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Charge controller maximum PV input power

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  • Charge controller maximum PV input power

    I placed an order for a 30A MPPT Charge Controller. The brand is MakeSkyBlue. I opted for it because of good reviews.

    I later found this in the datasheet...

    The maximum PV input power
    (The total power rated of PV can’t be over this watt that will break the controller.)

    12V system (400W)
    24V system (720W)
    36V system (1000W)
    48V system (1200W)

    I have a 24V setup. Does that mean I cannot have more than 720W of solar panels as input into this charge controller?

    BTW, the controller will be used to charge a 24V 80Ah LiFePO4 battery bank.

    TIA.

    Edit: https://makeskyblueusa.com/product/3...ge-controller/
    Last edited by fw12; 09-27-2020, 09:09 PM.

  • #2
    Basically yes. MPPT Controllers are Power Converters. If you know how they work can quickly determine maximum input power. Take the Current rating and multiply it by the Battery voltage. 24 x 30 = 720 watts.

    Having said that you can over size up to about 10% keeping in mind anything over 30 amps output is clipped off and maximum output will still be 30 amps no matter how high you go over. Going beyond 10%, and you risk burning up your controller. Consult your manufacture instructions.
    Last edited by Sunking; 09-28-2020, 11:52 AM.
    MSEE, PE

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    • #3
      Good explanation.
      Thanks.

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