Image may be NSFW.
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We love wind power for RVing--used it for years. When we boondock the desert or the beach--or any other area with a good source of wind, we run up our wind turbine and let it complement our solar panels. Still, commercial wind turbine systems aren't altogether inexpensive. But hang on, if you're handy with a few tools and can scrounge a bit, you may be able to build yourself a 100-watt wind turbine inexpensively.
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The heart-and-soul of this little machine is a recycled treadmill motor; the designers suggest you may be able to scrap one out of a freebie treadmill; we think you'll be likely to find a used one on a nearby Craiglist sale. In any event, the little treadmill motors put out a lot of juice for a small number of revolutions.
The next question we had was: What about blades? The basic "propeller" as some call it, is generally a three blade operation. On our commercial turbine a set of blades sets us back nearly $100. Not so here, the blades are built out of a chunk of PVC drain pipe. Gimme a break! This obviously isn't rocket science. Image may be NSFW.
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Check out the website of the good folks of Vela Creations. They offer a FREE detailed manual on how to build your own Chispito Wind Generator with pretty much common tools and cheap parts.