The other night we had a bit of a thunder storm and at on point a flash of lightning triggered a brief (less than a second) power hit. I have three separate UPSes (Uninterruptible Power Supplies) in the house — one for each of the two computers in the study and one by the TV, mainly for the TiVo. Well, two of the three completely failed to do their job. There’s actually a fourth UPS, but it’s already been relegated to surge protector status due to previous failures. And there’s probably a fifth (or more) in a closet. I seem to go through these things much faster than I would expect.
I can accept that they have a life expectancy that they could even be meeting it (doubt it), but my real problem is the fact that I receive no advanced warning that they are no longer providing protection. Actually, the fourth one I mentioned did give a warning when it was failing. It began emitting a high-pitched noise under heavy load, and what qualified as heavy kept getting less and less until it wouldn’t even run just the computer without complaining. Neither of the two that just failed are doing any such thing.
Luckily, everything came back up okay.