3 panels - 2x100 watt 1x205 watt

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  • KirkB
    Junior Member
    • Apr 2014
    • 22
    #1

    3 panels - 2x100 watt 1x205 watt

    I'm looking to acquire two 100 watt panels to go with my 205 watt for my rv. I can't place another 205 watt of the same size due to roof real estate. The two 100 watts panels will match the amps of the 205 when wired parallel. I'd like to then wire the sum of those two panels to the 205 watt panel in series. This will allow for three panels running the length of my passenger side of the rv with no shadows or obstructions.

    Wanted to know if this is considered acceptable or not.

    Thanks,

    Kirk
    Tags: None
    • inetdog
      Super Moderator
      • May 2012
      • 9909
      #2
      Originally posted by KirkB
      I'm looking to acquire two 100 watt panels to go with my 205 watt for my rv. I can't place another 205 watt of the same size due to roof real estate. The two 100 watts panels will match the amps of the 205 when wired parallel. I'd like to then wire the sum of those two panels to the 205 watt panel in series. This will allow for three panels running the length of my passenger side of the rv with no shadows or obstructions.

      Wanted to know if this is considered acceptable or not.

      Thanks,

      Kirk
      If the Vmp values match well enough (sum of two being within 5% of the single), then as long as you do not get uneven shading across the panels it should be OK. So watch where you park when deploying the panels.
      Also make sure that the sum of the voltages is within the working range of the CC.
      SunnyBoy 3000 US, 18 BP Solar 175B panels.

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        • KirkB
          Junior Member
          • Apr 2014
          • 22
          #3
          Originally posted by inetdog
          If the Vmp values match well enough (sum of two being within 5% of the single), then as long as you do not get uneven shading across the panels it should be OK. So watch where you park when deploying the panels.
          Also make sure that the sum of the voltages is within the working range of the CC.
          Yup. Found panels that would keep Vmp within 2% of my 205w panel. All of them will be mono crystalline if that matters.

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