How does one calculate what size UPS system one needs?

One needs to calculate the total power consumption of all the devices together that you would like to run from the UPS.
There are basically two ways to calculate the power and energy requirements of a UPS system.

  1. Install an energy logging device, this device will tell you the peak amount of power drawn at once, and the total energy consumed per day and per month. These devices are widely available to buy online, one good example is the Efergy Energy Logger.
  2. Download and complete our “Energy Usage Calculator” This can be completed and emailed back to us. Click here to download our “Energy Usage Calculator.