According to the PV Magazine USA, annual rooftop solar installations more than double when a homeowner's long-term "profit" on a system increases from zero to $1,000, a new study shows. The numbers of systems are based on an average residential rooftop PV system size of 5kW.

The rooftop solar adoption model was based on solar installation data from California, Massachusetts, Arizona, Germany and Japan from 2005 to 2016. A study presenting the model was published in the journalRenewable Energy.

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