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    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?

    #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


      #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


        #4
        Re: Silent APC UPS?

        my smt-750 is totally silent.

        Comment


          #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


            #6
            Re: Silent APC UPS?

            Dose it have vents on the of this UPS supply
            9 PC LCD Monitor
            6 LCD Flat Screen TV
            30 Desk Top Switching Power Supply
            10 Battery Charger Switching Power Supply for Power Tool
            6 18v Lithium Battery Power Boards for Tool Battery Packs
            1 XBox 360 Switching Power Supply and M Board
            25 Servo Drives 220/460 3 Phase
            6 De-soldering Station Switching Power Supply 1 Power Supply
            1 Dell Mother Board
            15 Computer Power Supply
            1 HP Printer Supply & Control Board * lighting finished it *


            These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

            1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
            2 Hem Saw Computer Stack Board

            All of these had CAPs POOF
            All of the mosfet that are taken out by bad caps

            Comment


              #7
              Re: Silent APC UPS?

              Originally posted by sam_sam_sam View Post
              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


                #8
                Re: Silent APC UPS?

                Them cheap plastic cases again
                9 PC LCD Monitor
                6 LCD Flat Screen TV
                30 Desk Top Switching Power Supply
                10 Battery Charger Switching Power Supply for Power Tool
                6 18v Lithium Battery Power Boards for Tool Battery Packs
                1 XBox 360 Switching Power Supply and M Board
                25 Servo Drives 220/460 3 Phase
                6 De-soldering Station Switching Power Supply 1 Power Supply
                1 Dell Mother Board
                15 Computer Power Supply
                1 HP Printer Supply & Control Board * lighting finished it *


                These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                2 Hem Saw Computer Stack Board

                All of these had CAPs POOF
                All of the mosfet that are taken out by bad caps

                Comment

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