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The 25 year expected lifespan is a little troubling to me. Do they just stop working? Do they impact the structure of the house? (When you move 10 years from now, are the inspectors going to report that the solar panels are "approaching the end of their useful life" and scare off potential buyers?) Are they guaranteed for 25 years? Are they expensive to insure?

As far as resale . . .I know this varies HUGELY, but my in-laws looked at a house with passive solar hearting (heating is pretty important here in MN -- and our solar panel potential is pretty limited) and based on its marketing, price, and time on market, that aspect of the house was considered a negative.