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8/10/2019 LS Solar Asia Pvt
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KATHMANDU UNIVERSITY
School of Engineering
Department of Electrical & Electronics Engineering
INTERNSHIP REPORT
LS SOLAR ASIA PRIVATE LIMITED
Submitted By:
Ravi Raj Shrestha (42047)
September, 2014
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TABLE OF CONTENTSACKNOWLEDGEMENT ............................................................................................................... i
ABSTRACT .................................................................................................................................... ii
LIST OF FIGURES ....................................................................................................................... iii
LIST OF ABBREVATIONS ......................................................................................................... iv
CHAPTER 1: OVERVIEW OF THE ORGANIZATION.............................................................. 1
1.1 Introduction ........................................................................................................................... 1
1.2 Vision .................................................................................................................................... 1
1.3 Mission .................................................................................................................................. 1
1.4 Objectives .............................................................................................................................. 1
1.5 Markets .................................................................................................................................. 11.6 Organizational Structure ....................................................................................................... 2
1.7 Products ................................................................................................................................. 2
1.8 Services ................................................................................................................................. 3
1.9 Collaborations and Competitors ............................................................................................ 3
CHAPTER 2: INTERNSHIP DETAILS ........................................................................................ 4
2.1 System sizing for solar power as main and backup supply ................................................... 4
2.1.1 Site One: Dental Building and Skill Lab ........................................................................ 4
2.1.2 Site Two: Main Building ................................................................................................ 6
2.2 System sizing for street lighting ............................................................................................ 8
2.3 Calculation of efficiency of LED light and its driver............................................................ 9
2.4 Limitations and problems encountered ............................................................................... 11
CHAPTER 3: CONCLUSION AND RECOMMENDATIONS .................................................. 12
APPENDIX ................................................................................................................................... 13
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ACKNOWLEDGEMENT
I would like to express my gratitude to all those who gave me the possibility to complete this
internship.I want to thank the Department of Electrical and Electronics Engineering of
Kathmandu University for giving me this wonderful learning platform.
I am grateful to internship supervisor Mr. Dipesh Shrestha for his kind support and supervision
throughout the internship work .I express my deep sense of admiration to Mr. Bibek Shrestha for
his encouragement and valuable suggestions.
I would also like to thank my dear colleagues for their constant help and support.
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LIST OF FIGURES
Figure1. Organizational Structure of Company ........................................................................................... 2
Figure 2. Site one top view ........................................................................................................................... 4
Figure 3. Top view of site two ...................................................................................................................... 6
Figure 4. Model of system at site one and site two ....................................................................................... 7
Figure 5. Area Covered by street lighting system ......................................................................................... 8
Figure 6. Model of street lighting system ..................................................................................................... 9
Figure 7. Metal frames for the structure ..................................................................................................... 13
Figure 8. Workers at the project site ........................................................................................................... 13
Figure 9. Metallic structure for holding the panels ..................................................................................... 13
Figure 10. Solar panels installed at site two ................................................................................................ 14
Figure 11. Street light at Dhulikhel Hospital premesis ............................................................................... 14
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LIST OF ABBREVATIONS
ISO International Organization for Standardization
IEC International Electrotechnical Commission
CE European Conformity
UL Underwriters Laboratories
WLED White light emitting diode
PV Photo-voltaic
KW Kilo-Watt
RnD Research and Development
W Watt
Whr Watt-hour
A Ampere
Ahr Ampere-hourV Volt
KVA Kilo Volt-Ampere
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CHAPTER 1
OVERVIEW OF THE ORGANIZATION
1.1 Introduction
LS Solar Asia Pvt. Ltd. is reliable and established company, specialized in providing products,
systems and services in the renewable energy sector. LS Solar Asia Pvt. Ltd. has been working in
manufacturing, assembling and system integration of solar power system and representing
various multinational companies in worldwide as their master distributor and dealers and has
diversified into many solar application projects system integration internationally. With the
current worldwide expansion of interest and sales in renewable energy products, including our
own region, the company is well positioned with the appropriate products and experience to play
an important role. LS Solar Asia Pvt. Ltd. has a total involvement and commitment towards
increasing the use of renewable energy in helping to solve the world’s energy need.
1.2 Vision
Contributing to the world’s green energy development and alleviating world’s energy crisis.
1.3
Mission
To focus on our customers’ market challenges and needs by providing excellent solar modules
and PV power generation solutions in order to consistently create maximum value for customers.
1.4 Objectives
Deliver high quality services to customer in line with their expectation to derive
optimum benefit from the price they pay.
Develop and widen service areas introducing innovative service packages through
maintaining report and long term relationships with key partners including exchangeof knowledge and technology.
1.4
Markets
The company primarily distributes products throughout the world through its extensive
distributor network. The company is total solution provider for solar power,
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telecommunication equipment, water pumps for drinking and irrigating, street lights, Off-
Grid, On-Grid System hybrid system and On-Grid application.
1.6 Organizational StructureCompany organizational chart consists of board of directors supported by well-qualified and
experienced core staffs comprising of technical specialists. In addiction it comprises of
hardworking and intelligent members that have sound business ideas that constantly drives the
organization in the path of attaining its mission and vision.
