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    • Charge controller 24V to 12V

    Registered Users Posts: 4
    in Solar Beginners Corner #1
    Good day,

    I'm looking for a charge controller that can convert 24V to 12V but not an MPPT. I know that the charge controller will have only about 50% efficiency but its ok.
    If someone can provide me a brand name or model.

    Best regards.
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    • Super Moderators, Administrators Posts: 33,681 admin
      #2
      Re: Charge controller 24V to 12V

      You should be able to use any 12/24 volt PWM charge controller. It will have the input voltage rating to work with "24 volt" panels (really Vmp~35 volts) and will regulate to 12 volts (if programmed correctly) for your battery bank.

      There is really no "voltage conversion" going on... The battery bank simply "clamps" the array voltage to ~14.5 volts or so while charging. Then the charge controller turns off and the array voltage goes back to Voc-array.

      The Xantex C40 is rated to 125 VDC maximum input voltage (and 12/24/48 volt battery banks).

      -Bill
      Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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    • Registered Users Posts: 4
      #3
      Re: Charge controller 24V to 12V

      Thanks for the info, that is what I was looking for!
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    • Solar Expert Posts: 10,300 ✭✭✭✭
      #4
      Re: Charge controller 24V to 12V

      keep in mind that you will lose power when using overvoltaged pvs on pwm.
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