I don't want to rain on your parade, but;
we've had seminars about this lately:
The consensus is that a lot of people talk about going green, but when it comes to putting up the money, they back down.
The situation is that Solar only returns about 50% of the investment at reasle time.
It is a fact that in the long term, it is a good investment for the Homeowner;
But is wouldn't advise my client to do it just before selling.
But, please get more input.
Good luck and may God bless