It seems to me appealing to put the solar power on the barn rather than the house:
- It has a much larger area (ie more power)
- The cosmetic impact from the road will be lower
Secondly - the sheet metal on the barn roof is a few decades old. While the roof isn't in imminent danger of failing, about 50% of the roof area now looks rusty and about 50% still has the galvanized surface. I've already had a contractor offer to cover the roof with an aluminized asphalt product to extend the life of the metal. Clearly, it's not desirable to attach solar modules to metal with a noticeably shorter life than the modules.
One idea that occurs to me is to use an aluminized asphalt product to adhere the modules to the metal, and cover the whole roof at the same time in the interests of preserving it.
Does anyone have any experience with a similar situation?