A typical make up of a solar system is solar panels and an inverter. The job of the inverter is to convert direct current (DC) made from the solar panels to alternating current (AC) which is the current used in homes. The three most common systems are grid-connected, grid-connected with battery backup, and off-grid.
This system keeps your home connected to your local utility’s and your solar system compliments the power supply from your utility company. Since your system is connected to the utility, an interconnection agreement is needed with your utility to ensure the safety of their workers as well as yourself. North Carolina Utilities Commission (NCUC) established a standard interconnection agreement.
Grid-Connect with Battery Back-up
Just like the grid-connected system, the system is connected to the grid, but this system has a battery to store electricity generated from the solar system. The electric stored in the batteries can be used during power outages to power your home. The battery gathers power generated by your PV system and sends it to a breaker box, into the home’s electric system.
These systems are not tied to the utility’s electric grid and are mostly found in remote areas. The system is the home’s main source of energy. Batteries store unused electricity and use it at night when no energy is being produced.