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  1. #11
    User
    Join Date
    Oct 2012
    Location
    Durban
    Age
    45
    Posts
    2,123

    Default Re: Charging my alarm backup battery using solar

    Quote Originally Posted by Vaal View Post
    I don't fully agree with you. The way I was taught: If in parallel the most fully charged battery will have the lowest internal resistance and thereby it will always be charged more than the flatter battery. It would have been perfect it it worked other way around but pity a lead acid battery doesn't work that way..
    You are not taking into account that the battery with the greater charge also has a higher voltage which acts to "resist" the charger more than the battery with the lower charge.

    That being said excluding the charger as soon as you connect the two batteries in parallel the one with the higher voltage (and hence charge) will force current into the other pretty much charging it until both battery's are at the same voltage. At this point they act as one battery with double capacity. Obviously though it will take double the energy to charge them too.



    Sent from my SM-N975F using Tapatalk

  2. #12
    User
    Join Date
    May 2018
    Age
    44
    Posts
    43

    Default Re: Charging my alarm backup battery using solar

    I connected a 110ah deep cycle battery directly to the alarm box. It gets charged by the original alarm power pack. It has been working like that for 2 years now. No problems even after two sessions of stage four shedding in one day.

    Sent from my SM-G973F using Tapatalk

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