UPS

Hi,
I am planing to buy a  UPS for our servers. we have two servers and external HP backup drive. One server is compaq and another one is assembled P4/2.8. how can I calculate the power consumption of both server and backup drive?
pleas help.

rva
raja0123Asked:
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nobusCommented:
You can calculate the power needed for every system, or look at the figures printed on the power supply (needs opening the box), then add them

calculate the needed power :

http://www.jscustompcs.com/power_supply/      
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grbladesCommented:
Hi raja0123,
For these two servers planning for about 400-500VA. However you will find that practically whatever UPS you buy the rating will be sufficient but the battery runtimes will vary significantly. Don't forget about the monitor either.
As a minimum I would suggest a 1000VA UPS which should give you a runtime in the order of at least 30 minutes.
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nobusCommented:
And do not forget there are 2 different kinds of UPS'es :
1- runs off the AC, and switches to battery if the power falls out
2- runs off the battery always (best, more expensive)
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rmcferrenCommented:
I have a better Idea depending on how critical these servers are.  Run them off of the UPS as said, I agree with the 1000VA, then have a standby generator, the UPS will provide the power until the generator comes on.  Not cheap, but if the server is critical, it is worth it.
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grbladesCommented:
You might also wish to consider doing what I do.

I have a rack of compaq servers which all have redundant power supplies. I have a couple of UPS's with compaq power supply going to a different UPS. This means I have added fault tolerance and when the batteries need changing every 3 years or so I can shut down one UPS at a time without having to switch off the servers.
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bstrauss3Commented:
APC - http://www.apc.com - has a UPS configurator (obviously it recommends APC solutions), which has knowledge about the actual power consumption of a lot of modern computer equipment.

-----Burton
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grbladesCommented:
I think everyone who answered made a good contribution but as you can only split it 2 ways maximum I will leave it to you.
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