Solar Rooftop Power Plant Residential Scheme

For residential schemes, the government of India has planned to scale up development of grid - connected solar power under the national solar mission. All state governments have declared schemes to promote the use of solar energy by installation of solar PV systems on rooftop individual residences. Installation of rooftop solar panels require no land and energy is consumed where it is generated; where there would be no element of transmission loss or wheeling loss. Therefore, such plants would be in the interest of household savings as well as betterment of state utilities.

Advantages

  • Solar Energy is clean and pollution free.
  • It is in harmony with nature.
  • Solar power is available in abundance and at your doorstep.
  • Photovoltaic system is very easy to install, operate and maintain.
  • As there are no moving parts in rooftop systems, the system is very robust ensuring a long life of about 25 years.

Components Of A Solar Rooftop System

Solar Panel
Solar Panel is an assembly of a number of photovoltaic cells and it is used as a component of a rooftop system to generate and supply DC electricity.
Solar Array
Multiple solar panels connected together form a solar array.
Junction Box
An electrical junction box is a container for electrical connections, usually intended to conceal them from sight and tempering. It also includes terminals for joining cables; its protection degree should be ip65.
Inverter (Grid Connected Power Conditioning Unit)
The power conditioning unit (PCU) used in grid connected SPV systems consist of an inverter and other electronics for MPPT, synchronisation and remote monitoring. The inverter is the most complicated part of the PV system. It has to act as an interface between the PV array and the grid. It needs to trip if the frequency of voltage or current goes outside acceptable ranges.
Net Metering Systems
In case of rooftop solar PV systems, the type of metering system is net metering where the focus is on consumption within the owner's rooftop installation (with the grid acting as an energy bank); in such a case the existing utility meter is to be replaced with a bi-directional or import-export meter.

*Rates are as per PGVCL 2020-21 roof-top subsidy scheme and subject to change as per change in specifications/guidelines.

DC capacity in kW 1.001.982.973.964.955.285.947.929.90
Number of modules (330W) (250W x 4) 6 9 12 15 16 18 24 30
Watt capacity 1000 1980 2970 3960 4950 5280 5940 7920 9900
Price / kW 46,827.00 42,993.70 41,991.80 40,993.20 40,993.20 40,993.20 40,993.20 40,993.20 40,993.20
Total price (A) 46,827.00 85,127.53 1,24,715.65 1,62,333.07 2,02,916.34 2,16,444.10 2,43,499.61 3,24,666.14 4,05,832.68
40% subsidy (B) 18,730.80 34,051.01 49,886.26 49,191.84 49,191.84 49,191.84 49,191.84 49,191.84 49,191.84
20% subsidy (C) - - - 7,870.69 15,987.35 18,692.90 24,104.00 40,337.31 56,570.62
Total subsidy (D=B+C ) 18,730.80 34,051.01 49,886.26 57,062.53 65,179.19 67,884.74 73,295.84 89,529.15 1,05,762.46
Beneficiary payable amount (A-D) 28,096.20 51,076.52 74,829.39 1,05,270.54 1,37,737.15 1,48,559.36 1,70,203.77 2,35,137.00 3,00,070.22
Rounded 28,097.00 51,077.00 74,830.00 1,05,271.00 1,37,738.00 1,48,560.00 1,70,204.00 2,35,137.00 3,00,071.00

Features

  • PV System Scheme Of Govt. of Gujarat & MNRE.
  • Allowed solar capacity: residential consumer- no limit, trust & social sector- up to 50% of sanctioned load, commercial MSME - no limit
  • Meter: bi-directional and solar generation meter.
  • Surplus generation to be paid by DISCOM at APPC (Average Power Purchase Cost of the year of the installed system).
  • Banking of Energy: per billing cycle.
  • Wheeling/Transmission charges: No charges
  • Renewable purchase obligation (RPO): credited to DISCOM

Information

  • A 1 kW photovoltaic system would generate an average of 3-4 units (kWh) per day. 320 days are considered sunny days in Gujarat/other states and hence a 1 kW photovoltaic system would generate around 960-1500 units of electricity per year - subject to: *(solar module cleaning twice a week regularly & 365 days availability of electricity).
  • Ministry of New and Renewable energy shall provide subsidy (CFA).
  • State government shall provide subsidy.
  • Connectivity charges of DISCOM and DISCOM agreement and net meter charges on actuals to be paid by customer.
  • If the required structure is more than 1 feet high then the customer pays extra structure cost.
  • Company provides 5 meters AC cable and 50 meters DC cable. Extra cable can be provided and shall be charged on actuals.

Electricity Generation By Solar Rooftop System

A 3.2 kW photovoltaic system would require about 320 square feet of shadow free area. Large photovoltaic systems would require proportionally more space to absorb more sunlight. Hence for example, a 5 kW system would require 500 square feet area.

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