1. 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

2. 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.

3. 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.