There are multiple factors to consider when you want to purchase a small UPS to protect office equipment loads. Make sure you've answered the following questions before you write the check:

  • What rating do you need? Make sure you get enough capacity to handle the volt-ampere requirement of your load and allow a margin for the harmonic characteristics of the load.

  • Can you tell how the unit is operating? Look for indicators associated with battery charge, surge suppressor protection, and operating status.

  • Is there software for interfacing with your computer or server?

  • Is there voltage regulation to prevent unnecessary switching to battery for minor voltage variations?

  • Is the system sensitive to input voltage distortion or capacitor-switching transients? Is there an adjustment to change this sensitivity?

  • Do you need a sine wave output? Probably not, unless your protected loads include motors — or the unit is an online type.