Grid Tied PV System
A grid-tied system is a PV system connected to the power grid that allows you to sell excess electricity back to the utility.

A grid-tied PV system's output is directly linked through your meter to the distribution lines that normally provide you with electricity. In this way, the grid both effectively "stores" any excess power produced by your PV system, and supplements power when your demand for electricity is greater than the supply your PV system produces, thus avoiding the need for batteries. As an option, you can choose to install a grid-tied PV system with batteries that will both allow you to send excess power to the grid, while providing backup power for your critical loads in the event of a power outage.