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Thread: Solar Panel to power axial fan

  1. #1
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    Default 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. #2
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    sounds like something i was just talking about, i will be watching this.

  3. #3
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    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
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  4. #4
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    Quote 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?

  5. #5
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    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.

  6. #6
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    Default 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.

  7. #7
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    Quote 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?

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