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Schneider Electric APC Back-UPS 1500VA, 900W.
They power on self-test okay, but go on to just fail to switchover during outages. I'm still trying to figure out if it is a factor of cumulative time, running hours, or they're only good for a fixed number of power failures. And whether its the battery or the UPS device itself.
It feels like crashing your car, and then the airbags go off after you're already mangled and bleeding out.
I have the same model, powering 3 machines with an average load of ~125w when it switches to battery power. I have a NUT host on one of the servers which will broadcast the outage for the other machines and the whole stack shuts down after 30 seconds and switches off the UPS at the very end. Gone through about 4 or 5 true power events now and double that in testing (overzealous I know) but the UPS is 2.5 years old now and is doing just fine. I have a spare battery because I heard ~3 years is normal but so far no indication it’s reaching replacement yet.
I think the important thing for these is to not run them down to 0. They’re only good for one event at a time and shouldn’t constantly be switching over without basically a full day of recharging again (more like 16h to recharge).
I can see consistent brownouts and events being a problem for these little machines. I’m planning on upgrading to a rack solution soon and relegating this one to my desktop in the other room (with a fresh battery of course).