Grid-connected solar + battery
These systems comprise of panels, an inverter, a battery, and a connection to the grid. The solar photovoltaic system converts energy received from the sun into electricity. The solar energy generated from the panels is used in the daytime, with an excess stored in the battery system. During the days of low sunlight, high power usage, or at night time, the power is drawn from the tesla home battery system and then from the main grid as a last resort.
Off-grid solar + battery
The off-grid solution offers no connection to the main electricity supply. The system either uses the power coming directly from solar panels or from the battery. In this system, the battery pack is the main energy source during nighttime or during days of low sunshine. Generally, off-grid systems are more expensive and complex, with more number of solar panels, high load handling inverter capability, and large battery storage. Off-grid systems are affordable in remote places where no grid connection is available.