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PV Value® is a web-based tool that calculates the energy production value for a residential or commercial photovoltaic (PV) system. The tool is Uniform Standards of Progressional Appraisal Practice compliant and has been endorsed by the Appraisal Institute for the income approach method. Valuing a PV system is done using an income capitalization approach, which considers the present value of projected future energy production along with estimated operating and maintenance costs that are anticipated to occur during the PV module power production warranty timeframe.
Resource Link: http://energy.sandia.gov/?page_id=8047