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An 18V UPS...am I doomed to 6V batteries?

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    #1

    An 18V UPS...am I doomed to 6V batteries?

    After having a 1500VA UPS batteries die (Best Power Patriot Pro), I was wondering... This thing uses three 6V batteries in series, using 18V as backup (Standby UPS with AVR). 18V? Ugh. Can't use a 12V battery... or can I?

    Anyone know of some tricks to deal with an 18V standby UPS or am I stuck with buying new 6V batteries (three 6V 12Ah SLA's)?
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    #2
    Re: An 18V UPS...am I doomed to 6V batteries?

    Well, depending on how the unit is designed you may be able to modify it to work on 12V. The likely issues will be the transformer windings (the transformer, if it has one, will be wound for 18V to 110/220V step-up, rather than 12V) feedback circuits (if any), and the under-voltage/battery health detection circuits.

    You might get lucky with the transformer if they design it for 12V operation too, it could have spare taps.

    But most likely, it will be a very difficult conversion and it's unlikely to be worth doing.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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      #3
      Re: An 18V UPS...am I doomed to 6V batteries?

      why are 6v battery's such a problem?

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        #4
        Re: An 18V UPS...am I doomed to 6V batteries?

        3 golf car batteries.no problem!

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          #5
          Re: An 18V UPS...am I doomed to 6V batteries?

          So far, the only UPS units I have seen only use 12V batteries (or a pair of 6V batteries) - a unit requiring an odd number of 6V batteries is a bit unusual.
          My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

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            #6
            Re: An 18V UPS...am I doomed to 6V batteries?

            Well, 12 volt batteries are more common. Marine deep cycle batteries can be had fairly readily which would do fairly good as UPS batteries.

            I wonder how cheaply high capacity 6V batteries can be had...
            Last edited by eccerr0r; 04-19-2015, 08:33 AM.

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              #7
              Re: An 18V UPS...am I doomed to 6V batteries?

              check digikey / element14 / newark etc.
              no problem.

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                #8
                Re: An 18V UPS...am I doomed to 6V batteries?

                I might have to just get another set. It might also be the UPS toasting batteries too. I had bought a set of 3 and after one year I had battery problems - it started beeping when the battery self test failed. I'm not sure if I just had a bad batch or the UPS likes eating batteries.

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