About the Committee
INTRODUCTION
Asutosh College is the first college in West Bengal and perhaps the first college in the country where solar power has been used for running laboratory works since February 2008 till date. A couple of 74 Watt panels were set up at the roof of the college with the help of West Bengal Renewable Energy Resource Development Agency (WBREDA), which is powering instruments in the Electronics and Computer laboratories.
In order to meet the requirement of uninterrupted street lighting at Asutosh College second campus, Bhasha the College authority installed solar street light. Ten poles each 5 'mtr in length were mounted with 80 Wp solar panels. The harvested solar energy is stored in SMF Battery of 75 Ah attached with each pole. The Solar LED Street Lighting System (Dusk to Dawn) Auto On/Off turns on using Battery power when natural light dims and fades in presence of natural light, thus using energy efficiently.
Asutosh college with financial assistance from Govt. of West Bengal has implemented Rooftop grid connected solar photovoltaic system on the roof of main building (92, S. P Mukherjee Road, Kolkata-26) in the year 2019. An array of 80 photovoltaic panels each capable of harvesting Maximum Power (Pmax) - 250 Wp thus an overall 2X10 kVA (maximum capacity) non-conventional energy harvesting unit has been installed. The green energy generated by the system is transferred to the grid and thus our college actively contributes to green energy generation.
THE BEGINNING
The plant started working under leadership of Sri Anshutosh Khan (Department of Physics) and Sri Bikash Pal (Department of Physics) from 2009. Currently, Dr. Surjya Sarathi Bhattacharyya, Assistant Professor in Physics is in-charge of several solar power units of college.
OBJECTIVES
- Reduce usage of conventional sources of energy and introducing non-conventional source of energy in academic practices, which can motivate student’s community for practicing the same in their day-to-day life.
- Practical applicability of non-conventional sources of energy been proposed for long and it remained a bookish subject for years. Thus, it was necessary for premier academic institution like Asutosh College, Kolkata to test them in practical circumstances such as instrument based laboratories viz. Electronics, Physics etc.
- The problems raised by interruptions in electric supply at district areas can be fulfilled by taking initiative, such as introducing photosensitive solar streetlight, which turns on at dusk and turns off at dawn. Thus, it serves the purposes of uninterrupted street lighting and saves power.
- Roof top grid connected solar photovoltaic system for harvesting green energy.
UTILITY IN LABORATORY
It is convenient as most of electronic equipment’s require only 12V DC. However, conventionally 440V AC is supplied by local electric supply agency namely, CESC. Thus we need to step down the input and to convert AC to 12V DC in order to fulfil laboratory requirements. But the converters have a tendency to develop defects and we have incurred huge expenses in past. Hence, the solar energy became a more convenient alternative for our purposes. Empowered by solar energy, said laboratories while running experiments remains unaffected by power cut for supply problems.
INSTRUMENTS OPERATED AT A TIME USING THIS SOLAR POWER IN THE LABORATORY
- Cathode Ray Oscilloscope (CRO).
- Function Generator.
- RMS AC Milli Voltmeter
- DC Power Supply (0-12V).
- Milli& Micro Ammeter.
- LCR (Q) Meter.
- Tube light & CFL light.
SOLAR BATTERY SPECIFICATION IN LABORATORY
- Battery Specification: Solar Tubular Battery of 12V, 120Ah.
- Inverter.
SOLARSTREETLIGHT SPECIFICATIONS
ABOUT SOLAR STREET LIGHT
A solar lamp is a fixture composed of LED Luminary, solar panel, and a rechargeable battery. Outdoor lamps may have a lamp, solar panel and battery integrated in one unit.
EXECUTIVE SUMMARY
Solar LED Street Light is a tall pole with lighting attached to the top pointing towards the ground, usually but not always used to light a highway or recreational field. The lighting is mounted on is generally at least 5 meters tall (under this height it is referred to as conventional lighting system), while the lighting consists of a luminary on the pole with one or several independent lighting fixtures mounted around it.
System at a Glance
- PV Array capacity - 1No. 80 Wp.
