I came by this article that explains the resistance of the solar panels. http://www.renewableenergyworld.com/rea/blog/post/2010/08/the-strength-and-durability-of-solar-panels
I hope you will find interesting to know that hail usually is not a big concern to solar panels. They are usually design to resist moderate hail. Many homeowners will observe that the tree limbs are way more dangerous for the panels and for the house. We want to emphasis that is still very important to insure the solar panels.
I am a contractor in North Carolina, South Carolina, Georgia and Virginia. I can tackle any residential project big or small. One advantage is even if we perform a small renovation, we keep in mind the whole house. Please feel free to ask any question