Silent APC UPS?

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  • cook
    Quiet observer
    • May 2010
    • 100
    • USA
    #1

    Silent APC UPS?

    My old BackUPS LS 500 is silent. When it is not running on battery, there is no hum or slight buzz at all -- nothing. I like that.

    I just got a BackUPS CS 350, hoping it would be silent too, but it has a slight hum/buzz to it. When the room is very quite, you can hear it from 10 feet away.

    Does anyone know of a good brand of UPS that is silent, and around 300-500VA?
    Tags: None
    • cook
      Quiet observer
      • May 2010
      • 100
      • USA
      #2
      Re: Silent APC UPS?

      Just a quick update... My LS 500 actually does make the faintest hum, but you can only hear it when you ear is right up next to it.

        Comment

        • eccerr0r
          Solder Sloth
          • Nov 2012
          • 8694
          • USA
          #3
          Re: Silent APC UPS?

          and I thought I was being over sensitive when I can't stand Delta fans...

          /me goes back to listening to the computer fan cacophony. Sans Delta fans however.

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8070
              • Canada
              #4
              Re: Silent APC UPS?

              my smt-750 is totally silent.

                Comment

                • cook
                  Quiet observer
                  • May 2010
                  • 100
                  • USA
                  #5
                  Re: Silent APC UPS?

                  Thanks for the feedback on the 750.

                  I have found out that my cs-350 is much quieter when sitting on carpet vs. tile. And that makes a lot of sense because carpet absorbs a ton of sound, yet it still surprised me how much difference it made. I can live with it now.

                    Comment

                    • sam_sam_sam
                      Badcaps Legend
                      • Jul 2011
                      • 6031
                      • USA
                      #6
                      Re: Silent APC UPS?

                      Dose it have vents on the of this UPS supply

                        Comment

                        • cook
                          Quiet observer
                          • May 2010
                          • 100
                          • USA
                          #7
                          Re: Silent APC UPS?

                          Originally posted by sam_sam_sam
                          Dose it have vents on the of this UPS supply
                          Yes, it has vents. But the carpet is not blocking them.

                          I think the sound mostly comes out of the top vents. Also, when I squeeze the side of the UPS (which is plastic), the sound changes a bit, and is a bit quieter.

                            Comment

                            • sam_sam_sam
                              Badcaps Legend
                              • Jul 2011
                              • 6031
                              • USA
                              #8
                              Re: Silent APC UPS?

                              Them cheap plastic cases again

                                Comment

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