12V Low Voltage Disconnect (LVD) capable of switching 300W inverter?

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  • inetdog
    Super Moderator
    • May 2012
    • 9909

    #16
    The way I understand it, there is a hard and fast LCV which will protect the battery from long slow drain (radio or dome light on) and still allow for surge loads while the battery is at a decent SOC.
    The timed combination allows you to set a higher threshold which only applies when the drain that is causing the temporary lower voltage (based in the internal resistance of the battery) is happening for a limited time only. Trivial example is cigarette lighter that might take 10A for only a minute.
    More serious example would be a winch that draws high amperage but only for a few minutes at a time, dropping the measured voltage but not immediately changing the battery SOC by much.
    If the voltage hits the hard limit, the time window will be ignored.
    SunnyBoy 3000 US, 18 BP Solar 175B panels.

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    • PNjunction
      Solar Fanatic
      • Jul 2012
      • 2179

      #17
      That's exactly how it works. The user switchable (ITS-12) options are timed voltage start, and a choice of either of two hard lvd's.

      In my situation with lifepo4, I set the timed voltage lvd dropout rather high (default 0 or 1 setting) when I'm using an inverter or such where I'm not exceeding about 0.1 - 0.2C discharge. The timer works perfectly.

      Again a warning that this is for those who know what they are doing with lifepo4, and not necessarily for the guy next door. For that, stick to lead-acid, which these lvd's were designed for.

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