Report of Mini project calculation Solar System in Schools

1. DEPARTMENT OF ELECTRICAL
ENGINEERING
Kaleemullah Mangi BE-VII (Power)
Report of Mini project for
Solar System in Schools
.
Renewable Energy System
CMS-ID: 033-14-0124
Submitted to:
Engr: Khawaja Haider Ali

2. Introduction:
I have purposed project for newly constructed Govt: girls school Loungani,
Shikarpur Sindh. This school newly constructed in my village.
I want to totally electrical system in this school on D.C, the supply from PV solar
cell. This school should be off grid system because in summer season in our village
there was load shedding in a day. Children face that problems so it should be better
solution for all problem solar system in school. Load of school must be in D.C
because it consume less Power and there is no need of storage devices because
school timing is in a day.
Load Estimation:
In this school total five rooms and one office for principal and faculty.
1. In every room there is 2 D.C Fan (total 12fan for 8hour) and
It’s rating 22Watts Price RS: 4150. Show in fig:1
Total D.C fans load =no of fan*fan rating in Watt*hour
=12*22*8=2112Wh
Total D.C fans load =2.112kWh

3. 2. Four LED Bulb for every room(total 24 Bulbs for 8hour) and It’s
rating 7watt price RS:300
Total LED Bulbs load =no of LED Bulb* LED Bulb rating in Watt*hour
=24*7*8=1344Wh
=1.344kWh
Total LED Bulbs load==1.344kWh
3. Motor load: One motor and it’s rating 0.75hp (559.5watt) and it run
for 3hours in a day Price Rs: 7500.
Motor Load=1.68kWh
Total load= (Total D.C fans load + Total LED Bulbs load+ Motor Load)
= 2.112+1.344+1.68=5.136kWh
Total D.C load=5.136kWh
Estimation no: of solar panel required:
Assumption:

4. PV panel power rating = 40watt peak (Wp) Operating factor=0.75.
Combined efficiency =0.81
• Actual power output of a PV panel = Peak power rating × operating factor
= 40Wwatt × 0.75 = 30 watt
• The power used at the end use is less (due to lower combined efficiency of
the system = Actual power output of a panel × combined efficiency
= 30 × 0.81 = 24.3 watts (VA) = 24.3 watts
• Energy produced by one 40 Wp panel in a day = Actual power output × 8
hours/day (peak equivalent)
= 24.3 × 8 = 194.4 watts-hour
• Number of solar panels required to satisfy given estimated daily load :
= (Total watt-hour rating (daily load)/(Daily energy produced by a panel) =
5136watts-hour/194.4 watts-hour
=26.4
Number of solar panels=27 (round fig)
Total Cost Required for this project:
Cost of D.C Fans =no of fan*cost/fan= 12*4150 =RS: 49,800.
Cost of LED Bulbs =no of LED Bulbs*cost/LED bulb=24*300= RS: 7,200.
Cost of Motor = 1*7500= Rs: 7500.
Cost of Solar Panels= No. of PV modules * Cost/Module
=27*7,000= RS: 1, 89,000
Cost for other material (wire etc.) = 5,000

5. Total Cost = (Cost of D.C Fans+ Cost of LED Bulbs+ Cost of Motor+ Cost of
Solar Panels+ Cost for other material).
= (49,800 +7,200+7500+189,000+5,000)
Total Cost = RS: 2, 51,000
Advantage:
• Reduces Electricity Bills
• Solar energy is free & clean
• Low Maintenance Costs
• Solar energy is infinite
• Solar energy does not cause pollution.
• Renewable clean power that is available every day of the year, even cloudy days
produce some power
• No Load shedding
• Independent from distribution company
Disadvantages:
• High initial costs for material and installation.
• Needs lots of space as efficiency is not 100% yet
• Lower production in the winter months
• Weather Dependent
• Solar power stations do not match the power output of similar sized conventional
power stations