rooftop PV system, is a photovoltaic (PV) system that has its electricity-generating solar panels mounted on the rooftop of a residential or commercial building or structure.[1] The various components of such a system include  and other electrical accessories.

Rooftop mounted systems are small compared to utility-scale s ground-mounted  with capacities in the megawatts range, hence being a form of st rooftop PV stations are power system Rooftop PV systems on residential buildings typically feature a capacity of about 5 to 20 kilowatt(kW), while those mounted on commercial buildings often reach 100 kilowatts to 1 Megawatt (MW). Very large roofs can house industrial scale PV systems in the range of 1-10 Megawatts.

The urban environment provides a large amount of empty rooftop spaces and can inherently avoid the potential land use and environmental concerns. Estimating rooftop solar insolation is a multi-faceted process, as insolation values in rooftops are impacted by the following: