On-grid solar systems are connected to the utility grid and allow you to use electricity from the grid when solar power is insufficient. Off-grid solar systems are not connected to the utility grid and rely solely on solar energy and batteries for power. On-grid systems are the most common type of solar panel system in the United States. They are designed to work in tandem with the utility grid, which means that when your solar panels produce excess electricity, it is fed back into the grid and you receive credit for the excess energy. On the other hand, when your solar panels do not produce enough electricity to meet your needs, you can draw electricity from the grid. Off-grid systems are used in remote locations where access to the utility grid is not available or is prohibitively expensive. These systems require a battery bank to store excess energy for use when the sun is not shining. Off-grid systems are typically more expensive than on-grid systems because they require more equipment.