Solar Street Lights

Compact Fluorescent Lamp (CFL) based Solar Street Lighting System

A stand alone solar photovoltaic street lighting system (SLS) is an outdoor lighting unit used for illuminating a street or an open area. The Solar Street Lighting System consists of solar photovoltaic (SPV) module, a luminaire, storage battery, control electronics, inter-connecting wires/cables, module mounting pole including hardware and battery box. The luminaire is based on Compact Fluorescent Lamp (CFL) which emits light when electric current passes through it. The luminaire is mounted on the pole at a suitable angle to maximize illumination on the ground. The PV module is placed at the top of the pole at an angle facing south so that it receives solar radiation throughout the day, without any shadow falling on it. A battery is placed in a box attached to the pole.

Electricity generated by the PV module charges the battery during the day time which powers the luminaire from dusk to dawn. The system lights at dusk and switches off at dawn automatically.

Broad Performance Specifications

The broad performance specifications of a CFL light source based Solar Street Light system are given below:

PV Module 74 Wp under STC
Battery Lead acid Tubular Flooded or Tubular GEL / VRLA, 12V -
75 AH @ C/10
Light source Compact Fluorescent Lamp of 11 Watt
Mounting of light Minimum 4 metre pole mounted
Electronic efficiency Minimum 85% total
Duty cycle Dusk to dawn
Inverter Quasi sine wave or sine wave type
Autonomy 3 days or Minimum 42 operating hours per permissible discharge

White LED (W-LED) based Solar Street Lights

A stand alone solar photovoltaic Street Lighting System (SLS) is an outdoor lighting unit used for illuminating a street or an open area. The Solar Street Lighting System consists of solar photovoltaic (SPV) module, a luminaire, storage battery, control electronics, inter-connecting wires/cables, module mounting pole including hardware and battery box. The luminaire is based on White Light Emitting Diode (W-LED), a solid state device which emits light when electric current passes through it. The luminaire is mounted on the pole at a suitable angle to maximize illumination on the ground. The PV module is placed at the top of the pole at an angle facing south so that it receives solar radiation throughout the day, without any shadow falling on it. A battery is placed in a box attached to the pole.

Electricity generated by the PV module charges the battery during the day time which powers the luminaire from dusk to dawn. The system lights at dusk and switches off at dawn automatically.

Broad Performance Specifications

The broad performance specifications of a W-LED based Solar Street Light system are given below:

PV Module 40 Wp under STC
Battery Lead acid Tubular Flooded or Tubular GEL / VRLA, 12V - 40 AH @ C/10
Light source White Light Emitting Diode (W-LED)
Mounting of light Minimum 4 meters pole mounted
Electronic efficiency Minimum 85% total
Duty cycle Dusk to dawn
Light Output Minimum 15 Lux when measured at the periphery of 4 meters diameter from a height of 4 meters.