Just out of curiosity, does anyone have any personal experience with losing utility-provided power more than, say, three times in a day?
Yes. Thats why we have two util feeds to an ATS, then to a generator w/ and ATS and two UPS's. There are two substations in our area, an east and a west. On any feed failure we switch to the other feed. We start the genset if the UPS comes on and run it for 10 min, regardless. Our experience has been that if one feed goes down the other remains but has an occasional blip. We have see the ATS go back & forth a up two *four* times during a 24 hour period. The genset had about an hour of runtime for that day. +------+ +---+ |Genset-----|CTL| +------+ +-|-+ | | East Substation ---- +---+ +-|-+ +-----+ -- DCREC --- DC FRAME |ATS| ------- |ATS| ---- |UPSx2| || West Substation ---- +---+ +---+ +-----+ --- AC ------ AC GRID We a just a little ISP, not a major interconnect point. But, to coin a marketing phrase, "all reliabilty starts with the power."