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how much power does my server use?

I am looking into rack mount UPSes.  I have 8 servers to take into account, each a Dell.  There are so many to choose from and financially speaking, it seems best to buy a few 2U rackmount UPSes that will each service 2 servers.  The ones that look good are 2200VA and above.  However, I'm still not sure if that is good enough for my needs.  Our computers don't have any more than 550W internal power supplies, so I'm guessing the server will probably need slightly more.  

Does anyone have suggestions on how to go about buying the right UPS?  I only need help on getting the right VA/W capacity for the UPS, not the other features.
1 Solution
You need to decide how long you want your servers to run in case of a power outage.

that will help determine size.
sedberg1Author Commented:
Run time is not the most important thing.  The server shutting down gracefully is the most important thing.  We don't have backup power for the client workstations, so even if the server ran for an hour, no one would use it since the clients would've lost power.
Joseph DalyCommented:
If you go onto the APC website they have a system configurator that you can run through which will reccomend their models etc you should use to meet your specs.

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Yes, it depends how long you want your server to run. And one more thing, your power supply capacity does'nt matter. What matter is the total wattage each server draw. You can you some online software to calculate appoximately , this one is an example http://bugclub.org/beginners/miscellaneous/upscalc.html 
if graceful shutdown is what you want, 15 minutes of battery backup is good enough.

your servers should be having at least a 600 watt PSU.

the 1000VA models should be appropriate for 2 servers (600*2 watts) for a 15 minutes runtime.
sedberg1Author Commented:
All I needed was the VA settings.  This UPS selector had each of my server models and told me what VA to use for my configurations.

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