As far as I can see a motor above 100hp is going to need something more than 230V:
100hp/75kW output means that input must be at least 80kW (assuming pf to be 1 and efficiency 94%) 80kW @ 230V = 350A
A 150hp motor will require more than 500A. I noticed that the larger motors are rated for 460V, but that must be a rather unusual single phase voltage in the United States, right?
