Originally posted by: Slaughter
I'd be happy with something that would give me a minute under heavy load to get through flickers and a couple second brown out. Its the power flickering and the computers restarting 2-3 times in a few seconds that worries me.
I'm pretty sure you'd do this anyway, but please wait for more advice before clicking "Add to cart," because some people here have lots of experience with this kind of stuff, and their advice would be helpful.
To make a better selection, we need to know what kind of equipment you're wanting to power. There's no way you'll be able to power a herd of 5 or 6 systems off of one of those cheap UPSes; just because a single UPS has enough battery capacity to keep your 6 crunchers (or however many you have) up for 1 minute, doesn't mean that it will be able to output enough power at any particular time for all of those machines (UPSes typically have a limit to the number of watts that they can sustain, and it's probably not enough for tons of computers, even if the battery capacity would support them).
Edit: BTW, what kind of budget do you have for this project? To some people, cheap equals less than US$10 (like most of us), or as much as US$1,000,000 (if you happen to be Bill Gates).