Cripes!
144v x 500 amps = 72000 ÷ 750 (750ish watts = 1 hp) = 96 horsepower electric!
I have heard that as a rule of thumb, you need 5 times as many horsepower in gasoline as you do electric.
You are building a controller for the equivelant of a 500 HP engine!!!!
Great, now we need to build an Open Source Motor that can handle that!