I am getting a free 30 HP American rotary Phase converter CNC model. I need one to power my Van Norman 2HP main motor and 1.5HP Feed motor and eventually <5HP Lathe. I have read to double the required HP of your RPC, but what harm is running this 30 HP motor. Just how much power is required to keep the motor turning vs a 10HP motor? I may just try to sell and get something a bit more my size, or even an RPC for the Lathe and Main motor, and a VFD for the mill feed motor.