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Roof Top Solar PV Power system-Technical and economical analysis
Maruntech enterprisesChennai
Objective
• Technical details• Economic benefits– Domestic customers– Commercial customers– Industrial customers
Solar energy
• Every hour the earth reflected back more sunlight than what is used by the entire population in one year.
• If we covered the Sahara Desert with the photovoltaic cells, we could cover all the energy requirements of the earth!
Global Energy situation
Uranium Natural Gas
Oil Coal
Annual Energy from the Sun
Annual Energy Demand
Equi
vale
nt S
tock
of E
nerg
y So
urce
Stand alone PV system
Source(PV array)
Inverter Load
BatteryCharge
Controller
Battery Bank
Grid SupplyIn case of
Emergency
S1 S2
S3
Working Mechanism
SOLAR
POWER
• FROM SUN
BATTERY
• CHARGING
INVERTER
• DC to AC
LOAD
• AC LOAD
DURING DAY
BATTERY
• DISCHARGING
INVERTER
• DC TO AC
LOAD
• AC LOAD
DURING DARK
Solar Power plant
Factors affecting performance
• Light Intensity• Shading• Cell Temperature• Angle of Sunlight• Improper Wiring• The immediate environment and geographic location• Nearby mountains, hills, trees, tall buildings etc may
considerably reduce the number of hours of direct sunshine that the panels receive.
PV Economics
• PV unit : Price per peak watt (Wp) ( Peak watt is the amount of power output a PV module
produces at Standard Test Conditions (STC) of a module operating temperature of 25°C in full noontime sunshine
(irradiance) of 1,000 Watts per square meter )
• A typical 1kWp System produces approximately 1600-2000 kWh energy in India
• One unit of solar power costs around Rs. 7.5-12
Comparison with Diesel and utility grid
Tamilnadu Solar Policy - brief
• Investment Subsidy of Rs.20000/kW addon to 30% investment subsidy from MNRE
• Incentive for roof top power plant– Rs. 2 per unit for first 2 years– Rs. 1 per unit for next 2 years– Rs. 0.50 per unit for subsequent 2 years– For All solar or Solar – wind hybrid power plant
• Solar Power obligations (SPO)– 6% of the consumption through solar for HT – Generate through captive power plant– Or Purchase from any third party having Solar PP
• All government and local bodies building should have roof top solar power plant
• All streetlights and water supplies installations in local bodies should be energized by solar power
• Exemption from electricity tax for 100% on electricity generated by solar power projects will be allowed for 5 years
• Exemption from demand cut to the extent of 100% of the installed capacity for all captive PV power owned industries
Parameters Data Assumption
Solar Plant capacity 1kW
Area required 11sq.m
Capital cost in INR 1,20,000 Rs. 120/Wp without battery
Subsidy from MNRE in INR 36,000 30% of the capital
Subsidy from TNGOV in INR 20,000 Rs.20000/kW
Net Investment in INR 64,000
Units generated per day 6 Assuming 6hours of sunshine
Units generated per year 1800 Assuming 300days of operation
EB cost from grid in INR 6300 Rs.3.5/unit
Rebate/year TNGOV in first 2 years 3600 Rs. 2/unit
Investment remaining after 2 years 44,200
Rebate/yearTNGOV in next 2 years 1800 Rs. 1/unit
EB cost from grid after two years 6552 Assuming 4% increase in tariff
Investment remaining after 4 years 27496
Rebate/year -TNGOV in next 2 years 900 Rs. 0.50/unit
EB cost from grid after 4 years 6814 Assuming 4% increase in tariff
Investment remaining after 6 years 12068
EB cost from grid after 6years 7087 Assuming 4% increase in tariff
Payback period 7 years 8 months
Parameters Data Assumption
Solar Plant capacity 1kW
Area required 11sq.m
Capital cost in INR 1,20,000 Rs. 120/Wp without battery
Subsidy from MNRE in INR 36,000 30% of the capital
Subsidy from TNGOV in INR 20,000 Rs.20000/kW
Net Investment in INR 64,000
Units generated per day 6 Assuming 6hours of sunshine
Units generated per year 1800 Assuming 300 days of operation
EB cost if consumed from grid in INR 12600 Rs.7/unit
Rebate/year TNGOV in first 2 years 3600 Rs. 2/unit
Investment remaining after 2 years 31,600
Rebate/year TNGOV in next 2 years 1800 Rs. 1/unit
EB cost if consumed after 2 years 13104 Assuming 4% increase in tariff
Investment remaining after 4 years 1792
Rebate/year TNGOV in next 2 years 900 Rs. 0.50/unit
Payback period 4 years 2 months
Parameters Data Assumption
Solar Plant capacity 1kW
Area required 11sq.m
Capital cost in INR 1,20,000 Rs. 120/Wp without battery
Subsidy from MNRE in INR 36,000 30% of the capital
Subsidy from TNGOV in INR 20,000 Rs.20000/kW
Net Investment in INR 64,000
Units generated per day 6 Assuming 6hours of sunshine
Units generated per year 1800 Assuming 30 days of month
DG unit cost if consumed in INR 27000 Rs.15/unit
Rebate/year TNGOV in first 2 years 3600 Rs. 2/unit
Investment remaining after 2 years 2800
Rebate/year TNGOV in next 2 years 180 Rs. 1/unit
Rebate/year TNGOV in next 2 years 90 Rs. 0.50/unit
Payback period 2 years 1 month