The document outlines the components and calculations for a residential solar energy system, including the required number of photovoltaic panels (18) and expected daily electricity generation (17.70 kWh). It details the economic analysis, highlighting an annual electricity bill of Rs. 57,024.00 and a simple payback period of 6 years and 6 months for the system's installation cost of Rs. 1,219,600.00.

1. Abeynayake A.A.D.I- 180002H
Residential solar
energy system
1
ENERGY TECHNOLOGY AND ENVIRONMENT
ME 4242

2. 2
 Solar technology is used to catch Solar
radiation and transform it into usable
energy.
Photovoltaic panels(PV)
 Main components of the System
• PV solar panel system
• Inverter
• Monitoring panel
• Cables
• Battery
Introduction
PV module Efficiency (%)
Mono - Si 15
Poly-Si 11
a-Si 8

3. Selected best field
3
Length = 370 inches
Width = 180 inches
Roof (inches) Panel (inches) Number of panels
Length 370 39 9
Width 180 65 2
Required number of panels 18
 Required number of solar panels = 18
 Estimation of the Required number of solar
panels

4. 4
Maximum possible daily electricity generation
 According to the topological map “Udugalmote” area is in the shaded region labelled
“1534kWh”.
 Maximum possible daily electricity generation = 17.70 kWh/Day
Electricity potential topo map in Sri Lanka

5. 5
Requirements for the calculation of the
installing solar panel system
 Yearly average daily horizontal irradiation = 5.38 kWh//day
 Longitude and Latitude
- Latitude =
- Longitude =
 Plate inclination angle =
 Monthly averaged panel temperature =
 By using above data, Maximum possible electricity output
for 18 panel can be taken as 20.7

6. 6
Annual saving by installing panel system
Month Number of units
August
97
May
153
September
131
July
157
Average number of units
134.5
Monthly electricity bill = Rs.
4,752.00
Annual electricity bill = Rs.
57,024.00

7. 7
Simple payback period of cost for installing
solar panel system
Initial cost
1 Cost for panels
2 Inverter
3 Solar net meter and other components
4 Transportation and labor cost
Rs 1,219,600.00
 Energy generated by panels per month = 20.7 *30 = 621 kWh
 Annual energy generated and exported to the grid = (621 – 135) *12 = 5,832 kWh
 Annual income from the energy exported to the grid in first 7 years = Rs. 898,128.00

8. 8
Simple payback period of cost for installing
solar panel system ctd…
Initial cost
Annual income from the energy exported to the grid in the first 7 years
Annual income from the energy exported to the grid after 7 years
Annual savings from your project during the first YY year by installing solar panels
Payback Period = 6 years 6 months.
898,128.00 + 5,832 * 15 * (YY-7) + 57,024.00 * YY = 1,219,600.00

9. 9
Used Inverter to the system
 Used to DC AC
 Types of inverters
- String inverters
- Grid tie inverter
- Micro inverters
- Power optimizers
- Hybrid inverters
Grid tie inverter is used because,
 It is shut off immediately in the event of a power
outage
 It has built-in monitor

10. 10