Figure1. Organizational Structure of Company
1.7 Products
Silicon Wafers
Solar Cells
Solar Modules
Inverters
Charge Controllers
Batteries
Solar LED lights
Board ofDirectors
ChiefExecutive
Officer
Engineering Procurement InventoryManagement Administrationand Finance
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1.8 Services
Solar Engineers and Technicians are Trained and Licensed in the service and repair of most
manufacturers Solar Panels and Inverters. They can diagnose and repair all problems. Company
guarantees its work with 100% customer satisfaction. With over 12 years’ experience and more
than 1,500 clients, their reputation speaks for itself.
1.9 Collaborations and Competitors
LS Solar Asia has global outlets in countries like India, Maldives, and SriLanka and Bangladesh.
It has acquired certificates from ISO 9000, ISO 14000, IEC 61215, CE, UL and TUV. It deals
with brands like Apollo Solar, Outback Power System, Morningstar Corporation, Everexceed
Solar Corporation etc.
As this company deals with renewable energy, some of its competitors in the market are Gham
Power Nepal, Suryodaya Urja Pvt.Ltd, Lotus Energy Pvt.Ltd etc.
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CHAPTER 2
INTERNSHIP DETAILS
Dhulikhel Hospital has received a grant from Government of Nepal for the implementation of
Dhulikhel Hospital Solar Power Project in the Hospital. The Project is an initiative of the
Hospital towards clean energy. Under the supervision of Mr. Dipesh Shrestha I was involved in
this project as an intern. Dhulikhel Hospital Solar Power Project has been divided into two
different parts. Firstly solar power as main and backup supply for two different blocks of the
hospital and secondly outdoor lighting or street lighting powered by solar energy covering the
whole hospital premises.
During my internship, I was mainly involved in observation of the activities carried out at the
project site i.e. Dhulikhel Hospital. However my activities can be listed as follows:
Detail analysis of system sizing of Dhulikhel Hospital solar power installation.
Supervise the delivery of solar panels and batteries at the project site.
Detail analysis of street lighting system at Dhulikhel Hospital premises.
Observation of installation of poles, solar panels, battery, charge controller and LED light
for street lighting purpose.
Determining the efficiency of LED light and its driver from a local company.
Observation and supervision of installation of structure for holding the solar panels at the
main building.
2.1 System sizing for solar power as main and backup supply
There are two sites for solar power installation. Site 1 is the Dental Building and Skill Lab
whereas site two is the main building comprising different wards.
2.1.1 Site One: Dental Building and Skill Lab
Figure 2. Site one top view
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Dental Building and Skill Lab has been chosen because around 90% of its load is daytime load
which reduces the usage of battery in the system until the system is grid tied in near future. Other
reason is the availability of vacant rooftop with minimum obstacle for sunlight.
As per the energy audit performed the load profile is summarized below:
Total Wattage Connected at a time 9350
Highest Load in Watt 3640
Total Watt-hour per day 395340
Load Correction Factor 0.15
Corrected Watt-hours per day 454641
Sizing PV Modules
Effective sun hours per day at the location=4.5
Total Watt-Peak rating=101.03 KW
Individual panel rating=250 Watt
Total Number of Panels=404
Battery Sizing
100KWhr of the total energy consumption has been considered requiring the battery backup andremaining to be operated utilizing direct power from sun.
Total Watt Hours used per day 100000
Total Watt Hour considering 10% battery loss 110000Depth of Discharge 0.8
Nominal Battery Voltage 2
Battery Ampere hour rating 1000
Battery Capacity Required(Ah-hr.) 68750
Number of battery required 69
Solar Charge Controller Sizing
Operating voltage of the system 240
Required current rating of the controller(Amp.)
415
Individual controller current rating (Amp.) 215
Number of controller 2
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Inverter Sizing
Inverter Operating Voltage 240 V dcInverter size KVA 120
2.1.2 Site Two: Main Building
Different wards of the main building like medical, surgical, orthopedics and emergency ward
lighting load and some critical load is to be powered by the solar power. This building is chosen
considering the sensitivity of artificial light requirements at the wards.
As per the energy audit performed the load profile is summarized below:
Total Wattage Connected at a time 20543
Highest Load in Watt 3500
Total Watt-hour per day 246521
Load Correction Factor 0.15
Corrected Watt-hours per day 283500
Sizing PV Modules
Effective sun hours per day at the location=4.5
Total Watt-Peak rating=63 KW Individual panel rating=250 Watt
Total Number of Panels=252
Battery Sizing
Battery has been considered for 50% of the load operating for 8 hours per day.
Figure 3. Top view of site two
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Total Watt Hours used per day 82172
Total Watt Hour considering 10% battery loss 90389
Depth of Discharge 0.8
Nominal Battery Voltage 2
Battery Ampere hour rating 1000
Battery Capacity Required(Ah-hr.) 56493 Number of battery required 57
Solar Charge Controller Sizing
Operating voltage of the system 240
Required current rating of the controller
(Amp.)
