The total installed power should be greater than 99kWp and less than or equal to 100kWp.

PV Panels must be exclusively flat type, not centralized type and without the use of reflectors and mirrors.

For the purposes of the present, "PV Panels of the same type (Models)" are defined as PV Panels that, in relation to those offered, must meet the following conditions:

The PV Panels will be of the same type, namely:

• of the same technology (monocrystalline or polycrystalline silicon) from the same manufacturer,
• they will have the same external dimensions,
• they will have the same number of PV cells (cells) of the same dimensions, in a similar electrical connection between them,
• they will belong to the same series, as shown by the manufacturer's official categorization.

The PV Panels will be of monocrystalline or polycrystalline silicon technology, at least 72 cells and of the same nominal power, which will be at least 330 Wp each for optimal use of the available space.

PV Panels will meet the specifications of the international certification organization International Electrotechnical Commission, IEC 61215, IEC 61730-1, IEC 61730-2 or equivalent.

The PV panels will be accompanied by a performance guarantee for a period of twenty-five (25) years.

The PV panels will come with a 12-year factory product warranty.

The PV panels will come with a 25-year performance guarantee with:

• energy efficiency of at least 97.50% in the 1st year, and
• loss of performance of a maximum of 0.60 % per year (from the 2nd year to the 25th).

The PVs are characterized as "of the same type (Model)" if they meet all the above conditions, but they may have a different nominal power (Wp), for reasons that are solely due to the sorting (sorting) due to the flashing test.

In addition, the PV panels:

• They will have CE certification from a competent body.
• They will be certified for increased mechanical resistance to a snow load of 5400 Pa on the face and at least 2400 Pa for wind pressure.
• They will have undergone a salt mist test according to IEC 61701, “Severity 6, Salt Mist corrosion Testing of Photovoltaic (PV) Modules”
• They will have certification of fulfillment of the "Ammonia Resistance Test" according to IEC 62716.
• they will have undergone a PID (Potential Induced Degradation) test, with the following conditions and criteria:
• Time: 96 hours.
• Relative humidity: 85%.
• Positive and Negative Polarity: 1.000V.
• Temperature: 85°C.

The PID test may have been conducted for photovoltaic panels of the manufacturing company that belong to the same category and have a different number or type of cells.

PV Panels will have a proper installation manual.

Maximum system voltage will be 1000V or 1500V.

The Temperature Power Derating Factor Pmax [%/ºC] shall not be greater in absolute value than 0.38.

The aluminum frame will be anodized.

There will be a place to ground the aluminum frame, for protection reasons.

The junction box must have at least IP67 characteristics.

An appropriate number of string power inverters, with a total rated power of at least 99kW, will be installed.

The power converters to be installed will meet the following specifications as a minimum:

• Will be from the same manufacturer.
• They will be three-phase with the possibility of operation at 400/230V, 50Hz
• The European degree of efficiency will not be less than 97.6%. The maximum degree of efficiency will not be less than 98%.
• They will have at least IP 65 protection.
• There will be a hardware and product warranty for at least 5 years.
• There will be a proper installation and operation manual.
• They will have Modbus and/or RS232 and/or RS485 and/or RJ45 and/or wireless communication protocol.
• They will have an islanding protection system, according to DIN VDE 0126-1-1 or equivalent.
• It should be possible to adjust the voltage and frequency limits at the output of the converter, which in no case should exceed +15% to -20% of the nominal voltage.
• The total harmonic distortion of the inverter current should not exceed 4%.
• Since each converter does not have an isolation transformer, the direct current injection (DC CurrentInjection) should be limited to 0.5% of the nominal current.
• The factory of origin will have an ISO 9001 certificate.

DC wiring

Cable Specifications:

The solar type DC cable shall meet the specifications of IEC 60228 and IEC 62930:2017 and specifically the following requirements:

• Certified according to the updated harmonized European standard EN 50618 (marking H1Z2Z2-K).
• Tinned copper conductor, according to VDE 0295 class 5 or EN/IEC 60228 class 5
• Rated operating voltage 1000 VDC or 1500 VDC.
• Maximum duct operating temperature of at least 90 OC.
• Operation under external temperature (ambient temperature) -40…+90 OC.
• Flame retardants (characteristics that retard combustion IEC 60332-1-2).
• Halogen free (IEC 60754-1).
• Resistance to environmental conditions and solar radiation (UV).
• Ozone-resistant according to EN 50396.

Low Voltage AC Wiring

The cables to be used can be HO7RN-F type and J1VV-R/S type.

Cable Specifications

The HO7RN-F type cable will have the following specifications:

• Copper conductor, according to VDE 0295 class 5 / IEC 60228 cl. 5
• Insulation and outer jacket of ducts made of special rubber
• Resistant to short circuits and earth leakage according to IEC 60364-5-52/ HD 60364-5-52/ VDE 0100 Part 520 regulations
• Operating voltage: 450/750V
• Temperature range: -40 to +90 OC
• Ozone resistance according to EN 60811
• Oil resistance according to EN 60811
• Flame retardant according to IEC 60332
• Low smoke appeal according to EN 61034-2
• Halogen-free according to EN 60754
• Bending strength

Type J1VV-R/S cables should have:

• Nominal voltage: 600/1000V
• Thermoplastic insulation and PVC jacket according to ELOT 563 – HD 843
• Suitable for outdoor installation.

