<human>:  How do home solar panel systems work?
<bot>: Home solar panel systems generate electricity when sunlight hits the semiconductor material in their photovoltaic (PV) cells, creating an electric current. This DC current is then passed through an inverter, which converts it to Alternating Current (AC) electricity. This AC electricity is usable and can be used to power home appliances. The solar panels are connected to the grid so that any excess electricity generated can be sold back to the electric utility for a profit. Additionally, during times of low solar generation, electricity can be pulled from the grid to power the home.