Technical Specifications

[Grid connected solar photo voltaic power plant (for the individuals/private user)]


Solar Photo voltaic Modules
  • The PV modules shall be of indigenous make.

  • Module shall consist of Solar Cell of minimum 3 Bus Bar technology.

  • Test Certificate issued by one of the IEC authorized test centers.

  • The total solar PV array capacity should not be less than plant capacity (kWp).

  • The efficiency of the PV modules should be minimum 15% and fill factor should be more than 70%.

  • Test Certificate issued by one of the IEC authorized test centers.

  • I-V curves at STC shall be provided with the module.

  • Modules of any type mono/poly crystalline or thin film can be used

  • Each PV module must use RFID tag which must contain information as per MNRE requirements

Power Conditioning Unit (PCU)/Inverter

  • The combined wattage of all inverters should not be less than rated capacity of the power plant under STC.

  • Shall have Maximum Power Point Tracker (MPPT).

  • Shall have function to supply the power to load in combination of PV and Grid if PV supply is short than load.

  • PCU shall also be DG set interactive, if required.

  • Shall be capable of complete automatic operation including wake-up, synchronization & shutdown.

  • PCU/ inverter should have internal protection arrangement against any sustainable fault in feeder line and against the lightning on feeder.

  • Shall have built-in meter and data logger (for systems of > 10 KWp capacity) to monitor plant performance through external computer shall be provided.

  • Shall have test certificates from the MNRE approved test centres / NABL /BIS /IEC accredited testing- calibration laboratories or by international test houses.

  • Protection of Enclosure: IP-20(Minimum) for indoor & IP-65(Minimum) for outdoor.

  • Efficiency(minimum) : 95

  • PF : > 0.9

Mounting structures

  • The PV modules should be mounted on metallic structures of adequate strength and appropriate design, which can withstand load of modules and high wind velocities up to 150 km per hour.

  • The support structure used in the system should be hot dip galvanized iron with minimum 80 micron thickness or made of Aluminum of adequate strength and appropriate design.

Junction Boxes
  • The Junction Boxes (JBs) shall be made of GRP/FRP/Powder Coated Aluminum /cast aluminum alloy with full dust, water & vermin proof arrangement.

  • Each Junction Box shall have High quality Suitable capacity Metal Oxide Varistors (MOVs) / surge arrestors, suitable Reverse Blocking Diodes.


  • The system should be provided with all necessary protections like grid islanding, Surge protection, earthing, Lightning.

  • Each array structure of the PV yard should be grounded/ Earthed properly as per IS:3043-1987. In addition the suitable nos. of lighting arrester/masts should also be provided inside the array field.

  • The Rooftop PV system shall be equipped with anti-islanding protection. In addition to disconnection from the grid (due to islanding protection) due to under and over voltage conditions shall also be provided.

  • A manual disconnect pole isolation switch beside automatic disconnection to grid would have to be provided between PCU and bidirectional meter to isolate the grid connection by the utility personnel to carry out any maintenance. This switch shall have provision of locking by the utility personnel.

  • Protection shall met the safety rules as per IE Act.

System Monitoring Parameters

  • Inverter/PCU voltage & current

  • Mains Voltage, Current & Frequency

  • PV Voltage, Amps & KWh

  • System Mimic & Faults

  • Battery voltage, Current & Temperature (in case of hybrid system)

Connecting Cables (DC & AC) and accessories
  • All cables to be supplied should be as per BIS and should have proper current carrying capacity and should not be heated.

  • DC Cables of various sizes as per load requirement for connecting all modules /arrays to junction boxes and from junction boxes to PCU should be used.

  • Only copper wire of appropriate size based on load requirement of reputed make shall have to be used.

  • The size of each type of DC/AC cable selected shall be based on minimum voltage drop however; the maximum drop shall be limited to 2%.


  • The PV Modules must be warranted for output wattage, which should not be less than 90% of rated output at the end of 10 years and 80% of rated output at the end of 25 years.

  • The whole system shall be warranted for 5 years along with 5 years AMC.

Integration of PV power with grid
  • The output power from PCU shall be synchronized with Grid Power. In case of grid failure, or low or high voltage, solar PV system shall be out of synchronization and shall be disconnected from the grid.

  • Once the DG set comes into service PV system shall again be synchronized with DG supply and load requirement would be met to the extent of availability of power.

Metering Arrangement

  • The bidirectional electronic energy meter (0.5 S class) shall be installed for the measurement of import/Export of energy.

  • An electronic meter (certified by the DISCOM) to measure the solar generation shall also be installed.

  • The user must take certificate from the concerned DISCOM certifying that the net metering connection has been done with all protections/security measures.

  • Priority needs to be given for internal consumption first and thereafter any excess power can be exported to grid.

Safety Measures
  • It is the entire responsibility of the system supplier for providing all electrical safety measures in the installation(s) including connectivity with the grid and follow all the safety rules & regulations applicable as per Electricity Act, 2003 and CEA guidelines etc. All work shall be carried out in accordance with the latest edition of the Indian Electricity Act and rules formed there under and as amended from time to time.


  • For systems of capacity 10 kWp and above, web based remote monitoring which shall also be linked with HAREDA software monitoring system.

Note:If required, minimum battery bank can be installed with the system.


a. In case of Power plant without battery bank (i.e. with string inverter), the existing uni-directional meter of the user shall be installed for gross metering of solar generation while a Bi-directional meter shall be installed for net-metering purpose.
b. In case of Power plant with battery bank (i.e with PCU), one DC energy meter shall be installed separatly for gross metering of solar generation while a Bi-directional meter shall be installed for net-metering purpose.
c. CEA guideline 2013 for interconnecting solar power with Grid shall be followed.
d. Certification of Islanding protection in the inverter/PCU from the manufacturer of the equipment shall be mandatory. This shall be arranged by the supplier from the manufacturer.
e. Verification report/test report shall be issued by the DISCOM or their authorized agency.
f. All switches and the circuit breakers, connectors should conform to IEC 60947, part I, II and III/ IS60947 part I, II and III.


Regarding the generated power consumption, in case of string inverter, priority need to given for internal consumption first and thereafter any excess power can be exported to grid. In case of hybrid system the PCU shall have the function of combining the power from SPV and Grid (in case load is greater than PV power available), first priority shall be from Solar, second from grid and third from battery bank or priority shall be adjusted on the user choice.


The quality of equipment supplied shall be controlled to meet the guidelines for  engineering design included in the standards and codes listed in the relevant ISI and other standards, such as :

a. IEEE 928 Recommended Criteria for Terrestrial PV Power Systems.
b. IEEE 929 Recommended Practice for Utility Interface of Residential and Intermediate PV Systems.
c. IEEE 519 Guide for Harmonic Control and Reactive Compensation of Static Power Controllers.
d. National Electrical NEPA 70-(USA) or equivalent national standard.
e. National Electrical Safety Code ANSI C2- (USA) or equivalent national standard.
f. JRC Specification 503 (Version 2.2 March 1991) or JPL Block V standard for PV modules.
g. The inverter manufacturer should attach efficiency certificate from Independent Third party Testing laboratory i.e. IEC, TUV, SNL/ERTL & STQC.  PCU should confirm to IEC 61683 for efficiency measurements and IEC 60068 2 for environmental testing. MPPT unit should confirm to design qualification IEC 62093.
h. IEC 62116  for Anti Islanding
i. IEC 62109-1, IEC 62109-2 for safety
j. IEC 61727 For Utility Interface.