I tried my four post 3 phase lift throught a phase converter when i first put it in my workshop, it would work with nothing on the ramp but put a mini on it and there was no chance it was going to lift !, the converters loose to much power in the convertion i think, i now have a single phase motor on and it has work very well for 9 years. dont be fooled by machine mats claims there motors will not have the balls for a car lift imho !
Paul