Estimation and Cost Analysis of Providing a 300

kW Roof Top Photovoltaic System at UBDTCE,

Davangere Premises

Anupama M N, J K Shree – BE 8th Sem,

C R Sharada Prasad, Associate Professor

Electrical and Electronics Department, University B D T College of Engineering

Davangere-577 004, Karnataka State, India

Abstract - Energy is the basic necessity of life. Growing

consumption of energy has also resulted in the world,

becoming increasingly dependent on fossil fuels such as coal,

oil and gas. The depletion of fossil fuel resources on a

worldwide basis has necessitated an urgent search for

alternative energy sources to meet up the present day

demands. Solar energy is a clean, inexhaustible and

environment-friendly potential resource among all renewable

energy options. But in the present scenario, there is a need of

continuous supply of energy, which cannot be full filled by

alone wind energy system or solar photovoltaic system due to

seasonal and periodic variations.

Therefore, in order to satisfy the load demand the

combination of solar and conventional conversion units are

now being implemented as grid connected PV systems.

Non-conventional sources such as wind, tidal are not available

in Davangere, India. Solar energy is appropriate solution for

energy demand, since solar energy is widely available here

today. We can use roof top space available in UBDTCE for

installation of solar PV system. The objective of this work is to

estimate the performance and cost analysis for 300 KW grid

connected solar photovoltaic plant and developed a system

based on the potential estimations made for a chosen area of

3000m² in UBDTCE premises. Annual energy generation by

proposed Grid connected SPV power plant is calculated,

which is also profit oriented after few years of installation.

Keywords - Non-conventional energy, solar energy, and Roof-top

grid tied PV system.

I. INTRODUCTION

Energy is the basic necessity for life. We all know energy

for providing us light and comfort. It can help us to cool

down during summers and feel warm during winters. It

also helps us to go from one place to another. There has

been an enormous increase in the global demand for energy

in recent years as a result of industrial development and

population growth. Supply of energy is, therefore, far less

than the actual demand.

The energy crisis of this new century needs

charge, attention, and a change that will keep the country

running on more than just fumes. Renewable energy has

huge potential to provide solution to increase energy crisis

and it is the key factor to the future of energy, food and

economic security.

As alternative energy sources go, solar power is

the considered one of the best. It is certainly renewable—

the sun is always shining in some part of the world. It can’t

run out and is available to all. Solar power can provide

enough electrical power to meet the needs of industries,

homes and entire towns. In one hour, enough of the sun’s

energy reaches Earth to meet the energy needs of every

human being on the planet for a whole year. Basically, it

can replace all the oil, gas, and electricity used in one year.

ADVANTAGES OF SOLAR ENERGY

After the initial cost of manufacture and installation it is

free to run (in some applications) and produces zero

pollution. Here are some good reasons for using solar

energy to power your home.

1. Cut-down electricity bill

The key reason that most households convert their power

source to solar energy is to cut down their electrical bill

because the electrical usage generated from the sun is free.

2. It is a renewable energy source

Typical electricity is generated from fossil fuel that will run

out one day. Solar energy is a good alternative to replace

fossil fuel as the major energy source because solar power

is renewable at absolutely no cost to supply energy

infinitely.

3. Environment friendly

The world pollution is getting worse. Any effort that can

reduce the pollution to the environment helps to save the

earth. Solar panels are able to harness the energy from the

sun and convert it to electricity. Therefore, the use of solar

panels is environment friendly.

4. Low / no maintenance needed

Once you have installed the solar power system, it can last

twenty to thirty years without major maintenance needed.

You may need to do system check once a year. Since it

requires very minimum maintenance cost, your cost should

be minimal.

II. LITERATURE REVIEW

This literature review explores the dominant themes related

to a Si:H thin film PV module production. The works in the

field of a Si:H production and its performance after light

soaking are studied which help in the better understanding

of work to be carried out.

