Grid tie solar systems and On-grid systems are the same mostly used by businesses and homes. In this system battery storage is not required and these systems are directly connected
to the public electricity grid. Solar power generated by the ongrid system that is not used in home directly export to the electricity grid and the owner get paid for the exported energy through FIT (Feed-in-tariff)
Grid-tied, on-grid, utility-interactive are all terms used to describe the same concept-a solar system that is connected to the utility power grid. Electricity generated during daytime is consumed and excess units are exported back to the Grid.
During nights when solar is not available, power will be drawn from the Grid