A rooftop photovoltaic power station, or rooftop PV system, is a photovoltaic system that has its electricity-generating solar panels mounted on the rooftop of a residential or commercial building or structure. The various components of such a system include photovoltaic modules, mounting systems, cables, solar inverters and other electrical accessories.
Rooftop mounted systems are small compared to ground-mounted photovoltaic power stations with capacities in the megawatt range. Rooftop PV systems on residential buildings typically feature a capacity of about 5 to 20 kilowatts (kW), while those mounted on commercial buildings often reach 100 kilowatts or more.
Image source: https://lh3.googleusercontent.com/8bAOxwr8P8UNUjJtj8WIWgrZkQo9i8VQn7uOFEn5c-WruQbGnJuz0hBRNJRwTZE6hNZHteyY=w1080-h608-p-no-v0