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Frequently Asked Questions for Grid Connected Solar Rooftop PV Power Plants

Q 1. What is a Solar Rooftop System?

A. In a solar rooftop system, the solar panels are installed on the roof of any building like residential, commercial, institutional and industrial buildings.

Q 2. How many types of Rooftop Solar PV systems are there ?

A. There are two types of Rooftop Power Plants (i) Solar Rooftop System or Off Grid Systems with storage facility using battery. (ii Grid Connected Solar Rooftop PV System.

Q 3. What is a Solar Rooftop System with Storage facility?

A. Such rooftop system has battery as storage facility. The solar electricity is stored in the battery and can be utilized during night also when the sun is not available.

Q.3. What is a Grid Connected Solar Rooftop PV System?

A. In Grid connected Solar Rooftop PV system the DC power generated from SPV panel is converted to AC power using power conditioning unit .Generated Power by this system during the day time is utilized fully for powering captive loads and excess power is fed to the Grid.Grid connected Solar Rooftop system is operational so long as grid is available. In case, where solar power is not sufficient due to cloud cover etc., the captive loads are served by drawing power from the grid.

Q 4. What are the advantages of Grid-Connected Rooftop Solar System?

A. i) Electricity generation at the consumption center and hence Savings in transmission and distribution losses ii) Low gestation time iii) No requirement of additional land iv)Improvement of tail-end grid voltages and reduction in system congestion with higher self-consumption of solar electricity v) Local employment generation.

Q 5. Is it required to install the Grid connected Rooftop Solar PV Power Plant on the Roof top of the Building?

A. It is required that Rooftop Solar Power Plant System should be located in the premises of the consumer."Premises" means rooftops or /and elevated areas on the land ,building or infrastructure or part or combination therof in respect of which a seperate meter or metering arrangements have been made by the utility for supply of electricity.

Q 5. What is the average cost of grid connected rooftop solar systems?

A. The Benchmark cost of Grid connected rooftop solar PV systems determined by MNRE is about Rs. 75 per watt or Rs. 7.5crore per MWp capacity.

Q 6. What is the size of grid connected rooftop solar system?

A. The rooftop solar systems from 1 kWp upto 1000 kWp or in combination can be set up. However as per the Rooftop Solar PV Regulations 2015 ,the maximum peak capacity of the grid connected rooftop Solar PV system to be installed shall not exceed 100 % of the sanctioned connected load/contract Demand of the consumer. Also the capacity of Solar Rooftop shall not exceed 25 % of capacity of the distribution Transformer or any other Transformer from which power is fed tothe consumer .For ex if sanctioned connected load of the building is 10 KW then maximum RooftopSolar PV Power Plant of 10 KW capacity can be installed provided the capacity of the distribution transformer to which the Solar Plant will be connected or from which power is fed to the consumer is at least 50 KV.

Q 7. How much roof area is required to set up the grid connected rooftop solar system?

A. About 10sq.m area is required to set up 1 kWp grid connected rooftop solar system. for ex installation of 5 KW system will require 50 sq.m south facing shadow free area.

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