From a marketability perspective, yes! Homes with solar panels are much more desirable than homes without solar panels.
What people WILL put their money on the table to buy is results, outcomes, benefits and solutions.
Package your solar panels around one of those and you just might have a asset you can leverage.
They install the whole system for free!
What is your current value? I would try to find out your current real estate value then what is the cost to put the solar panels in.
To find the current real estate value you have options;
You can go to http://realestatevalues.us
You could contact a local real estate agent
or you can hire an appraiser.