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  • 25 volt charging 24 volt system

    I have 4 panel AP6-170
    detail is
    rate power = 170 watt
    rated voltage= 25.0
    open circuit volt=32.2
    rate current =6.8
    can I use this panel with charge controller charge 24 volt battery system
    please help
    thank

    and how to connect on Parallel or series
    help

  • #2
    Originally posted by hieudao View Post
    I have 4 panel AP6-170
    detail is
    rate power = 170 watt
    rated voltage= 25.0
    open circuit volt=32.2
    rate current =6.8
    can I use this panel with charge controller charge 24 volt battery system
    please help
    thank

    and how to connect on Parallel or series
    help
    Basically, you can use four of those panels in series, feeding into an MPPT type CC which can handle up to about 200V DC input, or else put them in two series strings and use a CC than can handle at least 100V DC input. (The panel Voc will increase in cold weather. Do you have winter where you are?)
    SunnyBoy 3000 US, 18 BP Solar 175B panels.

    Comment


    • #3
      24V batteries need about 30V for charging, so you need enough panels to reach about 35V on a hot day to be safely assured of charging.

      Because of inefficiencies at high voltage in MPPT controllers, I would advise only 2 panels in series, and then 2 of those strings in parallel.

      (I'm running 170V into 48V batteries and have issues with excess heat in the 200V controller)
      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


      • #4
        Originally posted by Mike90250 View Post
        24V batteries need about 30V for charging, so you need enough panels to reach about 35V on a hot day to be safely assured of charging.

        Because of inefficiencies at high voltage in MPPT controllers, I would advise only 2 panels in series, and then 2 of those strings in parallel.

        (I'm running 170V into 48V batteries and have issues with excess heat in the 200V controller)
        Me thinks your MPPT controller should be more efficient than that. Bruce Roe

        Comment


        • #5
          Originally posted by bcroe View Post
          Me thinks your MPPT controller should be more efficient than that. Bruce Roe
          Me too, especially after all the hype about how good they are.
          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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