A stand alone solar photovoltaic street lighting system is an outdoor lighting unit used for illuminating a street or an open area. It consists of photovoltaic (PV) module(s), LED lamp , lead acid battery, control electronics, inter-connecting wires/cables, module mounting Pole including hardware and battery box. The LED is fixed inside a luminaire which is mounted on the pole. The PV module is placed at the top of the pole at an angle to maximize incident solar radiation, and a battery is placed in a box attached to the pole. The module is mounted facing south, so that it receives solar radiation throughout the day, without any shadow falling on it. Electricity generated by the PV module will charge the battery during the day time. This system operates from dusk to dawn.
TYPES OF SOLAR STREET LIGHTS
Solar street lights are generally classified into two types
Standalone solar street lights
Standalone solar street lights have pv panels mounted on the structure. Each street light has its own photovoltaic panels and is independent of the other lamps
Centrally operated solar street lights
In this type, the pv panels for a group of street lights are mounted separately. All the street lights in a particular group are connected to this central power source.