[rescue] Power Requirement Calculations

[Clemson, Chris]

Hi everyone,
Does anyone know of a website or some software which lists equipment and
power requirements?
I'm trying to size a computer room for current kit, and it would be nice
to be able to get a list of makes and models of kit.
I once did this for networking stuff to spec a UPS just by taking the
Max Watts listed in the manuals.
In the end, this was double what was actually needed!
At least we could use the spare UPS somewhere else tho.
It's a bit different when you've got to spec something immovable (and
costly)!

I don't really want to have to go round plugging in one of these:
http://www.maplin.co.uk/Module.aspx?ModuleNo=38343&TabID=1&source=1&doy=
11m12 into each device, one at a time.

Any ideas?
Thanks,

Chris