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Cyberpower CP900EPFCLCD UPS not charging

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    #1

    Cyberpower CP900EPFCLCD UPS not charging

    Hello,
    I have a problem with a Cyberpower CP900EPFCLCD UPS unit that seems not charging the battery.

    With AC power connected I measure 13,50V on battery terminals.
    If I unplug AC cord, voltage drops below 10V after no more than 30 seconds causing UPS to shut off.
    I'm testing with a load of 20W.

    Plugging AC power again UPS turns on and battery charge level indicates 100% (even if I disconnect battery!!!!).

    Tried with new battery same behaviour.

    Therre is no sign of blown components. Could you help me troubleshooting this issue?

    thanks in advance
    Attached Files
    Last edited by SMDFlea; 05-20-2023, 10:12 AM. Reason: Added "Cyberpower CP900EPFCLCD" to thread title
    Tags: None
    #2
    Re: Cyberpower CP900EPFCLCD UPS not charging

    13.5 should charge the battery .. 10v is low . test the battery . or leave to charge overnight and then test . even new batteries can be bad .

    Comment

      #3
      Re: Cyberpower CP900EPFCLCD UPS not charging

      I really do not understand, I tried with another battery pulled out from another ups.

      If I power on UPS whithout battery, it shows 100% charge level (?!?).
      With AC power: 13,6V on battery and current flow of 0.5-1A.
      On battery: voltage holds above 12V for 30 seconds then drops quickly below 10V and UPS shut off.

      I've just ordered another battery to test tomorrow.

      Comment

        #4
        Re: Cyberpower CP900EPFCLCD UPS not charging

        does it get full voltage and good sinewave at the outlet ?

        Comment

          #5
          Re: Cyberpower CP900EPFCLCD UPS not charging

          voltage is correct, sinewave I'm not able to check but I tried to power an active pfc psu so I presume is good.

          Comment

            #6
            Re: Cyberpower CP900EPFCLCD UPS not charging

            To me this would indicate that you have a bad battery or you have a severe over current condition on the primary side which is the battery side and the secondary would be the 120 volt ac side when you are on battery
            power
            Last edited by sam_sam_sam; 05-22-2023, 06:34 PM.
            9 PC LCD Monitor
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            All of these had CAPs POOF
            All of the mosfet that are taken out by bad caps

            Comment

              #7
              Re: Cyberpower CP900EPFCLCD UPS not charging

              just an update. It was a bad (new) battery.

              Comment

                #8
                Re: Cyberpower CP900EPFCLCD UPS not charging

                well done ..i like the easy ones

                Comment

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