Photovoltaic (PV) systems are generally divided into two major
categories: grid-connected (also known as grid-tied) systems that are interfaced to an electricity grid and stand-alone systems that are self-contained. Since the 1990s the market has shifted decisively toward PV power plants and installations on buildings connected to an electricity grid. In 2000 grid-connected PV had overtaken stand-alone systems in global market share, and in 2016 more than 98% of solar cell production was being deployed in grid-connected systems.
An on-grid or grid-tied solar system is a system that works along with the grid. This means that any excess or deficiency of power can be fed to the grid through net metering. Many residential users are opting for an On-grid solar system as they get a chance to enjoy credit for the excess power their system produces and save on their electricity bills. You will always have power either from the solar system or from the grid. They do not have batteries.
