On 11/02/18 17:31, Graeme Gemmill wrote:
That was a bit of a rant; in fact, I couldn't be bothered to read it all.
I bought a APC back-up 800 UPS many years ago after 6 power outages in
one day It's sufficient to supply 2 PCs and their monitors, a Buffalo
network backup device and the hub that connects them (operation time 17
mins) . I have replaced the battery once. I use the excellent apcupsd
software. Not a great expense in the wider scheme of things, and I'm
very pleased I have it. According to the log, most outages are very
short - a few seconds - and there have been 56 since 29 October 2017.
Yes those were my thoughts too. I have 3 APC SmartUPS ranging in age
from 12 to 21 years. With apcupsd they just get on and do their stuff.
Sealed lead acid batteries last approx 4 years in these sort of
applications; I've brought various replacements off ebay (the UPS 700
batteries have somewhat rare 1/4" terminals on 12Ah cells which is
something to watch).
I noticed probably 15 years ago that apcupsd started reporting these
very brief outages and did look into switching that off (as I generally
didn't see so much as a flicker to indicate they were of any
significance) but just learned to live with it.
I don't think a UPS is a good community-driven project. The voltages,
currents, and consequences of getting something wrong (and there's loads
that can go wrong), are way too nasty. Then there's custom magnetics,
EMC - the list goes on and on.
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