EIGHT NATIONAL MISSIONS FORM THE CORE OF

THE NATIONAL ACTION PLAN, RUNNING

THROUGH 2017:

1. National Solar Mission – Renamed Jawaharlal

Nehru National Solar Mission (JNNSM)

2. National Mission for Enhanced Energy Efficiency

3. National Mission on Sustainable Habitat

4. National Water Mission

5. National Mission for Sustaining the Himalayan

Ecosystem

6. National Mission for a Green India

7. National Mission for Sustainable Agriculture

8. National Mission on Strategic Knowledge for

Climate Change

III. PROPOSED ROOF-TOP PV SYSTEM

In this paper we are proposing an innovative design of a

grid-tied PV system without storage device. Grid-tied PV

system is designed for the roof top space available in

University B D T College of Engineering premises, results

on faults and failures are listed according to the project

phases:

Planning

Installation Capacity analysis

Operation

Cost analysis

Payback period

This system is capable to feed solar energy to the utility

power grid, when grid power is available and backup the

on-site load as well when the grid power is unavailable.

The roof top grid-tied PV system is planned for the

building under construction in UBDTCE premises

considering the building plan. A typical grid-connected PV

system comprises the following components:

Solar PV Modules: Theses convert sunlight

directly into electricity (DC).

Inverter: These convert the DC current generated

by the solar PV modules to AC current for the on-

site load and utility grid.

Isolator switch: To connect and disconnect the

system when necessary and to provide protection.

Utility grid: To export and import the power

through plant.

The grid-connected PV systems have capacities ranging

from the higher Kilowatts to the Megawatt range.

IV. INSTALLED CAPACITY

The rooftop area available in the building plan of UBDTCE

premises is around 3319m2, which can be utilized for

electricity generation using grid-tied PV system

technology.

As per the analysis 10m2 area can generate 1KW power,

Therefore 3000m2 roof-top space available can generate

300KW power.

The installation capacity of the proposed system is

estimated to be 300KW. The system comprises of the

following components:

Solar PV module – 1200 numbers each rated of

250W, Vikram solar, Tilt angle: 15o, South faced.

Inverter – String inverters: 3 numbers, each rated to

be 100KW, ABB solar.

Isolator Switches and Circuit Breakers.

V. METHODOLOGY

The total annual consumption of the college is

approximately estimated to be 264960 units (from the

previous electricity bills), and the system installed is

estimated to generate 492750 units per annum. So after

utilizing the generated units, 227790 units per annum

(approximately) can be exported to the utility grid.

Total units generated=300*365days*4.5hrs/day

=492750units

Cost analysis:

Investment:

Each panel – (45-50) – 47Rs per watt (Market price)

Inverter - 15-16Rs per watt

Mounting cost of the panel – 5Rs per watt

Balanced system cost – 8Rs per watt

Others (Miscellaneous) – 5Rs

Total cost/watt=80Rs/watt

Total investment required=Cost/Watt*Total plant capacity

=80*300 KW

=24000000Rs

The initial investment of the system is estimated to be

Rupees 2,40,00,000.

Payback calculation:

Total annual consumption in UBDTCE (as per previous

electricity bills) = 264960units

Export units= generated units-consumption units

=492750-264960

=227790units

1 unit cost: Import – 5.4Rs

Export – 9.5Rs( Karnataka Tariff Order, MNRE)

Considering the savings from the captive consumption,

depreciation tax benefit for the first year(33% of 80% of

initial investment and the profit from export units the

payback period is estimated to be 6 years.

Note: 2% escalation in tariff of the consumption units,

0.5% degradation in captive consumption units and 9.5

Rupees per unit for the export units is considered in the

cost analysis.

VI. CONCLUSION

The design described is based on the potential measured.

System sizing and specifications are provided based on the

design made. Finally, cost analysis is carried out for the

proposed design. Total Estimated PV System Cost is

Rs24000000 and the payback period is estimated to be

around 6 years. The methodology adopted seems

satisfactory for determining the possible plant capacity for

an arbitrarily chosen area.

VII. REFERENCES

1. Prasanna Kumar, Aileron Trading India Pvt. Ltd.

2. International Journal of Modern Engineering

Research (IJMER), www.ijmer.com Vol.2, Issue.6,

Nov-Dec. 2012; pp-4292-4294; ISSN: 2249-6645.

3. International Journal of Current Engineering and

Technology, E-ISSN 2277 – 4106, P-ISSN 2347 -

5161 ©2014 INPRESSCO®, Available at

http://inpressco.com/category/ijcet.

4. MIT International Journal of Electrical and

Instrumentation Engineering, Vol. 3, No. 2, August

2013, pp. 72–75.

5. Karnataka_Tariff_Order-2014_2018, Issued by

MNRE.