EPC photovoltaic process – The Construction phase


After analyzing the first two phases of the EPC photovoltaic service, this article will focus on the most practical phase of installation of the various components that make up the plant.

The main steps that characterize the part of  “Construction” are:

Installing the module support structure
Whether it is a photovoltaic system on a roof or a ground-based plant, the fixing of photovoltaic modules must be guaranteed by means of a suitable support structure. The support structure is usually made up of metal profiles (brackets) that are assembled manually and secured in various ways (by means of screws, bolts, clamps, ballasts or poles attached to the ground with special punching machines).

Assembling photovoltaic module strings
The strings are then assembled on the support structure: typically 20-30 rows of photovoltaic modules connected in series by means of special quick couplers (called MC4). The fixing is carried out by means of special clamps that slide on the bracket guides to allow proper calibration of the relative positions of the modules.

Junction Box placed on the back of the photovoltaic module for connecting the MC4 connectors

A photovoltaic module (power ranging from 260 W to 320 W) has typical dimensions of 1mx2m with a weight of about 20-25 kg, so a 1 MWp photovoltaic system, consisting of strings of about 5-10 kW each, requires 10,000- 20,000 m2 of gross space available

Linking strings
Multiple string groups can be linked:
– directly to a string inverter
– to a parallel frame (said field or string frame)
These components are indispensable to ensure plant safety and to interrupt the current of the string in case of maintenance or to protect the system from overcurrents and overvoltages.

String Inverter (on the left) + Field String for Linking Strings (on the right)

Rooms/Cabins of Transformation and Delivery
The cables coming from the photovoltaic field are conveyed to a technical venue (in case of plant on the ground specially created transformation and delivery cabins), in which the components that transform the electricity are then installed and then are self-consume and / or sold to the power grid, including: centralized inverter (when using parallel frames), BT / MT transformer (for installations over 100/200 kWp) and low and medium voltage switchboards.

Transformation and delivery cabin

Balance of System (BOS)
Balance of System includes all components outside the photovoltaic modules, ie assembly systems, cabling (including foundations, excavations and pipes) and transformation to integrate modules into the structural and electrical systems of the assembly or installation area.

After completing the construction of the photovoltaic system, the commissioning phase includes all the tests and tests required to verify the correct functioning of the installed systems. Among these, the most important ones are listed: checking voltage and current levels, checking the protective and grounding devices, checking electrical circuit isolation, ignition, shutdown, and mains failure.

Articoli correlati

2018 Renewable energy statistics in Italy
23 July 2019
The legislation of photovoltaic systems in Italy and the new FER 1 Decree
8 July 2019
Challenges of Utility Scale Solar PV Projects
3 June 2019
Self-consumption and electricity sales options for photovoltaic systems
25 May 2019
The advantages of industrial rooftop photovoltaic systems
20 May 2019
The importance of choosing a qualified solar EPC contractor
3 May 2019
How much energy does a solar photovoltaic panel produce?
1 April 2019
Utility Scale Solar farms are seeing exponential growth
20 March 2019
MENA Solar Energy Outlook 2019
23 January 2019
Enerray’s expanding business in MENA
9 January 2019
Algeria starts its renewable energy future with a 150 MW solar PV tender
17 December 2018
Oman will build the largest solar park in the region
12 November 2018
Utility Scale Solar PV Parks in UAE and Gulf Area
17 October 2018
Commercial and industrial rooftop solar systems in UAE and Gulf Area
25 September 2018
Design and construction of photovoltaic shelters
20 September 2018
In Dubai is borning a sustainable city powered by renewables
30 August 2018
Tunisia plans to improve its economy and invest in green energy
28 August 2018
MENA Region Solar Energy Oulook 2018
24 July 2018
The Benban Solar Park shines Egypt’s renewable energy targets
17 July 2018
Shams Dubai program and DEWA’s initiatives to increase solar power in Dubai
22 June 2018
Solar power, an optimal source of energy in places where there is lack of water
11 June 2018
How a PV system works?
30 May 2018
Socio-Economics Benefits from Renewable Energies – MENA Region
22 May 2018
What are the advantages and disadvantages of solar energy?
18 May 2018
The transition to a fully renewable powered energy system in Southeast Asia
14 May 2018
How does solar energy work and how can it be converted into electricity ?
10 May 2018
The transition to a fully renewable powered energy system in Latam
20 April 2018
The transition to a fully renewable powered energy system in the MENA region
30 March 2018
A global transition to 100% renewable electricity is feasible
26 March 2018
Photovoltaic Energy spreads in the emerging economies. Focus on Latam countries
15 February 2018