When a solar system is owned, value is added is added to the home, and appraisers are required to determine that amount. To do so, basic information such as the age and capacity of the system should be provided by the seller. Then, like any other amenity, the appraiser needs to find comparable homes with owned solar panels to compare to the subject home. The problem is that those type of comparables often aren’t available. And when they aren’t, the appraisal industry hasn’t agreed on some other measure to value the systems. As a result, the amount of the value increase has tended to be inconsistent. Next in Part 3: Average Values.