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Rooftop Solar Systems

Type of Rooftop Solar Systems

Technically a Solar PV System is classified into two categories: On-grid systems connected to the main electrical supply in your building.  And Off-grid systems, off the grid (not connected to your main electrical supply) and Solar PV hybrid systems.

This can be of two types (i) Solar Rooftop System with storage facility using battery

                                            (ii) Grid Connected Solar Rooftop System.

On-grid Rooftop Solar Systems

There are two ways in which an On-grid Rootp system can be configured:

  • The entire Rooftop Solar system is connected to the main electrical supply.
  • In addition to the main electrical supply, Solar system can also be connected to other power sources like batteries.

Hybrid Solar PV System

The solar PV system combined with another power generating source is called Hybrid Solar PV system. The most commonly used hybrid system is Solar PV with DG and Grid electricity. You can also include a battery bank, which can be used when solar is not generating enough power. Solar PV hybrid system with battery backup is the most suitable option for remote locations such as rural area, mining sector and island etc. where grid supply is either poor or not available. Also, transportation of diesel to remote locations and its storage is very expensive.

Off-Grid Rooftop Solar System

Off-grid Solar system is a battery-backed system and does not need to be connected to your electrical supply. This system is commonly used for backup power which may be used for running the loads in non-sunny hours e.g. powering traffic signals and streetlights, billboards, backup power for houses, pumps, etc. in cities and remote rural locations that have either fluctuating grid connectivity or do not have access to grid electricity.

The design of your Rooftop Solar PV system depends on the availability of electricity, power quality, electricity tariff and your energy consumption pattern.

If you have grid connectivity, we recommend on-grid systems because they can more economically meet your energy requirements and provide flexibility of using a grid-hybrid system also. By using grid-hybrid systems, you can even store solar energy generated during the day for your night-time loads. If you need to choose Solar PV systems for schools, colleges, etc. which are closed on weekends, you can use net-metering mechanism to feed-in the extra power to the grid thereby avoiding any loss of solar power generated.

If you don’t have grid supply or have a poor (fluctuating) voltage, you may consider an off-grid system. This system is more expensive than an on-grid system because of the additional installation and maintenance cost of batteries.

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

The average cost of Grid-connected Rooftop Solar System is about Rs. 80 per watt or Rs. 8.0 crore per MWp capacity. We also provide a tentative estimate for various capacities that ar ready to be installed on your residences. How much does a Solar PV system cost?

System type and size have a huge impact on the overall pricing of a solar PV system. In solar, bigger is better, since per unit prices fall with increase in scale.

Indicative cost for various system sizes is shown in the below table:

 

Grid-connected System
Size (kWp)

System Cost (Rs k) per kWp

(Inclusive of taxes, freight, etc. and price denoted in 000)

1-3

3-5

5-10

10-30

30-50

50-100

100-1000

Utility scale 10MWp

Off-grid system with 1 day battery backup

108~112k for 1 kWp system