What is the difference between a Grid-tied and a Grid-tied system with batteries?
A Grid-tied photovoltaic system produces solar electricity during the day and spins your utility meter backwards for you to use free electricity during the night. A Grid-tied Photovoltaic system with batteries provides the same benefits as the system without batteries but, this system will provide limited electricity if the grid fails. The usual protected circuits are refrigerator, telephone, alarm and entertainment circuits. The system provides enough electrical power to provide emergency lighting and minimal comforts during prolonged electrical outages.
