A January 2015 study by the Lawrence Berkeley National Laboratory found that homebuyers would be willing to pay an extra $15,000 for a home with an average sized solar array, as compared to a comparable house without solar, and would be willing to pay a premium for a home with a leased solar system. However in most cases the value of solar systems are not incorporated into a home's resale value.
The problem stems largely from a lack of home appraiser training and industry standards for these new technologies. For example, only a few hundred appraisers have taken a course on the details of appraising solar. While customers are becoming more open and willing to spend greater amounts of money for solar panels, appraisers, and banks or lenders are untrained in valuing green home features. For example, homebuyers typically cannot qualify for a larger mortgage based on the fact that a solar system will boost household income by reducing monthly electricity bills.
There have also been reported problems of the sale of homes with 3rd party financed systems because the contract terms confuse or deter potential buyers.
Further education and training is needed to more accurately value solar on rooftops.