinning. It worked on the first try! I was scared! I'm so happy! I don't think it will be that terribly difficult to replace the 100v mosfets with 200v mosfets, and to use 10 of them instead of 5, and to use bigger bus bars. The 200v version can put out 50 amps per mosfet, so 10 would make a 500amp controller. The software is already done for the car's version. The main problem is the 200v mosfets are like $15 each, so it will be a while before I get a bunch of them.