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  • Solar Panel to power axial fan

    What do I need to power a 12V, 3.5W axial fan. I don't need it to run at capacity, only to move air through a solar collector.
    I was wondering if a direct hook up to a 12V, 5W panel would work or do I need something to regulate.

  • #2
    sounds like something i was just talking about, i will be watching this.

    Comment


    • #3
      using a DC brusless fan, you should be ok with a direct panel connection. use a 10W panel for a 5 w fan, and put a 25V 200uF cap & 13V 10w zener diode on it, to protect the fan. The fan will not always start reliably in low light, but most brushless fans have restart ckts in them and they will eventually start up
      spreadsheet based voltage drop calculator:
      http://www.solar-guppy.com/download/...calculator.zip
      http://www.solarpaneltalk.com/showth...oss-calculator

      http://www.mike-burgess.org/PVinfo_2.html

      solar: http://tinyurl.com/LMR-Solar
      gen: http://tinyurl.com/LMR-Lister ,
      battery lugs http://tinyurl.com/LMR-BigLug
      Setting up batteries http://tinyurl.com/LMR-NiFe

      gear :
      Powerfab top of pole PV mount | 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

      Comment


      • #4
        Originally posted by Mike90250 View Post
        using a DC brusless fan, you should be ok with a direct panel connection. use a 10W panel for a 5 w fan, and put a 25V 200uF cap & 13V 10w zener diode on it, to protect the fan. The fan will not always start reliably in low light, but most brushless fans have restart ckts in them and they will eventually start up

        Is there a diagram to help me wire this? Where would I get the diode and cap?

        Comment


        • #5
          I did not draw a schematic, and parts should be at any good electronics store. I'll see if I can sketch up something later today and post it.
          spreadsheet based voltage drop calculator:
          http://www.solar-guppy.com/download/...calculator.zip
          http://www.solarpaneltalk.com/showth...oss-calculator

          http://www.mike-burgess.org/PVinfo_2.html

          solar: http://tinyurl.com/LMR-Solar
          gen: http://tinyurl.com/LMR-Lister ,
          battery lugs http://tinyurl.com/LMR-BigLug
          Setting up batteries http://tinyurl.com/LMR-NiFe

          gear :
          Powerfab top of pole PV mount | 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

          Comment


          • #6
            Fan

            Well myself i just hooked a computer fan at 6v at 3 amps and it worked at 12v it spins faster. My test panel was a 15*3x6 1.8 watt cells.

            Comment


            • #7
              Originally posted by Yisrael48 View Post
              Well myself i just hooked a computer fan at 6v at 3 amps and it worked at 12v it spins faster. My test panel was a 15*3x6 1.8 watt cells.
              I never thought of that. I have several computers at work that no longer work, I may rob the fans out of them.
              So, you just hooked up the solar panel leads drirectly to the fan?

              Comment

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