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WHITE-LED (W-LED) BASED SOLAR HOME LIGHTING SYSTEMS

A solar home lighting system (SHS) provides a comfortable level of illumination in one or more rooms of a house. The SHS consists of a PV module, control electronics, battery, and luminaire(s). There are several SHS models featuring one, two, or four luminaires based on White Light Emitting Diode (W-LED). The system could also be used to run a small DC fan or a 12-V DC television along with the W-LED Lamps. PV module converts sunlight into electricity, which powers the luminaire(s). White Light Emitting Diode (W-LED) is a solid state device which emits light when electric current passes through it.

BROAD PERFORMANCE SPECIFICATIONS

The broad performance specifications of a W-LED light source based solar home lighting system are given below:

Module 6-40 Watt peak under STC
Battery Lead acid sealed maintenance free, tubular flooded or Gel / VRLA or NiMH or Lithium-Ion, or Lithium-Ferro Phosphate
Light Source 2.5 Watts (max.) White Light Emitting Diode (W-LED)
Light Out put Minimum 15 Lux when measured at the periphery of 2.5 meter diameter from a height of 2.5 meter. At any point within area of 2.5mtr diameter periphery the light level should not be more than three limes of the periphery value. The illumination should be uniform without Dark Bands or abrupt variations and soothing to the eyes. Higher output would be preferred.
Multiple Light Levels To take care of different lighting needs as per user’s requirement. The lamp should have multiple levels of light (at least two levels) to take care of different lighting needs during the night.
Mounting of light Wall or ceiling
Electronics Min 85 % efficiency
Average duty cycle 5 hours a day under average daily insolation of 5.5 kWh/ sq.m. on a horizontal surface.
Facility for Mobile Charging USB port for Mobile Charging. However, in case of mobile charging, the duty cycle for light to be reduced /adjusted accordingly.
Autonomy 3 days or Minimum 15 operating hours per permissible discharge. OR Minimum 6 operating hours per permissible discharge at full light level (In case of NiMH or Lithium-Ferro Phosphate)

There are six models of W-LED home lighting systems. The configuration of each model is as follows:

Model-I One White LED luminaire
PV Module 6 Wp under STC
Battery Lead acid Sealed maintenance free, 12V-7 AH @ C/20 or NiMH or Lithium-Ion of requisite capacity

Model-IA One White LED luminaire
PV Module 6 Wp under STC
Battery Lithium-Ferro Phosphate of 3X 3.2V, 1800 mAh (or requisite e.g. 12.8 x 1400mAh) capacity

Model- II Two White LED luminaire
PV Module 12 Wp under STC
Battery Lead acid Tubular flooded or Gel / VRLA, 12V - 12AH @ C/20

Model –III Two White LED luminaires and one DC fan of wattage up to 10 W
PV Module 24 Wp under STC
Battery Lead acid Tubular flooded or Gel / VRLA, 12V- 20AH @ C/20

Model –IV Four White LED luminaires
PV Module 24 Wp under STC
Battery Lead acid Tubular flooded or Gel / VRLA, 12V- 20AH @ C/20

It should have a socket to provide power for a 12V DC TV set which can be purchased separately.


Model –V Two White LED luminaires and one DC fan of wattage up to 20 W
PV Module 40 Wp under STC
Battery Lead acid Tubular flooded or Gel / VRLA, 12V- 40AH @ C/10

It should have a socket to provide power for a 12V DC TV set which can be purchased separately.