Solar charging using P20L

Discussion in 'Charge Controllers' started by jobrofin, Nov 25, 2020.

  1. Supppose you had 2 solar charging systems. One had 1 100watt solar panel connected to 2 GC-2 batteries in parallel and the other is the same other than replacing the 100watt panel with a 200watt panel. Assuming that each panel is connected until the arrow flashes on the P20L is the amount of watt/hrs of charge using 1 100watt panel the same as using 1 200watt panel? So in other words, will I have the same amount of charge using either panel, so long as the arrow is flashing on the P20L?
  2. TomT

    TomT WindyNation Engineer

    It's really hard to tell.
    PWM drops panel voltage to battery voltage.
    Then you use current and battery voltage for watts.
    Being a 200 watt will be a much higher voltage.
    You are going to lose alot of your power.
    Better to add another 100 watt panel in parallel.

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