I have managed over 6-8000 Avalon6's in my time and never had an issue that required a UPS. Maybe the 7 series act different? I have had plenty of SD cards corrupt themselves in that time but that is just normal behavior with old RPi's and a hacked together OS. The fix for that is to just have a spare on hand if you dont want to take 3 minutes to reflash the SD card when that happens. Ill take the $4 fix over the hundreds of dollars a UPS would cost.
For the Avalons, ja. Not so easy with the Bitmain products. Still as I keep saying, for most operations UPS is overkill. In my case the reason for the always on-line UPS's at home was sag. Some summer days the nominal 230v went as low as 180v and of course the generator does not kick in until it goes below 178v. Can't adjust the trip point so got the Cyberpowers. They will supply the miners perfect 240v even with the line below 160v so no-mans-land dead-zone is covered.
Sidenote to that: Got the whole-house generator after the 2-week long blackout that hit Michigan, Ohio, and part of Ontario several years ago. Up until 2 years ago when a huge storm literally blew out the local substation and grid it was needed several times a year. After those repairs, power has been much better, last year worst sag was only down to 208 so very happy with the new grid lines they installed everywhere and outages have been rare
If is a mega-farm then my plan would be to have backup genset(s) yes but manually control changeover.
eg.
Power drops out, let miners go offline and remain powered down(network gear IS of course on a UPS).
Start generator if not automatic.
Contact power company.
If after a few min still no power - change over to generator
Start miners
When stable power returns:
shut down miners
Change over to Utility power
restart miners
Kill genset
Whole point there of course is to minimize how many times all those $&^#! miners of yours need to be restarted.
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