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Old 02-21-2012, 02:08 PM
tom7891 tom7891 is offline
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Default Charging small battery using wind?

Hi, i was just wondering if it's possible to charge a small battery with a small wind turbine? The turbine is just a coil of thin wire with a permenent magnet inside, the coil is only the size of a thumbnail.
When i test for voltage across the turbine i get no voltage, which i'm assuming is because of the resistance on the multimeter i'm testing it on. I'm guessing if it will charge the battery, it'll take a while?

The battery has around a 5v output. Sorry if i'm being vague, but i don't really know a lot about this. Any help would be appreciated.
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Old 02-21-2012, 03:07 PM
Audioguru Audioguru is offline
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Use a DC electric motor that has permanent magnets inside. It makes a good generator.

Did you make the "turbine" yourself? Does it spin fast with lots of power when you connect it to a powerful battery? Or is it an AC turbine instead of a DC one?
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Old 02-21-2012, 03:08 PM
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Multimeters usually have high resistance for voltage testing, so you can't blame it. There appears to be somethign wrong with your generator.
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Old 02-21-2012, 03:29 PM
tom7891 tom7891 is offline
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I nicked the turbine from a wind powered phone charger. I'm making a wind powered phone charger for a project at college, so i thought i'd use a turbine that was built for the job. It looks like a bridge rectifier is in the charger circuit, so looks like it's a dc turbine.
I've managed to get some voltage from it, but only 0.5v, and it fluxuates a lot.
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Old 02-21-2012, 04:52 PM
Audioguru Audioguru is offline
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I have never heard of a "wind powered phone charger".
Does it charge the phone when you are holding it while sky-diving at 120mph?
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Old 02-21-2012, 05:06 PM
tom7891 tom7891 is offline
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It's supposed to charge the phone when on a bike. Good idea though
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Old 02-21-2012, 05:16 PM
Audioguru Audioguru is offline
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A year or two ago a kid wanted to use a little computer fan as a generator to charge the battery for his bike's lights. He didn't understand that it needs a huge windmill to produce enough power and the power comes from him pedalling harder, not from the wind.
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Old 02-21-2012, 06:01 PM
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Quote:
Originally Posted by Audioguru View Post
I have never heard of a "wind powered phone charger".
Does it charge the phone when you are holding it while sky-diving at 120mph?
http://www.envirogadget.com/odd-gadg...hones-concept/
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Old 02-21-2012, 06:15 PM
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The "iFan" is a "Concept Design" from Holland where the wind blows like crazy!
The designer also talks about holding it outside a car window while driving.
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