In a state like California, for example, a small 3.1-kilowatt (kW) system can add an average of $18,324 to the value of a medium-sized home.
The property value advantages of solar energy only increase as you scale up. Installing 5kW of solar panels adds an average of $29,555 to the retail value of a medium-sized home.
In other words, with the right-sized installation, solar energy is an investment that potentially pays a 200%+ return – far an excess of most any other financial vehicle you can imagine.
For more information, check out the following article: http://costofsolar.com/is-my-home-worth-more-with-solar-energy/