262
Individual controller current rating (Amp.) 140
Number of controller 2
Inverter Sizing
Inverter Operating Voltage 240 V dcInverter size KVA 75
Both site one and site two are hybrid system primarily using solar power as main source and
during unavailability of sun or technical difficulties as backup power source. This system will be
equipped with data logging and remote monitoring unit.
Figure 4. Model of system at site one and site two
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2.2 System sizing for street lighting
The pole mounted outdoor lighting door system consists of 30 Watt LED light as the main load.
It is to operate full load for full load for eight hours and half load for two hours.
As per the energy audit performed the load profile is summarized below:
Total Wattage Connected at a time 30
Highest Load in Watt 30
Total Watt-hour per day 270
Load Correction Factor 0.15
Corrected Watt-hours per day 311
Sizing PV Modules
Effective sun hours per day at the location=4.5
Total Watt-Peak rating=76 W
Individual panel rating=100Watt
Total Number of Panels=1
Battery Sizing
Total Watt Hours used per day 311
Total Watt Hour considering 10% battery loss 343
Depth of Discharge 0.8
Nominal Battery Voltage 12
Figure 5. Area Covered by street lighting system
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Battery Ampere hour rating 100
Autonomy Day 3
Battery Capacity Required(Ah-hr.) 92
Number of battery required 1
Solar Charge Controller Sizing
Operating voltage of the system 12
Required current rating of the controller(Amp.)
6
Individual controller current rating (Amp.) 10
Number of controller 1
This system is completely powered by solar energy with no other source of energy. The system
is autonomous .For places where placement of solar panels is difficult centralizes system will be
used.
2.3 Calculation of efficiency of LED light and its driver
During my internship I was involved in determining the efficiency of LED light and its driver
from a local company. Samples contained LED light of wattage 3W, 5W, 7W and 9W.Followingtable shows the calculation of performance efficiency of LED driver for different lights.
3W LED Bulb
Supply Voltage (V) Voltage across driver (V) Current Drawn (mA) Efficiency (ɳ %)
150 6 338 67.6
Figure 6. Model of street lighting system
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5W LED Bulb
Supply Voltage (V) Voltage across driver (V) Current Drawn (mA) Efficiency (ɳ %)
150 11 290 63.8
175 11 322 70.84
200 11.2 365 81.76
225 11.4 371 84.36
250 11.4 383 87.3
7W LED Bulb
Supply Voltage (V) Voltage across driver (V) Current Drawn (mA) Efficiency (ɳ %)
150 18 238 61.2
175 18.1 265 68.52
200 18.3 300 78.42
225 18.3 320 83.65
250 18.4 323 84.9
9W LED Bulb
Supply Voltage (V) Voltage across driver (V) Current Drawn (mA) Efficiency (ɳ %)
150 21.8 265 64.2
175 21.9 287 69.84
200 22 322 78.7
225 22.2 344 84.3
250 22.3 352 87.2
175 6 353 70.6
200 6.1 387 78.7
225 6.2 422 87.2
250 6.2 430 88.8
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2.4 Limitations and Problems encountered
During my internship the project was at its initial stage. Initially activities at the project
site were very less. Project picked up its pace during middle stage of my internship time
frame. So main limitation was the duration of my internship.
There were few problems that crept up during my internship. Main problem was lack of
communication between personnel involved in project at management level. The delivery
of solar panels and batteries were not at the specified time. The structure made as a model
was faulty. It did not include the equal level of the base which emerged as big problem
later on.
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CHAPTER 3
CONCLUSION AND RECOMMENDATIONS
Solar Photovoltaic System has emerged with great potential in the field of renewable energy. Its
advantages like pollution free, sustainability have surpassed its shortcomings of being expensive
at installation phase. Dhulikhel Hospital’s initiative towards renewable energy is exemplary and
praiseworthy. As for internship is concerned being able to be a part of this project provided
exposure towards outer world. I was able to learn management skills along with techniques of
installing solar photovoltaic system. I got to know different standards followed in designing
street lighting system Time spent at this project was the most productive and exhilarating
experience of my learning life.
The internship was successful with the coordination of supervisor of project and the project
manager. These types of project should be held in institutions, public places, hospitals, school,
universities and priority streets. Clean energy helps the environment and society to be clean,
healthy and standard.
Credit goes to Kathmandu University for providing the opportunity for students to go for
internship. However the internship period should be determined for the convenience of all the
parties. It should be beneficial to all i.e. the organization, the university and students. In this
context the concerned authority should focus on extending the time frame of internship so that it
would add extra dimension. Last but not the least LS Solar Asia Pvt.Ltd has played a major role
in making this world place a better place to live. It has done a commendable job in the field of
renewable energy and hope it will continue its work in near future.
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APPENDIX
Few Snapshots at the project site:
Figure 7. Metal frames for the structure
Figure 8. Workers at the project site
Figure 9. Metallic structure for holding the panels
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Figure 10. Solar panels installed at site two
Figure 11. Street light at Dhulikhel Hospital premesis