- Solar LED Street Lighting System (Dusk to Dawn) Auto On/Off.
- Street Light (HOT DIP GI) Pole 5 'mtr.
- SMF Battery of 75 Ah with Hazardous and Maintenance Free.
SOLAR PV SYSTEM DESCRIPTION
The PV system configuration is a standalone System with Battery Backup, which consists of the following:
- SOLAR PV MODULES - 80 Wp capacity of Si crystalline PV module of 12V.
- STREET LUMINARY (LED) - 1 no of 18 watt with AL- DIA cast metal Cabinet, Having DUSK to Down Control facility.
- MECHANICAL STRUCTURE AND HARDWARE FOR MODULE MOUNTING - Solar Street Light Pole, with (HOT DIP GI) anti dust and anti rust coating.
- WIRE, CABLE, LUGS &TERMINALS - As required for 1 set.
- EARTHEN- 1 Set.
- BATTERY BANK - Battery bank two days Backup with sealed and maintenance free having capacity 12v, 75 AH.
SOLAR PV MODULES
Solar PV modules (IEC 61215 Certified) are framed and hermetically sealed assembly of 36 solar cells connected in series. It converts the sunlight into electricity. The shape and size of the modules is approximately 1950mm x 950mm. For this project, 10 nos. (12V/80Wp each) of poly crystalline solar modules are considered.
CABLES AND CONNECTORS
Cables chosen for this solar project, PVC insulated of ISI make, and have excellent quality and characteristics to provide for a long service life. All the cables, lugs and terminals are made of best quality.
MODULE MOUNTING STRUCTURE (MMS)
The Module mounting structure is made up ofGI POLE with anti rust & Dust coating.
CABLES AND CONNECTORS
Cables chosen for this solar project, PVC insulated of ISI make, and have excellent quality and characteristics to provide for a long service life. All the cables, lugs and terminals are made of best quality.
EARTHING& OVER VOLTAGE PROTECTION
Earthing for Module mounting structure andcontrol panel for safe handling as per MNRE standard.
Operation of the Street light is totally automatic innature and does not require any attention as long as the systems are in operation.For maintenance, technician's visit the site once in six months for routinecheck-up of the system and also to top up the battery with distilled water. Regular cleaning of themodules is carried out regularly by college authority,which ensures rated power output.
OPERATION AND MAINTENANCE
Operation of the Street light is totally automatic innature and does not require any attention as long as the systems are in operation.For maintenance, technician's visit the site once in six months for routinecheck-up of the system and also to top up the battery with distilled water. Regular cleaning of themodules is carried out regularly by college authority,which ensures rated power output.
Features Solar LED Street Lighting System (Dusk to Dawn)
- High power Osaram LED street light luminary with DDC-1 No.
- 2 days power Backup for Non sunny days.
- Charging and Battery low indicators-to indicate the battery status
- Weather proof outdoor Aluminium sheet metal cast.
- Two step MPPT/PWM charge controller protects from over and deep discharging.
- Low maintenance Gel Battery.
- Galvanized Street pole and Battery Box.
Technical Specifications
| Sl. no | Technical Detail | Specification |
|---|---|---|
| 1. | Power Consumption | 20 Watt |
| 2. | Voltage In | 10.5 V – 14.5 V |
| 3. | Power Factor | >0.90 |
| 4. | CRI | >80 |
| 5. | LED Source | NICHIA / LEMWS593020 |
| 6. | Lumens | >= 1800 – 2000 Lm |
| 7. | Lux@3m Mounting Height | lux > = 600 |
| 8. | IP Protection | IP65 |
| 9. | Housing | Aluminium Sheet |
| 10. | Driver | Internal |
| 11. | LED Type | HIGH POWER SMD LEDs |
| 12. | Warranty on LED | 4 Years |
| 13. | Optics | Milky White Diffuser. LED not visible. |
| 14. | Luminaire Efficacy | > = 95 -105 lm/watt |
| 15. | Color Temp | >=6500K |
| 16. | Life of LED | 50,000 hours |
| 17. | Surge Protection | Available |
| 18. | Overvoltage Protection | Yes |
| 19. | Working Temperature | -10oC to+ 50o C |
ROOF TOP GRID CONNECTED SOLAR PHOTOVOLTIC SYSTEM SPECIFICATIONS
Asutosh college with financial assistance from Govt. of West Bengal has implemented Roof top grid connected solar photovoltaic system at the roof of main building. An array of 80 photovoltaic panels each capable of harvesting Maximum Power (Pmax) - 250 Wp thus an overall 2X1 0 kWp (maximum capacity) non-conventional energy harvesting unit has been installed. The green energy generated by the system is transferred to the grid and thus our college actively contributes in green energy generation.
