Putting UPS's in series?
in [Chips]
|
Prev: !!!!!!!!!!!!!!!!!!!! SOFTWARE 4 SALE !!!!!!!!!!!!!!!!!!!! � 9550
Next: Intel Unveils Supercomputing Multicore Processor called Knights Corner
From: Bill Davidsen on 1 Jun 2010 15:38 YKhan wrote: > 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? > In general it's more effective to split load or use a bigger UPS. With few exceptions the output of a UPS is ugly with high frequency harmonics, resulting on a bunch of losses.
From: Steve Thompson on 1 Jun 2010 15:43 On Tue, 1 Jun 2010, Rick Jones wrote: > 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?-) Absolutely. Anyway, we have a nice illuminated EXIT sign which is on emergency power and so stays on when the power is out. The computers are not, because the emergency power is turned off once every month for "testing". Really. Steve
From: LSMFT on 1 Jun 2010 18:45 YKhan wrote: > 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 Series would double the voltage and blow your stuff up. -- LSMFT I haven't spoken to my wife in 18 months. I don't like to interrupt her.
From: Sam E on 6 Jun 2010 15:40 On Tue, 01 Jun 2010 18:45:10 -0400, LSMFT <boleyn7(a)aol.com> wrote: >YKhan wrote: >> 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 > >Series would double the voltage and blow your stuff up. That's funny. I hadn't thought of connecting the OUTPUTS in series.
From: Bryce on 6 Jun 2010 20:37
Sam E wrote: > On Tue, 01 Jun 2010 18:45:10 -0400, LSMFT > <boleyn7(a)aol.com> wrote: > >>YKhan wrote: >>> 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 >> >>Series would double the voltage and blow your stuff up. > > That's funny. I hadn't thought of connecting the OUTPUTS > in series. In 'normal' mode, most consumer-grade UPS devices just pass through the input mains power. Any attempt at connecting the outputs in series would either result in total output voltage equaling mains voltage, or zero and an immedite shutdown by either unit's short-circuit protector. When operating off-line (i.e., during a line power failure) it would be possible to obtain much more than rated voltage with the series connection, but it would be weird. The two UPS units would not be phase synchronized and probably would not even operate at exactly the same frequency. Output voltage would vary unpredictably. |