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Hi every one ... I have a UPS with 12V 7A battery .. i want to replace the battey with 12V 100AH battery with an external charger. The problem is i don't know how to cut out the built-in UPS charger?

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  • Ricky Haycraft
    Ricky Haycraft May 04, 2015

    Very BAD idea. 1. You don't need an external charger,perhaps an external monitoring device but defeating the internal charger assy will cause a fault in your system.

  • Ricky Haycraft
    Ricky Haycraft May 04, 2015

    PERMANENTLY until it is no longer disabled

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Two issues must be noted in this case.
First of all working the UPS continuously on the battery for more than the stipulated time of the design could generate problems especially if the heat sinks for the MOSFETS are insufficient. Secondly the charging circuit is designed along with the drain circuit and so you need to get the battery charged externally in parallel with a proper cut off circuit.
My suggestion to you is that Instead of this modification, it is better to get an UPS/Inverter of 500 VA which will easily work on the 1000AH battery, new designs are compact and efficient. You keep aside this short period UPS for a specific purpose or even connect this to the main UPS/Inverter.

Posted on May 04, 2015

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