Whenever the sun shines (and even in overcast weather), the solar cells generate electricity. The grid connect inverter converts the DC electricity produced by the solar panels into AC electricity, which can then be used by the building loads.

-The sun shines on the solar panels generating DC electricity
-The DC electricity is fed into a solar inverter that converts it to AC electricity.
-The AC electricity is used to power appliances in your building.
-Surplus electricity is fed back into the main grid.