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  3. May 2006

Re: Redundant Power

We have seen fractional increase in power draw maybe a few percent at most. On UPS with digital load displays it may go up 1% there depending on the size of the UPS of course. This is because there are additional circuits activated, thus creating heat, and an additional 'air movement device' that is spinning. For planning purposes though if you allow for the rated power of the system you will be well covered even with dual supplies.
If possible use 220v inputs so that the load is balanced across your UPS. If you must use 110v at least make sure that the two powers supplies are plugged into opposite legs of the UPS to keep its load balanced. 

- Larry

ChadB@xxxxxxxxxxxxxxxxxxxx wrote:

This is probably a dumb question, but i'm going to ask it anyway!

When setting up i5 boxes with redundant power supplies, does the 2nd power
supply increase the load on the UPS significantly?  It seems like it might
increase the load by some amount, but i'm curious to know how much...

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