UPS battery backup question

[GrantB]

Hey also be aware that unless they have changed recently the normal computer UPS's won't run an AC pump very well. I have tested this on large AC pumps which would not turn over at all and also on tiny powerheads which would run but no where near full power. I did buy a true sine wave UPS that worked great (other than very limited capacity) but they are way more money.

I ended up going with an auto transfer switch, True sine wave inverter, charger and sealed AGM battery so there's no venting of hydrogen gas. More money but you can run everything for hours and if one part goes your not replacing the whole thing.