List all equipment to be protected by the UPS. (remember to include all monitors, terminals, external hard drives, tape drives, hubs, modems and routers)
List amps and volts for each item.
These figures can be found on a plate on the back of the equipment. Multiply amps by volts to determine Volt Amps (VA). Some devices may list their power requirements in watts (W). To convert watts to VA multiply watts by 1.4.
Multiply the VA by the number of pieces of equipment to get VA subtotals.
Add VA subtotals to get a Total.
Multiply the Total by 1.2 to get the Grand Total.
Use the Grand Total figure to select a UPS. When choosing a UPS be sure that the total VA requirement of supported equipment does not exceed the UPS VA rating.
