[PV]2 is a web application that allows homeowners to determine a complete cost of ownership for residential rooftop solar photovoltaic (PV) systems including purchase and operation through the system’s service life. The goal of [PV]2 is to assist homeowners in making economical decisions related to solar PV. The current version is focused on allowing a homeowner to evaluate the cost-effectiveness of a specific solar PV system from a proposed contract from a solar installer. The homeowner will need information from the solar installer contract and their electricity bill.