Dell 2700w j728n 3kVa UPS not starting

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  • Per Hansson
    Super Moderator
    • Jul 2005
    • 5895
    • Sweden
    #21
    Re: Dell 2700w j728n 3kVa UPS not starting

    Originally posted by nle
    I do have a smart 12V 8A (The batteries are 12V 8.5 Ah) charger that I tried on a couple of the batteries. That is throwing an F1 error message right after it tries to assess the battery.

    F1 error could be: "Clamps are not secured", "Short circuited" or "reverse polarity". But none of those should be the issue.
    "Smart charger" well that is probably the definition of the word oxymoron if you look it up in a dictionary!
    If you have a "stupid" charger then try that, if not it might be worth getting one.
    (You know the old kind with a big chunky transformer inside )

    Edit, something like this:
    https://www.tradera.com/item/343575/...l-veteranbilen
    https://www.tradera.com/item/343575/...-6-12-v-22-amp
    Last edited by Per Hansson; 05-15-2022, 12:47 PM.
    "The one who says it cannot be done should never interrupt the one who is doing it."

      Comment

      • nle
        New Member
        • Aug 2020
        • 9
        • Norway
        #22
        Re: Dell 2700w j728n 3kVa UPS not starting

        Good point. I'll see if I can get my hands on an old school used one for cheap (I'm in Norway, not Sweden btw. )

        If I need to get a new one, do you know if this would do the trick? It's the only "old school" new charger I've found:
        https://www.biltema.no/bil---mc/bilb...8-a-2000030702

          Comment

          • Per Hansson
            Super Moderator
            • Jul 2005
            • 5895
            • Sweden
            #23
            Re: Dell 2700w j728n 3kVa UPS not starting

            That looks like it would be based on an old iron transformer since it weights 2.3KG.
            So I'd say that is a proper charger
            "The one who says it cannot be done should never interrupt the one who is doing it."

              Comment

              • Ateece
                New Member
                • Jun 2022
                • 1
                • Uk
                #24
                Re: Dell 2700w j728n 3kVa UPS not starting

                Did you manage to revive it? I have the same ups in the same state. Batteries are definitely dud but from the manual I believe this should power up even with no batteries. Wondered how u got on.


                Originally posted by nle
                Good point. I'll see if I can get my hands on an old school used one for cheap (I'm in Norway, not Sweden btw. )

                If I need to get a new one, do you know if this would do the trick? It's the only "old school" new charger I've found:
                https://www.biltema.no/bil---mc/bilb...8-a-2000030702

                  Comment

                  • nle
                    New Member
                    • Aug 2020
                    • 9
                    • Norway
                    #25
                    Re: Dell 2700w j728n 3kVa UPS not starting

                    No, not yet. I did get my hands on a non-smart charger, but the batteries are dead. I am pretty sure new batteries will solve it, and I will buy new at some point and report back here.

                    Not sure when though, I don’t really need the UPS, it’s just a nice to have.

                      Comment

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