2Frazzled, I am sorry that I missed seeing your post earlier a couple up about the flex panels.
Yes, I too had read about the panels and heat. It has not been a problem for me so far. I took a infrared digital thermometer up on the roof and measured in full sun and really didn't detect a significant difference between the rest of the PC roof and the panels. I could detect no heat inside the coach immediately below the panels. There has been no change in the roof that I can observe and I check it out pretty carefully, particularly when I wash the roof a couple of times a year. When traveling, I will also sometimes go up there and wipe down the panels with a damp cloth to clean them from dust and rain, etc.
Finally, no, I can't discern any problem I have experienced. BUT, let me tell you two factors that would come into play in how we use our PC. One, it is used about two months total in a year. Two, when not in use it is stored in a completely enclosed garage which is totally dark with no sky lights, etc. So, the panels are exposed only about 1/6th of the year during daylight only. I have no idea the consequences of continual use/exposure. All I know is it works for me.
I have detected no voltage or amperage deterioration in either panel since I installed them several years ago. Now, I handled that flex panel very carefully and only flexed it crosswise on the roof for installation. I didn't try to see how "flexible" its limits were and I handled it carefully. On a house, of course, you would have 365 days of exposure to a house and the elements and if your RV was stored outside I guess the same would apply.
Like I said, all I know is it works for me and it is working better than I expected.
Finally, I would add that I think a small dc wind generator is an interesting thought for charging the batteries. I actually saw a couple full timing in a Roadtrek Class B 190 (the middle size RT on a Chevy chassis, about 20 feet long and no wider than the original unmodified van).
They had a small wind generator on an extension pole and a couple of solar panels. The guy had designed it himself and was a retired professor from one of the major state universities. Engineer? I inquired. Nope, taught philosophy. Go figure. He loved his wind generator and said they never lacked for power in their full time use. I guess where there is a will there is a way. His Roadtrek had stuff hanging all over it!!
Paul