or where can u buy parts for one?
DIY Build Solar Kit
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http://www.fieldlines.com/story/2005/1/5/51211/79555
The construction method shown here is flawed. The homemade panels start out working very well, but they succomb to moisture in the atmosphere, wind vibration, and expansion/contraction due to temperature differentials. Over time the silicon cells crack and electrical output drops severely, or even stops altogether. The soldered tabbing lifted off the front surface of the panels and I could not find a satisfactory way to clean the contacts after exposure to the elements so they could be resoldered.
I wouldn’t try to build your own solar panel. Here are some relatively cheap ones:
http://www.northerntool.com/webapp/wcs/stores/servlet/category_6970_770399+6228
You don’t. They require thin layers of high purity
materials that you simply won’t be able to work with.