I had an APC die the same way. After spending a bunch of time
troubleshooting it, I got frustrated and bought a Cyberpower that has
worked without issue for three years. I have another 1000VA APC and if it
fails the same way I will probably replace it with a Cyberpower and feel
lucky if I get more than 5 years out of it.
I've now had two APC UPSes in a row fail the same way. Battery is good
> (and a new battery does not solve the problem). Unit passes
> self test every time. But when the power fails, they act exactly like
> what MJB described. Run about 10-15 seconds and quit.