Some of the newer HP servers are very picky about power from UPS's, from what I have read. I have used several Best Ferrups UPSs over the years, other than one that toasted it's transformer, have never had any trouble out of them (just replace the battery every 3 to 4 years....). They are picky about their input power, do not run not connect them to an auto regulating transformer (not the proper term?), or on the output of other UPSs, it can cause interesting problems.... Howard On 4/14/2011 15:33, Lamar Owen wrote: > On Thursday, April 14, 2011 02:55:51 PM John R Pierce wrote: >> http://powerquality.eaton.com/Products-services/Backup-Power-UPS/5125.aspx >> or similar for this application. I'd take one of those up versus the >> same size APC SmartUps any day. > > We have a 5KVA Best Ferrups here that has never worked correctly.... :-) But I've seen my share of toasted APC's, too. > > Currently we run older APC SmartUPS (pure sine) for the workstation stuff and Symmetras in the Data Centers. Looking to put in a Toshiba or similar 500KVA in the secondary Data Center later in the year. > >> BTW, another thing the 'good' UPS's do, more important than 'pure >> sinusoidal output' for computer purposes*, is buck/boost voltage regulation. > > Yes. > >> * if you're running audio gear off a UPS, you definitely want the >> sinusoidal output, but thats another market entirely. > > Or old 3Com Corebuilder/CellPlex 7000 gear, which shuts down with anything but pure sinewave..... > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos