RE: [Slightly OT] Parallel UPS?

["Keith Doxey" <lists.diyha@xxxxxxx>]

Just to confirm what Kevin said NO !!!!

 

The two outputs would not be syncronised to each other and would short out. Even if the same oscillator was running both UPS's there would be slight component differences that would cause thew output voltages to be slightly different. This would mean one unit would do all the work.

 

To increase the running time, look at connecting additional or bigger batteries to the UPS.

 

Keith

www.diyha.co.uk
www.kat5.tv

-----Original Message-----
From: Kevin Hawkins [mailto:lists@xxxxxxx]
Sent: 30 April 2002 00:11
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] [Slightly OT] Parallel UPS?

NO - you should definitely not do this - what you can do is split any connected equipment between the two power units egg monitor/printer to one unit and CPU on another. In terms of best outage time you should put the CPU (only) on the highest rated unit.

 

Kevin

-----Original Message-----
From: Scott Ling [mailto:s_ling@xxxxxxx]
Sent: 29 April 2002 23:08
To: ukha_d@xxxxxxxSubject: [ukha_d] [Slightly OT] Parallel UPS?

Just 'acquired' another UPS on ebay and was wondering if it's possible/safe to connect the outputs of two similar rated units to provide a longer running time, assuming total load is not more than the max for either ?

Scott.



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