They will run a freezer a surprisingly long time as long as it isn't opened much.
A sump pump will drain them quickly so for them get 3x as big as you think you need.
Thank you. I see that the CyberPower PFC units I’ve been using have a typical switchover time advertised as 4ms versus 20ms of the Anker. I do like the idea of running a very low energy (but high power) UPS in series with one of these units...
A big PS lightly loaded will hold up longer because it has bigger capacitors however under heavier load that changes.
Under 10ms is considered to be the target for a good UPS.
They dont have a fast enough switch over time to replace a UPS.
However you can plug a USP into one for extended run time if the output is good enough not to trigger the UPS all the time.
I know people who do it with ecoflow units combined with...