395 at the wall? If that is so, assuming a psu efficiency of 90% it draws 356W @12V from the psu. Since the psu is rated for 1200W@12V 3*356W should be fine on 110V, no?!
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i wouldn't do it, not worth frying your hardware let alone start a fire in your home. go get another psu either atx or server or another apw3++.