5
I would like to buy UPS, but the review I read:
make me alert of one thing -- the noise of UPS. So, I understand when powering computer (from batteries) UPS fans kick in, making some noise. OK.
But in normal mode, when there is no blackout, and UPS is working in passive mode (not from batteries), does UPS make any noise (I think about its fans)? In other words -- do they work (spin) all the time?
Just in case, I have CyberPower CP900EPFCLCD or APC Smart-UPS 750VA (SMT750I) in mind particularly.
Update
I bought APC Smart-UPS 750VA (SMT750I) and it is noisy all the time -- the noise is similar to grasshopper or older models of HDDs. When I close the windows (so all the street traffic is muted) the noise of the UPS is a bit annoying, but since fans in computer are louder I don't blame UPS for discomfort. Also I find that constant hum of the fan is more disturbing, that the ticking of UPS (as I said, it is similar to grasshopper).
this site does not entertain shopping considerations – Shekhar – 2011-09-16T06:49:43.210
I am not asking for recommendation, but how things work -- from FAQ "Super User is for computer enthusiasts and power users. If you have a question about computer hardware"... And I have -- do UPS fans work in passive mode. – greenoldman – 2011-09-16T06:54:56.897
1Loading a battery generates heat. Whether a UPS in question is able to dissipate the head passively (i.e., without fans) when just doing refresh loads is up to the model in question. (I don't own a UPS myself, but I assume they will use their fans when loading up after a power outage.) Best ask the manufacturer. – DevSolar – 2011-09-16T08:17:10.507