MPPT controllers

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  • glock15
    Junior Member
    • Jul 2010
    • 9
    #1

    MPPT controllers

    After reading a little about the Mppt controllers I understand that excess voltage is turned into current at the controller. But dose that also give me the ability to run my panels in series creating 40 or 60 volts and then having the volts converted to amps for 12 volt system at the controller. If so is there a downside to doing so? the obvious up side being running a lighter wire size and less loss of power in wiring.
    Tags: None
  • Mike90250
    Moderator
    • May 2009
    • 16020
    #2
    You nailed it ! go to the head of the class.
    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

    • Sunking
      Solar Fanatic
      • Feb 2010
      • 23301
      #3
      Pretty much on point.
      MSEE, PE

      Comment

      • Chanz
        Junior Member
        • Jun 2010
        • 19
        #4
        I have question about MPPT controllers that most of them they take up to 40v. 12v solar panel have open voltage of 21.6. when connecting 2 panels in series will produce 43.3v. Will that damage the controller in any way will that affect charging 12 battery under full sun?

        Comment

        • Sunking
          Solar Fanatic
          • Feb 2010
          • 23301
          #5
          Originally posted by Chanz
          I have question about MPPT controllers that most of them they take up to 40v.
          Maybe some inexpensive off brands, but most up around 150 volts Voc
          MSEE, PE

          Comment

          • Mike90250
            Moderator
            • May 2009
            • 16020
            #6
            Originally posted by Chanz
            ...... 43.3v. Will that damage the controller in any way will that affect charging 12 battery under full sun?
            Best to follow the directions the mfg gives, if they say 40V, and you fry the controller with 43.3V, then it likely won't charge the battery anymore.

            There are some good , small amp controllers, Morningstar 15A MPPT, Rogue MPPT, Blue Sky MPPT that have varied input voltages. When you get to the higher amp controllers, 45, 60, 80A, then you have higher voltage DC inputs.
            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

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