Here are some facts for you folks thinking of going Solar and putting them on your roof. My panels are 7 years old, I have a total of 6 panels, 3 have already went bad. The output of them are decreasing every year. I now have some mold in places I've never had before. Some shingles on my roof are going bad because, Asphalt shingles (NEED) sunlight/heat to keep them sealed down according to a respected roofer here in the area. Panels hide sun light, I would never do this again and just know, unless you buy your own panels, you have NO idea what you're getting. Mine are Chinese Junk!