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split charging diodes

Discussion in 'General Electronics Discussion' started by kpgraci, Jul 10, 2013.

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  1. kpgraci


    Jul 10, 2013
    I want to charge 2 batteries from a single source, a solar panel.

    Not shown in the diagram is a single bank solar regulator, it sits before the diodes.

    I'm aware of the voltage drop problem with this method of splitting, I just wanted to confirm that this is the correct configuration to keep the batteries isolated.

    Last edited: Jul 10, 2013
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    That will work as long as:

    1) you are not concerned that the "flattest" battery is charged first.
    2) You are happy that if one battery loses a cell, the other one won't get charged (restatement of (1))
    3) You're not concerned about overcharging the batteries
    4) The solar panel cannot supply more current that the batteries can safely charge at.
    5) You're happy to either limit charging to a very small period of peak sunlight, or overcharge your batteries.

    An MPPT regulator designed to charge batteries is a better option and will be cheaper than the cost of replacing your batteries.
  3. kpgraci


    Jul 10, 2013
    I agree on all points. I do have a single bank charge controller but as you pointed out the weak battery will dictate what current is delivered. I'm looking into a two bank controller because I just replaced one of the batteries and I did not enjoy the process.
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