Quote:
UPS’s are given volt-amp (VA) ratings, which is the maximum apparent power the unit can deliver to the load. UPS’s may also have a wattage (W) rating, which is not the same as the VA rating, and refers to the actual power consumption of your connected equipment.
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From bottom of:
http://www.cyberpowersystems.com/electricity.asp
The "VA" rating is not what you need to be so concerned with, but rather the direct wattage rating. VA is more concerned with charge capacity (in a roundabout way), whereas W measure is maximum instantaneous power draw from the battery. Of course, higher VA means longer operation after power loss. VA vs. W ratings are used in this way very commonly for electric devices.
Cyber Power's site lists all the information for their UPSes, unlike that store site AZ linked to.