The area required for a minimum of 1 MWp rooftop solar PV system can vary depending on several factors, including the efficiency of the panels, the angle and orientation of the roof, and the local climate. As a general rule of thumb, a 1 MWp system will require around 10,000 sq. meters (1,00,000 sq. feet) of flat, unshaded roof space. However, this is just a rough estimate, and it is crucial to consider the specific conditions at your location when determining the size of your solar PV system.