Ron
I started building my own about a month ago and no real success yet. One big problem is they come with the front tabs on, then when I unwaxed them some or alot of tabs come off. I thought no problem so re-solder/cleaned etc and looked good. So my panels worked for a week the tabs opened up. So now have reopened them and using liquid silver to try to save the project. It is alot of work and would spend the extra money for good clean cells next, but not for me right now. I got some other waxed cells from another source and all front tabs stayed on. You can save money but buying pens at 20 bucks each and endless time. I was told cells should be sold in bundles of 10 and wrapped in tight plastic, so clean and no problems, but cost more. So ask me in a year from now and might of pulled all my hair out!
Wayne