There are various factors to consider when going solar. The type of solar setup will determine your electricity connection to the local utility’s electricity grid. The type of system selected is decided by your needs.
Grid Connected Solar System is connected to the local utility’s electricity grid. Excess electricity generated can be exported back to the grid. Supplemental electricity can be transmitted from the grid to meet energy demands.
Grid Connected Solar and Battery System collect solar power from your panels to use and store in your battery for backup use. The system connects to the grid, which brings the advantage of net metering. Net metering is a solar incentive that allows you to store energy in the electric grid. The excess power your solar panels generate is sent to the grid, which is exchanged for the option of grid electricity if your system is under-producing like during nighttime.
Off the Grid Solar System is entirely self-sufficient and has no way to use the grid to supply the household with electricity. Off-grid systems are not joined to any utility power lines. Batteries store the unused solar energy for nighttime use.
Sources: Energy Sage