As an independent system, solar street light
consists mainly of solar panels (including carriage), battery (battery box), solar controller
, lamps, poles and cables and other components.
Controller in this system mainly plays a charge and discharge control management.
In the sunny day, the electricity from solar panel is stored into the battery by the controller. At night battery to power a light source through the controller. When the rainy day is too long, panels can not generate electricity, battery to power a load at night. But when the battery capacity is less than the controller under-voltage point, the controller can disconnect the battery continue to offer power of the load directly. In the solar street light, controller just like a brain, control the normal operation of the whole system.