Guidelines And General Specifications for Grid-connected Small Scale (Rooftop) Solar PV Systems for U.T of Puducherry

Scope and Purpose

These Guidelines for grid-connected small scale (rooftop) solar PV systems have been prepared for the benefit of Resident, Industrial and Social sector of U.T of Puducherry. Following is a guideline document only.

Grid-connected solar PV Systems

There are basically two solar PV systems: stand-alone and grid-connected.

Stand-alone solar PV systems

The solar energy is stored in the battery and used to feed building loads after conversion from DC to AC power with a stand-alone inverter. Generally this is used in remote areas without grid supply or with unreliable grid supply. The batteries require replacement once in every 3 – 5 years.

System Components

A grid-connected solar PV system consists of the following main components:
  1. Solar PV (photo-voltaic) array.
  2. Solar PV array support structure.
  3. Solar grid inverter.
  4. Protection devices.
  5. Cables.

Solar Net-metering

The “net-metering” has been introduced in UT. In net-metering, the solar energy exported to the grid is deducted from the energy imported from the grid subject to certain conditions. The consumer pays for the net-energy imported from the grid. To enable net-metering PED will replace the existing service connection meter with a bidirectional meter that displays the import and export energy separately.

Rooftop and Installation Requirements

The shadow-free area required for installation of a rooftop solar PV system is about 12 m2 per kW (kilowatt). The solar panels may be installed on the roof of the building with a south facing tilt angle that varies from 11 – 13 degrees depending on the latitude of the location in Puducherry.


Solar Array Capacity
The capacity of a solar PV array (in kWp, kilowatt-peak) depends 90% energy consumption of the building on and the shade-free rooftop (or other) area available.
  1. The roof (or elevated structure) area requirement per kW of solar PV modules is about 12m².
  2. In Puducherry the typical average annual energy generation per installed kW of solar PV capacity is 1,800 kWh. (This number assumes a system capacity utilization factor of 18% and average grid availability of 95% during the daytime).
With these assumptions, the recommended capacity of the solar modules array of a proposed grid-connected solar PV system can be calculated with the following three steps.
Step 1:

Calculate the maximum system capacity on the basis of the shade free rooftop area.
Formula: Capacity = shade-free rooftop area (in square meters) divided by 12.
Example: The shade-free rooftop area is 60 m².
The maximum solar PV capacity that can be installed on this rooftop area would be 60 / 12 = 5 kWp

Step 2:

Calculate the system capacity based on annual energy consumption.
Formula: Capacity = 90% of annual energy consumption (in kWh) divided by 1,800.
Example: The (estimated) annual energy consumption is 18,000 kWh The solar PV system capacity based on annual energy consumption would be (90% x 18,000) / 1,800 = 9 kWp
Recommended Capacity : Take the lowest of the above two capacity calculation results. In this example: 5 kWp

Solar Grid Inverter Capacity

The recommended solar grid inverter capacity in kW shall be in a range of 95% - 110% of the solar PV array capacity. In the above example, the solar array capacity was calculated to be 5 kW. The solar grid inverter required for this array would be in a range of 4.75 – 5.50 kW.


     The MNRE of the Government of India provides capital subsidies for solar PV systems subject to certain conditions. As of date (March 2016) the capital subsidy for rooftop solar PV systems is 30% of the benchmark cost or 30% of the actual cost, whichever is less. For technical specifications,
Please visit,



     MNRE under UNDP-GEF has appointed M/s. TERI, New Delhi for (central – Southern region) consulting support for preparation preliminary reports for installation of CST projects. There are two numbers of reports (One on Community solar cooking and other on process of Heat and cooling applications). M/s Tata Resource Institute (TERI), New Delhi, for solar thermal activities and collected preliminary details in Puducherry region.

      Ministry of New and Renewable Energy has given the target 30 numbers of CST based systems has to be covered by REAP, Puducherry, out of 150 numbers of system. In this connection, REAP have visited 36 numbers of establishments sites as per the letter stated by MNRE New Delhi for preparation on possible installations of concentrated solar techniques (CST) projects, in Puducherry.

      MNRE have providing 30% subsidy from the total cost of the project.
For the further subsidy details,please visit the link :


     The Ministry of New and Renewable Energy has been promoting the establishment of Aditya Solar Shops in major cities of the country since 1995 with a view to make solar energy products easily.
     Under the present scheme, the shops are renamed as “Akshaya Urja Shops” with a view to cover wider sale and service of all renewable energy devices and systems including solar energy products. The network of the shops will be expanded by encouraging private entrepreneurs and NGOs to set up and operate such shops in all districts of the country.

Download : List of Akshaya Urja Shop in UT of Puducherry


     REAP was awarded national third best among States and smaller States for CST based cooking system projects undertaken. Honorable Union Minster Piyush Goyal presented the national award to REAP.

      Honorable Puducherry Lieutenant Governor Dr.KiranBedi felicitated the REAP team for initiating various solar technology programmes in the U.T. of Puducherry.



     As per the guidance of Bureau of Energy Efficiency (BEE), State level Painting Competition is conducted on “Energy Conservation" for the school children of 4th, 5th and 6th standards (Category 'A') and 7th, 8th and 9th standards (Category 'B') every year in the month of November in the Union Territory of Puducherry by Rural Electrification Corporation (REC), Ministry of Power and in co-ordination with Directorate of School Education, Puducherry and Renewable Energy Agency of Puducherry (REAP).
     The 1st, 2nd & 3rd prize winners of Category 'A' shall be sent to National Level Painting Competition organized by Bureau of Energy Efficiency (BEE) in co-ordination with Ministry of Power (MoP) which will be held every years in the month of December at New Delhi.
     As far as Category 'B' is concerned, the paintings of first, second and third prize winners of State/UT level Painting Competition shall be sent to Bureau of Energy Efficiency (BEE) for their selection for National level prizes.
Aim of the competition: The aim of conducting painting competition for school children is to paint a world of imagination and discover the magic of clean , green and energy efficient future; a future, which they will inherit. In this process, the children will not only learn a few good things but will also teach us a few new things.






     Hon’ble Prime Minister has announced skill India Programme, in the month of June 2015, Ministry of New and Renewable Energy (MNRE) assigned the responsibility to NISE (National Institute of Solar Energy) to Country wide launch prestigious Suryamitra Skill Development programme with a target to develop 50,000 Suryamitras by the year 2019 for the country. The objective of the Suryamitra has been designed to develop skilled and employable workforce (Suryamitras) catering to the needs of Solar PV Industries and EPC Projects as below.

  1. The Suryamitras should able to perform the jobs related to design, component procurement, site survey, installation, commissioning and operation & maintenance of a Solar Photovoltaic system in EPC projects.
  2. The Suryamitras should be able to take position as SPV Technicians as well as other supervisory and Managerial posts in Solar PV Component manufacturing organisation.
  3. The Suryamitras should also be capable of taking assignments as entrepreneurs for self-employment.
  4.      The duration of this skill development program is 600 hrs (approx 90 days) and the eligibility of the Participants should be I.T.I in Electrical/Wireman trades or Diploma in Electrical/Electronic/Mechanic/equivalent. The minimum age limit is 18 but there is no upper limit age. The batch contains 30 participants and the preference will be given for First come First Serve. This is the residential program and it is free which includes boarding and lodging. However REAP has conducted one Suryamitra Programme through Karaikal Polytechnic and more than 6 Suryamitras were employed.
         Currently, REAP has planned to conduct second SuryamitraProgramme through Women Polytechnic College, Puducherry. Those who are interested they may contact REAP Staff for enrolment.