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Thread: Charge controller 24V to 12V

  1. #1

    Default Charge controller 24V to 12V

    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.

  2. #2
    Join Date
    Mar 2006
    Location
    SF Bay Area (California)
    Posts
    16,890

    Default 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
    20x BP 4175B panels (replacement) + Xantrex GT 3.3 inverter for 3kW Grid Tied system + Honda eu2000i Inverter/Generator for emergency backup.

  3. #3

    Default Re: Charge controller 24V to 12V

    Thanks for the info, that is what I was looking for!

  4. #4
    Join Date
    Jun 2003
    Location
    pittsburgh, pa
    Posts
    9,252

    Default Re: Charge controller 24V to 12V

    keep in mind that you will lose power when using overvoltaged pvs on pwm.
    voltage drop calculator http://www.wind-sun.com/ForumVB/showthread.php?t=29


    NIEL (not employed by naws)

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