2 panels 1 controller

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  • DanQ
    Junior Member
    • Mar 2018
    • 2
    #1

    2 panels 1 controller

    Hi after some advice, i have a 125w panel on the jayco roof and a 300w portable foldable panel can i run these 2 panels through a single 40amp controller?
    125w specs:
    max power voltage 18.4v
    open circuit voltage 21.9v
    300w specs:
    max power voltage 18v
    open circuit voltage 21.24v
    thanks Daniel
    Tags: None
    • Mike90250
      Moderator
      • May 2009
      • 16020
      #2
      It looks like it's OK, as long as you are under 40A, the panel voltages match really well for wiring in parallel
      Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
      || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
      || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

      solar: http://tinyurl.com/LMR-Solar
      gen: http://tinyurl.com/LMR-Lister

        Comment

        • DanQ
          Junior Member
          • Mar 2018
          • 2
          #3
          My main issue is I've heard i possibly need to install blocking diodes in both panels, as in if 1 panel is in the shade and the other in full sun?

            Comment

            • Mike90250
              Moderator
              • May 2009
              • 16020
              #4
              No blocking diodes ever needed with panels made after 1968.

              Delete the word diode from your solar vocabulary, until you are educated enough to be able to break the seal on a panel,and replace a Bypass Diode, and reseal the panel.
              Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
              || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
              || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

              solar: http://tinyurl.com/LMR-Solar
              gen: http://tinyurl.com/LMR-Lister

                Comment

                • bcroe
                  Solar Fanatic
                  • Jan 2012
                  • 5198
                  #5
                  Originally posted by DanQ
                  My main issue is I've heard i possibly need to install blocking diodes in both
                  panels, as in if 1 panel is in the shade and the other in full sun?
                  Even a shaded panel will generate up to full open circuit voltage (but little current), so no blocking diode
                  is needed to prevent reverse current flow from the unshaded panel. Bruce Roe

                    Comment

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