Yeah, I assumed UPSs were silent (other than when the power goes out, at which point they're presumably beeping to get your attention, plus maybe a fan spins up to cool the batteries?). But some reviews seem to suggest UPSs can produce noise during regular operation?Well, I didn't really check. I have two 950w in the bottom of my server rack so I figured that would be plenty. One is solely for a mac pro server and the other runs drive bays, hub, modem and I think I plugged the PJ into the one that just powered the drives and stuff. I think my Benq 1070 is 240 watts. My ups specs say 17.5 mins with 475 watt load. And I'm sure I'm under that with everything hooked up. I've got a small UPS for AVR it's 300 watt runs for 1min, it just has one battery. My little UPS 300 watt, that would be really close. I'd want something in the 5 min. range at least.
Mine don't make any noise until the batteries need replaced and then it's quite irritating when the alarm is going off. Sounds like an angry cricket back there. The fan from my 24 port hub is the only thing I hear.
I'm going to have my equipment rack in the room, but I do have the option of putting my UPS in a neighboring closet.