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-   -   Since I've got a 12vdc circuit in my house... (http://www.physicsforums.com/showthread.php?t=419897)

dlgoff Aug2-10 06:08 PM

Since I've got a 12vdc circuit in my house...
 
I've been thinking about this for a long time and now I have the time to do it.

Back in the old days, people would use wind chargers like this
http://www.mccr.net/Wind/Images/old_generator.jpg to do various task; sometimes charging a battery for light in the evening.

Well, one of my friends has a small manufacturing business making carbon-composite components for wire industry machines. Anyway, I've helped him a lot and he lets me play if I want to test out an idea.

So I designed/came up with a method to make a carbon blade for a "small wind charger" (I'm thinking a single blade about 14 feet in diameter; w/ a 2" aluminum spare in it). Sounds big but it'll be really easy to handle since it won't have a lot of mass.

Also, I've been looking into surplus aircraft dc generators. I will keep a bank of batteries outside the house in a protected area and feed either 12 or 24 volts onto my existing dc circuit. Right now it has 12 incandescent bulbs, but LED.... here we come. I don't even need an inverter.

I'm still trying to figure out how much HP my 14' blade will capture (I think around 75 @ 30mph?), so I can determine if I can spin the generator at the right rpm. i.e. I don't want anything so large that if my batteries are down, the thing can move.

Here's a 2400watt one that's kind of cute. They say that it take 2HP/1000watts:
http://cgi.ebay.com/ebaymotors/ws/eB...5209&viewitem=
But it has a 120vac output :(

I'll probably use one like this 24vdc unit:
http://cgi.ebay.com/ebaymotors/ws/eB...2815&viewitem=. My design calls for coupling to and speeding up the generator with a belt. This way, the generator can remain stationary while the blade shaft adjust for the winds direction.

So basically I'm reinventing the "wheel", I mean the wind charger.


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