When sunlight strikes a PV panel, the electrons are excited withn the silicon solar cells. These electrons leave the solar panel via wires and enter your home through your circuit breaker and electric meter. This energy is used to power appliances and electronics in your home. Often, a solar system may produce more elctricity than is required. When this happens, the excess electricity is sent back to your electric company. At night, when there is no sunlight, your house is powered by the electric company. A solar system is low maintenence and has little ware; therefore, it will last for many years.