I think a 3 phase converter will give you about 70 % of the motor's hp. It has to do with power factors and efficiency. My dad used to make converters for farmers. He would take a lathe and shave off some of the armature on the motor used to make the 3 phase. He also make static converters using 2 different banks of capacitors. One bank was the starting capacitors and the other were the running capacitors. I forget what the rule was for capacitor size/hp. He would use adjustable timers and motor contactors to connect the start caps for about 1 second and then another motor contactor to pick up the run caps. After you got the motors under load, it was a matter of fine tunning the total capacitor size to minimize the current draw. He would also install bleeder resistors to drain the caps before restarting the motor.
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