A UPS is sized by VA – what is “VA”?
VA is short for “volt amps”. This is a measurement of the power consumed by any given piece of equipment. For larger installations, you will see the term kVA (kilo volt amps). One kVA is equal to 1000 VA. For example, a computer that draws 5 amps from a 120 volt source is using 600 VA of power (120 V x 5 A = 600 VA).