David Magda wrote:
On Jun 30, 2009, at 14:08, Bob Friesenhahn wrote:
I have seen UPSs help quite a lot for short glitches lasting seconds,
or a minute. Otherwise the outage is usually longer than the UPSs
can stay up since the problem required human attention.
A standby generator is needed for any long outages.
Can't remember where I read the claim, but supposedly if power isn't
restored within about ten minutes, then it will probably be out for a
few hours. If this 'statistic' is true, it would mean that your UPS
should last (say) fifteen minutes, and after that you really need a
generator.
Or run your systems of DC and get as much backup as you have room (and
budget!) for batteries. I once visited a central exchange with 48 hours
of battery capacity...
--
Ian.
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