LS Solar Asia Pvt

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



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.







Sizing PV Modules


Total Watt-Peak rating=63 KW Individual panel rating=250 Watt


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 Hour considering 10% battery loss 90389

Depth of Discharge 0.8



Battery Capacity Required(Ah-hr.) 56493 Number of battery required 57



Required current rating of the controller

(Amp.)

262



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.







Sizing PV Modules


Total Watt-Peak rating=76 W

Individual panel rating=100Watt


Battery Sizing


Total Watt Hour considering 10% battery loss 343

Depth of Discharge 0.8


Figure 5. Area Covered by street lighting system



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Autonomy Day 3

Battery Capacity Required(Ah-hr.) 92

Number of battery required 1



Required current rating of the controller(Amp.)

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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


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


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


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

LS Solar Asia Pvt

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