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12 Volt Wind Power

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Posted by Ian Bee on October 21, 2003, 8:11 am
I enjoy camping here in South Australia.  I use a Waeco 12 v Fridge
along with another 12 v standby battery ( Waeco - Blue Apple ).

This system allows me to sustain my fridge for around 24 hours, after
that I have to start recharging by stand by battery using my cigarette
lighter in my vehicle.


Here in Australia, you can buy units that fit in front of automotive
Radiators that in essence, are another fan & motor.  They are connected
to your car's thermostat, and cut in & out depending upon engine

Now, here's the thing...  can i get one of these, place it in the wind &
generate power?  I am led to believe that these units are permanent
magnet motors.

The reason I ask this is because these units are relatively speaking,
cheap and readilly available.


Ian Bee

Posted by Vaughn on October 21, 2003, 10:33 am


     Only if you often have winds of 40 to 50 MPH.   It would be better to
look at the 12V. wind generators that are marketed to boaters, but they are
not cheap.  They are designed to generate significant power at more normal
wind speeds.


Posted by uguess on October 21, 2003, 9:32 pm
 On Tue, 21 Oct 2003 17:41:06 +0930, ianbee@ihug.com.au (Ian Bee)

One of the common assumptions I often hear is that a fan with motor
will make a good windmill and generator.  If you notice the angle of
the blades on a fan, as opposed to the angle of the blades on a
windmill, you will often see a large difference in the pitch of the
blades.  This is due to basically a difference in angle of attack, and
direction of desired "lift".  In the case of a fan, the effective
"lift" is down the length of the propellor shaft to move air down the
length of the shaft.  In a windmill, the desired lift angle is 90
degrees off from the shaft to provide torque to the shaft.
So, while some fans will work as a windmill, they are not at the most
efficient angle and can never compete with devices designed for that

Posted by Steve Spence on October 21, 2003, 11:08 pm
 the blade pitch and design on a cooling fan is very different than on blades
meant to be pushed by wind. you could make your own blades ......


Steve Spence

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