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I have 2 apc 1500va ups's that unfortunately, are modified wave form. They were purchased before I had a understanding of how important the wave form was with different electronics. Rather than post them for resale I thought I would ask here for any ideas on what to do with them. Just looking...

My plan is to homebrew a online double conversion ups for my computers as my electric grid here is spoty, located in eastern usa. A quality sine wave inverter and a battery bank is easy enough, my question comes from what to power the battery bank with as it will be also responsible for...