Hello PF, After doing much research, I've decided that buying a retail UPS would be a much better idea than building one from scratch even though the cost is higher. I need to output 2kW for roughly 30 minutes. I am looking for a 3000 VA UPS that meets medical grade requirements. I believe that regulation is UL 60601-1, however there may be more things I may be missing. Any help would be appreciated.