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Micro Solar Dome

Many households in rural areas and urban slums in India (as in many other developing countries) have neither electricity connection nor do they have proper access to sunlight within their rooms during daytime. These households use kerosene lamp or electric lamp by borrowing electricity from local shops or from diesel generator operators. Absence of sunlight and use of kerosene lamp in homes, both result in unhealthy living conditions.

 

To eradicate the darkness in these households, an innovative concept of Micro Solar Dome (Surya Jyoti)

has been developed by Kolkata based NB Institute of Rural Technology (NBIRT). The Micro Solar Dome (MSD) is a day and night lighting single device with unique features:

·         Has a transparent semi-spherical upper dome made of acrylic material which captures the sunlight and the light passes through a sun-tube having a thin layer of highly reflective coating on the inner wall of the passage.

·         Contains a lower dome made of acrylic.

·         Is fitted with a shutter in the bottom of the lower dome which can be closed, if light is not required in the daytime.

·         Is leak proof and works throughout the day and 4-5 hours after sunset depending on the season and location.

·         Is the world’s first hybrid solar lighting device, using a combination of passive and active energy.

·         Has additional feature for mobile charging in some models

 

 

Use of the micro solar dome at various times of the day helps to optimise radiation, temperature and illumination.  Following the demonstration of the efficacy and reliable working pattern of the MSD, Department of Science & Technology, Govt of India supported the concept and entrusted NBIRT to install Surya Jyoti in different metro cities as well as in remote rural and tribal belts. NBIRT has initially installed 1000 such devices in urban slums on experimental basis.

 

MSD is now being field tested in different agro-climatic conditions under a network project involving S&T based Core Support Groups working with Science for Equity, Empowerment & Development (SEED) Division of Dept of Science & Technology, GoI.

 

Technical Specifications of Micro Solar Dome

Item

Rating

PV Module O/P Power

2 X 3 Watt

PV Module O/P Voltage

10Volt Voc, 8Volts Vmp

PV Module Rated Current

375 miliAmpere

Battery Type

Li-Ion

Battery Capacity

2 X 4000 miliAmperehour

Battery Voltage

 7.4Volt ( 2nos 3.7Volt connected in series)

Luminary Type

3Watt LED

Circuit used

Electronic Driver Circuit

Hours of Operation

 

Daytime (hrs)

Night Time (hrs)

Total (hrs)

Summer

12

5

17 (minimum)

Winter

8

5

13(minimum)

 

TYPES OF DOME:

There are four types of Micro Solar Dome (Surya Jyoti) developed after prototype testing under field conditions and consequent product evolution:

1) Normal Micro Solar Dome: Dome type day-lighting device has a transparent semi-spherical upper dome made of acrylic material which captures the sunlight and the light passes through a sun-tube having a thin layer of highly reflective coating on the inner wall of the passage. The light output varies from 3 Watts to 15 Watts(electrical equivalent) Watt from morning to evening.

2) PV Integrated Micro Solar Dome: It is the latest version of the Micro Solar Dome. The integrated PV module fitted in the dome charges a battery during day time which in turn provides light during night time from the MSD for 4-5 hrs through LED fitted in the lower dome.

3) PV Integrated or Non-PV Filtered Micro Solar Dome: In both of these types of domes, Sun Filter has been used to reduce illumination during summer, if required

4) PV Integrated Micro Solar Dome with USB port: This version of MSD can also charge mobile phones in addition to providing day and night solar light.