https://www.ebay.com/itm/pv590-Powervar-Security-Plus-5000-Medical-UPS-120-208-240v-ABCDEF5200-22-NewBa/132736527223?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160727114228%26meid%3D8f8ce16ff26e4b5abdd03c3725770a89%26pid%3D100290%26rk%3D1%26rkt%3D4%26sd%3D132736527223%26itm%3D132736527223&_trksid=p2060778.c100290.m3507 Another possibility is run a 3 phase inverter unit but only use the output to a small 208 3ph to 120v x former and throw a few 10000 mfd 400 v caps across for good measure, this gives 100% line isolation, voltage correction and phase correction as well as a real clean wave. Ive setup major rock band sound boards with them to stabilize their setup when going all over to different stadiums and countries-yet the feed the sound equipt sees is always the same as it was set up in the studio. again e bad all over the place. avoid the chopped wave cheap chinese ones. also you can set up each phase to run different equipt while being isolated from the house groung line which is usually noisey and offset especially round dry climate and grounding points. Ive seen ac offsets of 40 volts on the ground rod at service entrance where the soil was not conductive enough.
Dont trust home Grounds ever!!
Dont trust home Grounds ever!!