The size and efficiency of the solar panels, in addition to the specific requirements of the system, will determine the number of solar panels that are required for a system that generates 5 kW in South Africa. In general, there will be a need for approximately 20 to 25 solar panels in order to power a 5 kW solar system. This is only a rough estimate, however, and the actual number of panels that will be required may be either higher or lower depending on the particulars of the system.
It is recommended to consult with a solar panel installation company or engineer in South Africa in order to determine the precise number of solar panels required for a solar power system with a capacity of 5 kW. They will be able to assist you in calculating the specific requirements of your system based on a variety of factors including the size of your roof, the orientation of the panels, and the manner in which you typically make use of energy.