ROOF TOP GRID CONNECTED SOLAR PHOTOVOLTIC SYSTEM
INVENTORY OF SPARES AT PROJECT SITE
LOA No.- WBREDA/59(2013)/NleT/-02/15-16/340, Dated 18.08.2016
WBREDA/59(2013)/NleT/-02/15-16/341, Dated 18.08.2016
PROJECT SUMMARY
Design & Engineering Manufacture/ Procurement, Testing, Supply, Installation and commissioning of 80 Nos Rooftop Grid Connected Solar PV Power Plants each of array capacity 20 kVA, including 5 years of Comprehensive Maintenance on turnkey Basis at the rooftop of Asutosh College Main building, address 92, S. P Mukherjee Road, Kolkata-26.
System at a Glance
| Sl. No | Item | Make | Unit | Qty. |
|---|---|---|---|---|
| 1 | Poly crystalline Solar PV Module of 250 Wp having 60 cells | Sunshine | Nos. | 80 |
| 2 | MS Structure for mounting SPV modules with Hot dip galvanized minimum 70 micron for 10kVA PV Array | Sunshine | Sets. | 02 |
| 3 | PV Array Junction Box (AJB) | Sunshine | Sets. | 02 |
| 4 | 10kVA, 415 V, 50 Hz AC Grid-Tied Inverter | ABB India Ltd. | Nos. | 02 |
| 5 | Web based On line data logger and remote Monitoring unit | ABB India Ltd. | Nos. | 02 |
| 6 | Inverter LT panel | Sunshine | Set | 02 |
| 7 | Grid Interfacing LT panel | Sunshine | Set | 02 |
| 8 | Kiosk ( for Inverter and other accessories) | Sunshine | Set | 02 |
| 9 | 3Ø, 4 wire, 415 V AC 3X (20A-100A) whole current Export Import energy meter | SECURE | No. | 02 |
| 10 | Cables and Wiring materials | POLYCAB | Lot | 02 |
| 11 | 4C X 6 Sq. mm PVC insulated Cu cable from Inverter LT panel to Point of common Coupling (Supply Mains) | MESCAB | Mtrs. | 100 |
| 12 | Equipment, Array structure Earthing as per technical specification with Chemical Gel Earthing System (4 Nos) | Reputed | Sets | 02 |
| 13 | Lighting arrangement (4ft., 40W, 230 V, 50 Hz, AC, Fluorescent Tube Light) | Sets | 04 | |
| 14 | PV array cleaning arrangement | Sets. | 02 | |
| 15 | Fire Extinguisher | No. | 02 | |
| 16 | Spares, Tools and Measuring Instruments | Set | 1 | |
| 17 | Signage | |||
| Project Information Signage | Nos. | 04 | ||
| Schematic Diagram | No. | 02 | ||
| Safety Signature as per site requirement | Set | 02 |
SOLAR PV SYSTEM DESCRIPTION
The PV system configuration is the following:
- Maximum Power (Pmax) - 1No. 250 Wp.
- Open Circuit Voltage (Voc) - 36.0 V
- Short Circuit Current (Isc) - 8.9 A
- Voltage at maximum power (Vmax) - 30V
- Current at maximum power (Imax) - 8.33A
- Maximum System Voltage - 1000 V
- Tolerance - +3%- 0%
(Power measured in standard test condition (STC), irradiation 1000 w/m2 , Cell temperature- 25OC, AM-1.5)