About UPS Sizing

What size UPS do I need?

The UPS you need depends on the load, or amount of A/C, your system is pulling and the equipment the UPS will support. You can determine what you need by following these steps:

  • Determine all the hardware items that will be connected to the UPS.
  • Determine the amp rating for each hardware item and add the ratings together. You can find the amp ratings on the back of the equipment.
  • Multiply that total by 120 Volts (for domestic applications) or 220 Volts (for international applications) to get the Volt Amp (VA) rating .
  • Request a UPS that EXCEEDS your VA total.


  • To select the right UPS for your application visit SizeMyUPS.com
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