About Rooftop Solar

Solar Photovoltaic modules and allied electrical equipment are installed on residential and commercial rooftops and connected to the power grid. These are known as Grid- connected Rooftop Photovoltaic systems. The GRPV system comprises of electrical and electronic equipment, such as solar modules, inverters, cables, switch gears, etc. When all these components are combined together and placed in open space facing sunlight, the system starts generating electricity proportional to the intensity of sunlight. The electricity, thus generated, can be used directly by the consumer. If consumer is not able to use complete electricity generated by GRPV system, the excess electricity generated can be fed to the utility grid (DISCOM network) and the units get adjusted in the electricity bill. It is important to mention here that 1 kW of solar PV plant can generate more than 1200 units of electricity in a year.


The function of each component of solar PV system is explained as follows:

Solar PV Modules - Solar PV Modules are in the form of flat, rectangular panels which convert sunlight directly into electricity. Multiple panels are connected together to form arrays as per the desired capacity of the system. Solar Inverter - Solar Inverters convert the DC electricity produced by the PV panels into AC electricity which can then be consumed by appliances within the premises or injected into the DISCOM grid.

Balance of System (BoS): - All components, other than the PV modules, are termed as balance of system. The components included in BoS are:

Mounting Structure: The mounting structure supports and holds the PV panels in place on the roof. The structure is designed depending on the roof type, structural strength, cost, wind loads, etc.

Wiring and cabling: DC cables are used to connect solar panels and connect the array with the inverter.

Safety equipment: Safety features protect the solar PV system from being damaged or harming people in events, such as lightning, power surge or malfunctioning of equipment. The safety equipment consists of safety disconnect, grounding equipment, and surge protection.

Bi-directional Meters: Bi-directional meters (or “Net” Meters) are used to keep track of the electricity that solar PV system injects to utility grid and the electricity that is drawn from the utility grid.

Benefits of rooftop solar

Electricity bill reduction, Minimal maintenance, Silent Operation, Community advantages, No negative health impacts, Green Energy, Climate change mitigation, Combats Air Pollution

Step by step guide for installation of rooftop solar

  • Express interest through website or mobile app or offline form - Residential Consumers can express interest by applying online, through offline form or the mobile APP for the installation of Rooftop Solar System
  • Select vendor for installing the system - The interest expressed shall be notified to registered solar installers, who will then contact you and visit your premises to assess the feasibility for installation of solar plant.
  • Feasibility study and Installation Agreement - Selected vendor will conduct feasibility study for installation of rooftop solar plant at your premises. After establishing feasibility, you will be presented with an option to enter into an agreement with the vendor for installation.
  • Application for Net – Metering
  • Installation and commissioning of Solar plant

Policy & Net Metering Regulations

Low Volume
Notified By Gujarat Electricity Regulatory Commission
Policy Gujarat Solar Power Policy 2015
Net Metering Regulations Regulations for Net Metering Rooftop Solar PV Grid Interactive Systems 2016
Min System Size allowed (under net metering) 1 kW
Max System size allowed (under net metering) 1 MW
Cap w.r.t sanctioned load 100% for domestic consumers & 50% for C&I consumers
Rooftop ownership Persons who intend to install Rooftop Solar should own the rooftop as well.
Cap w.r.t Distribution Transformer Capacity 65%

Subsidy info

  • beneficiaries can recive subsidy of 40% upto 3KW and subsidy of 20% for system of 3 to 10 KW.The scheme would be applicable during the operative period of Gujarat Solar Policy—2015, that is, March 31, 2020.
  • The consumer should install only new plant and machinery and should not shift the plant elsewhere.
  • The beneficiary should own the rooftop solar system and also should be in legal possession of the premises including the rooftop and terrace on which the plant is installed.
  • Local Discom, in Gujarat GUVNL or Torrent Power, would be the nodal agency for the scheme and would release subsidy to the applicant after successful installation and commissioning of the system.