When both the source (Grid and Solar) available then your load at home will run from solar first, if your running load is more then 1 kw then it automatically takes from the main grid. This system is generally for small family where running load is approximately 800 Watt. 1 kw solar system generate average 4 unit in a day.
Solar energy is the energy that is produced by the sun in the form of heat and light. Solar energy is produced by the Sunlight's – photovoltaic energy – and its warmth. Its produces heat and it generates the electricity with help of solar panels. Sun is one of the most renewable and readily available source of energy on planet Earth.