this type of DIY solar panel is the most sealed from water. I have made wood frame and all seem to get moisture in them. I still make them but they are good under a roof or eve .
This diy solar panel was made with all cracked 3"x6" solar cells to see if I could get the same power out of them, on the next steps I will show what all I did. http://sites.google.com/site/earthforsolar/glass-frame-diy-panel
looking for solar cells www.solarcells101.com
Step 1: Soldering tabbing wire on solar cells
I will cut two pieces of tabbing wire 6" long. Then I soldered all the backs first. http://sites.google.com/site/earthforsolar/glass-frame-diy-panel
On this set of solar cells I used cells that were cracked all the way across, I soldered the tab wire on the back first then I used packaging clear tape and taped the bottoms. This made the cell stronger and helped to keep them from braking more in the soldering and diy solar panel making process .