On-grid systems tie into your public utility's power grid, allowing you to produce energy and sell it back to your utility. There are no expensive batteries, although battery systems can be added to on-grid systems. Instead, on-grid systems typically produce power that is fed onto the grid and your utility will purchase what you produce during daylight hours. Your home or business continues to buy electricity when your solar system isn't producing enough for your needs. These systems typically result in net-metering, where your monthly power bill will reflect credits for the amount of energy you sold to the utility and charges for the amount of energy you used from the utility.