Solar Street Light
From Swikipedia
Introduction
Solar Street lighting system is an ideal lighting system for the illumination of streets, squares and cross roads located in areas that are not connected to the power grid. This fully integrated system combines the latest and most innovative technologies available providing years of convenient and trouble free lighting. Fully assembled factory tested kits are available with or without mounting poles.
Brief Description
The standalone solar photovoltaic street lighting system comprises of a Compact Fluorescent Lamp (CF Lamp) as light source, re-chargeable lead acid battery for storage, PV modules for charging the battery, suitable electronics for the operation of the tamp and safe charging and discharging of the battery and mechanical hardware for fixing these sub systems.
SSL is available either with automatic dusk to dawn operation or with a pre-set timer. It is available in 6 models depending on the wattage of the SPV Module, type and size of the battery and mode of operation.
Luminaires are also available with Low Pressure Sodium Vapour (SOX) lamps and higher wattages of compact flourescent lamps against specific customer requirements.
The SOX lamp is a monochromatic (Yellow - Orange) light source - delivering the highest possible lumens per watt. CF Lamps provide slightly less lumens per watt, but produce a white light which actually appears brighter than SOX and should be used in areas where colour rendition is critical.
The solar street light system comprises of:
• 74 Wp Solar PV Module
• 12 V, 75 Ah Tubular plate battery with battery box
• Charge Controller cum inverter (20-35 kHz)
• 11 Watt CFL Lamp with fixtures
• 4 metre mild-steel lamp post above ground level with weather proof paint and mounting hardware.
The SPV modules are reported to have a service life of 15-20 years. Tubular Batteries provided with the solar street lighting system require lower maintenance; have longer life and give better performance as compared to pasted plate batteries used earlier.
The systems electronic provide for over-charge and over-discharge cut-off essential for preventing battery and luminaries damages.
Features:
• More than 3 days of autonomy
• Automatic Dusk to Dawn Controller (DTDC) / Timer operation
• Highly efficient charge controller and Inverter
• Two step charging algorithm
• Temperature compensated set points
• Weather proof luminaries
• All necessary protection
• UV stabilised bowl and canopy
• Anodised aluminium reflectors
Benefits of using Solar Street Lights
The day to day running and maintenance costs are slashed
There is a positive environmental impact as opposed to a negative one
The lack of wiring to be installed minimizes the disruption caused to, for example, road users during installation
Power outages have no impact whatsoever on street lighting in the area
Solar street lights can be easily erected in almost all locations
For environmentally and cost conscious solutions, solar powered lighting is the ideal method to illuminate the way ahead.
References:
http://www.geda.org.in/solar/so_slr_street.htm
