Solar panels are an expensive proposition. I'll look up the links later, but average installation cost runs about $30-45K for a total conversion. The warranty on the installation is due to the complexity of the work, and reliability depends in large part on the contractor.

About 1/2 of that cost is absorbed by tax credits and other programs, but it depends on your state laws.

(I have 70+ feet of south facing roof and a constant breeze so I'm seriously looking into converting in the quasi-distant future to a wind/solar installation)