A grid-tied solar system, also known as a grid-connected or "on-grid" system, is a type of solar power system that is connected to the electrical grid. This means that the solar panels generate electricity that is used to power the home or business, and any excess electricity is sent back to the grid. The system is connected to the grid through a net meter, which measures the amount of electricity produced by the solar panels and the amount of electricity used by the home or business. If the home or business is producing more electricity than it is using, the excess electricity is sent back to the grid and the homeowner is credited for the excess energy produced.