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Decrease charging voltage

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  • Decrease charging voltage

    Hello friends,
    i have a side system for a deep freezer at 30 to 50w.

    My system is 24v with renogy Rover mppt charge controller and 2 x 12v varta lfs 105n dual purpose sealed lead acid battery bank.
    I've chosen the preset charging paremeters.
    I've noticed some white thing at the back small port and I suppose that the charging voltage is high (or gasing charging).
    I'm thinking of decreasing the charging voltage a little bit so as to prolong the battery life.

    Fortunately the manufacturer has no charging paremeters. The only that states is the battery is considered undercharged at 24.6v and charged at 25v or higher.

    The ones I use now are:
    Boost 28.8v
    Float 27.6v
    Boost return voltage 26.4v

    Any suggestions on decreasing or keeping that ones?
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