1. Roof Top Solar PV Power system -Technical and economical analysis Maruntech enterprises Chennai

2. Objective Technical details Economic benefits – Domestic customers – Commercial customers – Industrial customers

3. 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!

4. Global Energy situation UraniumNatural Gas OilCoal Annual Energy from the Sun Annual Energy Demand Equivalent Stock of Energy Source

5. Stand alone PV system Source (PV array) InverterLoad Battery Charge Controller Battery Bank Grid Supply In case of Emergency S1S2 S3

6. Working Mechanism DURING DAYDURING DARK

7. Solar Power plant

8. 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.

9. 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

10. Comparison with Diesel and utility grid

11. 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

12. 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

13. MNRE -Subsidy The release of funds for the project shall be back ended as reimbursement on completion and verification thereof. The release of funds could be front ended, with installments of 70% on sanction and 30% on completion. In respect of credit linked capital subsidy and interest subsidy the scheme would be implemented through IREDA

14. Strict adherence to the national/international standards is a must. Use of imported complete PV systems is not permitted under the scheme. However, use of imported components of a complete PV system is permitted, subject to adequate disclosure and compliance to specified quality norms and standards.

15. ParametersDataAssumption Solar Plant capacity1kW Area required11sq.m Capital cost in INR1,20,000Rs. 120/Wp without battery Subsidy from MNRE in INR36,00030% of the capital Subsidy from TNGOV in INR20,000Rs.20000/kW Net Investment in INR64,000 Units generated per day6Assuming 6hours of sunshine Units generated per year1800Assuming 300days of operation EB cost from grid in INR6300Rs.3.5/unit Rebate/year TNGOV in first 2 years3600Rs. 2/unit Investment remaining after 2 years44,200 Rebate/yearTNGOV in next 2 years1800Rs. 1/unit EB cost from grid after two years6552Assuming 4% increase in tariff Investment remaining after 4 years27496 Rebate/year -TNGOV in next 2 years900Rs. 0.50/unit EB cost from grid after 4 years6814Assuming 4% increase in tariff Investment remaining after 6 years12068 EB cost from grid after 6years7087Assuming 4% increase in tariff Payback period7 years 8 months

16. ParametersDataAssumption Solar Plant capacity1kW Area required11sq.m Capital cost in INR1,20,000Rs. 120/Wp without battery Subsidy from MNRE in INR36,00030% of the capital Subsidy from TNGOV in INR20,000Rs.20000/kW Net Investment in INR64,000 Units generated per day6Assuming 6hours of sunshine Units generated per year1800Assuming 300 days of operation EB cost if consumed from grid in INR12600Rs.7/unit Rebate/year TNGOV in first 2 years3600Rs. 2/unit Investment remaining after 2 years31,600 Rebate/year TNGOV in next 2 years1800Rs. 1/unit EB cost if consumed after 2 years13104Assuming 4% increase in tariff Investment remaining after 4 years1792 Rebate/year TNGOV in next 2 years900Rs. 0.50/unit Payback period4 years 2 months

17. ParametersDataAssumption Solar Plant capacity1kW Area required11sq.m Capital cost in INR1,20,000Rs. 120/Wp without battery Subsidy from MNRE in INR36,00030% of the capital Subsidy from TNGOV in INR20,000Rs.20000/kW Net Investment in INR64,000 Units generated per day6Assuming 6hours of sunshine Units generated per year1800Assuming 30 days of month DG unit cost if consumed in INR27000Rs.15/unit Rebate/year TNGOV in first 2 years3600Rs. 2/unit Investment remaining after 2 years2800 Rebate/year TNGOV in next 2 years180Rs. 1/unit Rebate/year TNGOV in next 2 years90Rs. 0.50/unit Payback period2 years 1 month