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44v vs 88v effect on mppt

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  • 44v vs 88v effect on mppt

    Besides the help of getting to voltage earlier, what other effects of series parallel connection of
    4 x 100w panels?

  • #2
    Originally posted by Brian53713 View Post
    Besides the help of getting to voltage earlier, what other effects of series parallel connection of
    4 x 100w panels?
    If your array is close to the controller, use parallel. More efficient.
    If you array is far from the controller, use series, That way you can use thinner wires.

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    • #3
      Originally posted by Brian53713 View Post
      Besides the help of getting to voltage earlier, what other effects of series parallel connection of
      4 x 100w panels?
      Huh? Electricity travels at the speed of light.

      If you run the panels in parallel eliminates half the benefits of a MPPT controller and will cost you a lot more in wiring and hardware like combiners and over current protection devices.

      MSEE, PE

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      • #4
        I think "getting to voltage earlier," is the misconception that there can be more power in series at very low light levels in the early morning.

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        • #5
          50 ft away, 8awg . Just started using branch connectors for cold months, to keep well below 100v . Series -parallel. 22.5 Voc .4 x 100 w

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          • #6
            Originally posted by Brian53713 View Post
            50 ft away, 8awg . Just started using branch connectors for cold months, to keep well below 100v . Series -parallel. 22.5 Voc .4 x 100 w
            Well lets have some math fun with this.

            Let's go parallel. You will need a combiner with 4-position Breaker$. To keep wire losses to 2% or less at 50-feet one way @ 23.5 amps will require 1/0 AWG copper cable that cost you $2.10.ft x 100 feet. Several hundred dollar$.

            Lets go Series and use a 150 Voc Controller. 2% loss at 5.55 amps requires 14 AWG that cost 10-cents per foot or around $10.

            Any questions?

            MSEE, PE

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