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A standalone solar photovoltaic street lighting system is an outdoor lighting unit used for illuminating a street or an open area. Recent advances in LED lighting have brought very promising opportunities for application in street lighting. Combining LED’s low power, high illumination characteristics with current photovoltaic (PV) technology, PV powered street light utilizing LED has become a norm in many places. In today’s application, most of the common High Intensity Discharge (HID) lamps, often High Pressure Sodium (HPS) lamps are being replaced by more low powered Light Emitting Diode (LED) lamps.
A basic solar powered LED street light system components are :
The Solar Panel will provide electricity to charge the battery during day time. The battery’s charging is controlled by a charge controller. The operation of the LED bulb is controlled by a control circuit either by using sensors such as Light Dependent Resistor (LDR) or voltage or current sensor. All these components will be fixed on a pole as shown in Figure 1 below. The solar panel is mounted at the top of the pole to minimize the possibility of any shading on the panels.
Defining of packages :The packages have been defined based on the power consumption of lamps. The package will be selected based on the nature and size of the road for which the solar street light system is being designed.
SSLS Type | Lamp Size (Watt) | Minimum Solar PV Module Size (Wp) | Minimum Battery Size for Lead Acid(AH) | Height of pole in meter | Charge Controller | Wiring | Installation |
---|---|---|---|---|---|---|---|
Type 1 | 6 | 30 | 40 | 5 | In built Charge Controller with LDR |
4mm x 10Mts | As per MNRE Guideline |
Type 2 | 9 | 40 | 40 | 5 | |||
Type 3 | 12 | 50 | 60 | 6 | |||
Type 4 | 15 | 60 | 60 | 6 | |||
Type 5 | 18 | 75 | 75 | 6 | |||
Type 6 | 24 | 100 | 100 | 7 | 12V / 10Amr Charge Controller |
6mm x 10Mts | |
Type 7 | 30 | 120 | 120 | 7 |