Putting UPS's in series?
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From: YKhan on 1 Jun 2010 05:56 I'm wondering if there are any dangers or precautions to putting a couple of UPS's in series to increase their power-on time? Yousuf Khan
From: Robert Redelmeier on 1 Jun 2010 07:46 In comp.sys.ibm.pc.hardware.chips YKhan <yjkhan(a)gmail.com> wrote in part: > I'm wondering if there are any dangers or precautions to putting > a couple of UPS's in series to increase their power-on time? Even presuming sufficient VA (=W/PF), few UPSes produce nice sine waves on their outputs while most expect them on their inputs. There may be problems [overheating] with the second UPS. UPS should be able to handle poor powerfactor draws since most computing devices are miserable. It would be vastly preferable to put them in parallel where you can split loads, like one for the CPU, one for monitor & wallwarts. -- Robert
From: YKhan on 1 Jun 2010 10:50 On Jun 1, 5:46 pm, Robert Redelmeier <red...(a)ev1.net.invalid> wrote: > In comp.sys.ibm.pc.hardware.chips YKhan <yjk...(a)gmail.com> wrote in part: > > > I'm wondering if there are any dangers or precautions to putting > > a couple of UPS's in series to increase their power-on time? > > Even presuming sufficient VA (=W/PF), few UPSes produce > nice sine waves on their outputs while most expect them on > their inputs. There may be problems [overheating] with the > second UPS. UPS should be able to handle poor powerfactor > draws since most computing devices are miserable. > > It would be vastly preferable to put them in parallel > where you can split loads, like one for the CPU, > one for monitor & wallwarts. > > -- Robert That's what I was afraid of. I remember hearing something about that sometime back, but I couldn't remember if I heard it right or what the reason was, so I asked here. Yousuf Khan
From: Strobe on 1 Jun 2010 13:37 On Tue, 1 Jun 2010 07:50:50 -0700 (PDT), YKhan <yjkhan(a)gmail.com> wrote: >On Jun 1, 5:46�pm, Robert Redelmeier <red...(a)ev1.net.invalid> wrote: >> In comp.sys.ibm.pc.hardware.chips YKhan <yjk...(a)gmail.com> wrote in part: >> >> > I'm wondering if there are any dangers or precautions to putting >> > a couple of UPS's in series to increase their power-on time? >> >> Even presuming sufficient VA (=W/PF), few UPSes produce >> nice sine waves on their outputs while most expect them on >> their inputs. �There may be problems [overheating] with the >> second UPS. �UPS should be able to handle poor powerfactor >> draws since most computing devices are miserable. >> >> It would be vastly preferable to put them in parallel >> where you can split loads, like one for the CPU, >> one for monitor & wallwarts. If you do this, don't forget to put a small lamp on one of them. Bad enough coping with a power outage without having to do it in the dark. >That's what I was afraid of. I remember hearing something about that >sometime back, but I couldn't remember if I heard it right or what the >reason was, so I asked here. Have you looked into replacing the UPS battery with a larger capacity one? This is the preferred (and more elegant) way to get longer power-up time. -- Terry V.
From: Rick Jones on 1 Jun 2010 14:51
In comp.sys.intel Strobe <Strobe(a)nyc.beep!beep!.com> wrote: > If you do this, don't forget to put a small lamp on one of them. > Bad enough coping with a power outage without having to do it in the dark. That's what all the blinking lights are for - all real computers have blinking lights right?-) rick jones -- oxymoron n, Hummer H2 with California Save Our Coasts and Oceans plates these opinions are mine, all mine; HP might not want them anyway... :) feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH... |