On-grid solar system is widely used in household and commercial scenarios as well as large PV plants, and can generate power directly by connecting PV modules, inverters and the utility grid. In household and commercial on-grid solar system, solar energy can be used to satisfy the load first and then (if any surplus) supplied to the grid to cut users’ power cost and generate income. On-grid solar systems are often characterized by string distribution, medium and high voltage, and small currents.
