Solar Rooftop Power Plant Commercial Scheme

For commercial/industrial use, a solar power system is a renewable energy system which uses PV modules to convert sunlight into electricity. The electricity generated can be stored or used directly, fed back into the grid line or combined with one or more other electricity generators or other renewable energy source. Solar PV systems are a very reliable and clean source of electricity that can suit a wide range of applications.


  • Reduces your electricity bill
  • Low maintenance
  • Infinite source of power
  • High revenue return on investment
  • Adds value to your property
  • It is a silent producer of electricity
  • Safe and durable
  • During operation, it produces zero emissions of Co2

Components Of 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.


PlantSize(Kw)UnitGeneration(Per Day)UnitGeneration(Per Month)UnitGeneration(Per Year)UnitRate(INR/Unit)SavingINR(Month)SavingINR(Year)SystemCost(Inr)PayBack(Month)AreaRequired(Sq.feet)
2.310 9 277 3326 7.50 2077 24924 200
3.3 13.2 396 4752 7.50 2970 35640 300
4 46 480 57.60 7.50 3600 43200 400
5 20 600 7200 7.50 4500 54000 500
6.270 25.08 752 9024 7.50 5640 67680 600
8 32 960 11520 7.50 7200 86400 800
9 36 1080 12960 7.50 8100 97200 800
10 40 1200 14400 7.50 9000 108000 1000
25 100 3000 36000 7.50 22500 270000 2500
30 120 3600 43200 7.50 27000 324000 3000
50 200 6000 72000 7.50 45000 540000 5000


  • 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


  • 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.