I was reading about DIY Solar panels as you do and found this great wossname.
Over the Xmas period you will probably overdue it.
those nutters over at instructables.com have a Make on how you can do it yourself.
As I was making bath bombs to give for Christmas I felt a little heartburn. I reached for the Alka Seltzer… Wow… $8.99 for 36 tablets! One dose is made of 2 tablets, so that comes to 50 cents per dose. Then I looked at the active ingredients. Citric acid and sodium bicarbonate.