What is a 3 kw solar system? A 3-kW solar system refers to a photovoltaic (PV) system with a power output of 3 kilowatts. It is a measure of the system's capacity to generate electricity from the sun's energy. The power output of a solar system is determined by the combined capacity of the solar panels installed. In this case, a 3-kW system typically consists of solar panels with a total...