Communication System Cabling

General design

The study and design of the Lightning Protection System of the surge protection and the grounding system of the direct current network shall be carried out in accordance with the following standards or their equivalents:

• ELOTEN 62305.01: 2006, “Lightning protection - Part 1: General principles”.
• ELOTEN 62305.02: 2006, “Lightning protection - Part 2: Risk management”.
• ELOTEN 62305.03: 2006, “Lightning protection - Part 4: Electrical and electronic systems within structures”.
• ELOTEN 62305.04: 2006, “Lightning protection - Part 3: Physical damage to structures and risk to life”.
• ELOT EN60664.01 E2: 2007, “Coordination of insulation for equipment within low voltage systems - Part 1: Principles, requirements and tests”
• 11: 2002, “Low-voltage devices for protection against overvoltages - Part 11: Devices for protection against overvoltages connected to low-voltage networks - Requirements and tests”.
• 11/A11: 2007, “Low-voltage devices for protection against overvoltages - Part 11: Devices for protection against overvoltages connected to low-voltage networks - Requirements and tests”.
• 21: 2001, “Low-voltage devices for protection against overvoltages - Part 21: Low-voltage devices for protection against overvoltages connected to telecommunications and signaling networks - Functional requirements and test methods”
• 12: 2006, “Low-voltage devices for surge protection - Part 12: Surge protection devices connected to low-voltage networks - Principles of selection and application”.
• IEC 61643 – 22, “Low voltage surge protective devices – Part 22: SPDs connected to telecommunication and signaling networks – Selection and application principles”.
• ELOTEN 50164 – 1, “Lightning Protection Components (LPC), Part 1: Requirements for connection components”.
• ELOTEN 50164 – 2, “Lightning Protection Components (LPC), Part 2: Requirements for conductors, and earth electrodes”. ELOTEN 50164 – 3, “Lightning Protection Components (LPC), Part 1: Requirements for isolating spark gaps”.
• ELOT EN60071.02: 1997, “Coordination of insulation - Part 2: Application guide”.
• ELOT EN60071.01 E2: 2006, “Coordination of insulation - Part 1: Definitions, principles and rules”.
• ELOTEN 61557.08 Е2: 2007, "Electrical safety in low-voltage distribution systems up to 1 kV alternating current and 1.5 kV direct current - Equipment for testing, measuring or monitoring protection measures - Part 8: Isolation of monitoring devices for IT systems".
• ELOTHD 60364.01: 2008, “Low voltage electrical installations - Part 1: Fundamental principles, determination of general characteristics, definitions”.
• IEC 60099-4: 2001, “Metal-oxide surge arresters without gaps for a.c. systems”.
• IEC60947-4-1: 2002, “Electromechanical contactors”.
• IEC 60364-5-53:2001, “Electrical installations of buildings – Part 5-53: Selection and erection of electrical equipment – ​​Isolation, switching and control.
• ELOT HD60364.07.712: 2005, "Electrical installations of buildings - Part 7-712: Requirements for special installations or spaces - Solar photovoltaic power supply systems".
• ELOTHD 60364.0: 2007, “Electrical installations of buildings - Part 5-54: Selection and installation of electrical equipment - Grounding devices, protective conductors and protective connecting conductors”.
• ELOT HD 384 E2: 2004, "Requirements for electrical installations".
• IEEE 80/2000
• IEEE 81/1983, IEEE81.2/1991
• ELOT HD 637S1/2000
• DIN VDE 0141/1989
• DIN VDE 18014/1994
• IEC 364
• DIN VDE 0100

The design of the Lightning Protection System (SAP) will be based on the ELOT EN 62305 (2006) series of standards. The level of anti-lightning protection (Lightning Protection Level - LPL) will be determined after a risk analysis (risk assessment) in accordance with the standard EN 62305.02, for the protection levels defined in EN 62305.01.

An appropriate electronic data recording system should be installed. The monitoring, control and measurement collection system of AC/DC Inverters will consist of units for collecting, processing and storing the information from the sensing and measuring instruments and control instruments installed locally (they may also be integrated into the Equipment). This unit records, stores, transmits and displays the production data of the Inverters and the PV station, uninterrupted on a 24-hour basis.

The electrical installation will be done in accordance with the Greek electrical regulations ELOT HD-384 regarding harmonic and electromagnetic compatibility, Greek legislation. The dimensioning of the cross-sections of the AC cables will be studied with the main aim of minimizing the resistive losses. A DC panel will be placed before the PV inverter to which its PV arrays will be connected, which will include:

• 2 x 10x38 mm 1000V DC or 1500 VDC fuse box. (Not required if a maximum of 2 Strings are connected per MPPT)
• gPV type fuses (not aR/DC or gG/AC) on each pole of the string, properly sized according to the requirements of the PV panels and the inverter (1000V DC or 1500VDC). Not required if a maximum of 2 Strings are connected per MPPT.
• Surge arresters of at least type T2
• Load switch of appropriate Amps

An AC panel will be installed after the inverter, which will include:

• automatic properly dimensioned four-pole fuse
• Surge arrester of at least T2 to protect the AC output of the Converter