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Putting UPS's in series?



 
 
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  #11  
Old June 6th 10, 08:40 PM posted to comp.sys.ibm.pc.hardware.chips,comp.sys.intel,alt.comp.hardware.pc-homebuilt
Sam E
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Posts: 2
Default Putting UPS's in series?

On Tue, 01 Jun 2010 18:45:10 -0400, LSMFT 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.
  #12  
Old June 7th 10, 01:37 AM posted to comp.sys.ibm.pc.hardware.chips,comp.sys.intel,alt.comp.hardware.pc-homebuilt
Bryce
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Posts: 40
Default Putting UPS's in series?

Sam E wrote:

On Tue, 01 Jun 2010 18:45:10 -0400, LSMFT
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.
  #13  
Old June 7th 10, 10:30 PM posted to comp.sys.intel
Rick Jones
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Posts: 36
Default Putting UPS's in series?

William R. Walsh m wrote:
This does not always work, especially if the UPS manufacturer never
intended for larger batteries to be used.


Doesn't that then also imply that the UPS is being used in a context
for which the UPS manufacturer never intended?

rick jones
--
firebug n, the idiot who tosses a lit cigarette out his car window
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...
 




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