Concentrator photovoltaic (CPV) modules and assemblies - Design qualification and type approval

IEC 62108:2022 is available as IEC 62108:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 62108:2022 specifies the minimum requirements for the design qualification and type approval of concentrator photovoltaic (CPV) modules and assemblies suitable for long-term operation in general open-air climates as defined in IEC 60721-2-1. The object of this test document is to determine the electrical, mechanical, and thermal characteristics of the CPV modules and assemblies and to show, as far as possible within reasonable constraints of cost and time, that the CPV modules and assemblies are capable of withstanding prolonged exposure in climates described in the scope.

Modules et ensembles photovoltaïques à concentration - Qualification de la conception et homologation

IEC 62108:2022 est disponible sous forme de IEC 62108:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 62108:2022 spécifie les exigences minimales relatives à la qualification de la conception et l'homologation des modules et ensembles photovoltaïques à concentration (CPV - concentrator photovoltaic) pour une utilisation de longue durée dans les climats généraux d'air libre, comme cela est défini dans l'IEC 60721-2-1. Le présent document d'essai a pour objet de déterminer les caractéristiques électriques, mécaniques et thermiques des modules et ensembles CPV et de montrer, autant que possible avec des contraintes de coût et de temps raisonnables, que les modules et ensembles CPV peuvent supporter une exposition prolongée aux climats définis dans le domaine d'application.

General Information

Status
Published
Publication Date
01-Jun-2022
Current Stage
PPUB - Publication issued
Completion Date
02-Jun-2022
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IEC 62108
Edition 3.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Concentrator photovoltaic (CPV) modules and assemblies – Design qualification
and type approval
Modules et ensembles photovoltaïques à concentration – Qualification de la
conception et homologation
IEC 62108:2022-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62108
Edition 3.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Concentrator photovoltaic (CPV) modules and assemblies – Design qualification
and type approval
Modules et ensembles photovoltaïques à concentration – Qualification de la
conception et homologation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-3824-0

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62108:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 5

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 9

4 Sampling ....................................................................................................................... 10

5 Marking ......................................................................................................................... 11

6 Testing .......................................................................................................................... 11

7 Pass criteria .................................................................................................................. 12

8 Report ........................................................................................................................... 20

9 Modifications ................................................................................................................. 21

10 Test procedures ............................................................................................................ 21

10.1 Visual inspection ................................................................................................... 21

10.1.1 General ......................................................................................................... 21

10.1.2 Procedure ...................................................................................................... 21

10.1.3 Major visual defects ....................................................................................... 22

10.1.4 Requirements ................................................................................................ 22

10.2 Electrical performance measurement .................................................................... 22

10.2.1 Purpose ......................................................................................................... 22

10.2.2 Outdoor side-by-side I-V measurement .......................................................... 22

10.2.3 Solar simulator I-V measurement ................................................................... 24

10.2.4 Dark I-V measurement ................................................................................... 24

10.3 Ground path continuity test ................................................................................... 25

10.3.1 General ......................................................................................................... 25

10.3.2 Purpose ......................................................................................................... 25

10.3.3 Procedure ...................................................................................................... 25

10.3.4 Requirements ................................................................................................ 25

10.4 Electrical insulation test ........................................................................................ 26

10.4.1 Purpose ......................................................................................................... 26

10.4.2 Procedure ...................................................................................................... 26

10.4.3 Requirements ................................................................................................ 26

10.5 Wet insulation test ................................................................................................ 27

10.5.1 Purpose ......................................................................................................... 27

10.5.2 Procedure ...................................................................................................... 27

10.5.3 Requirements ................................................................................................ 27

10.6 Thermal cycling test .............................................................................................. 27

10.6.1 Purpose ......................................................................................................... 27

10.6.2 Test sample ................................................................................................... 28

10.6.3 Procedure ...................................................................................................... 28

10.6.4 Procedure for active cooling system .............................................................. 30

10.6.5 Requirements ................................................................................................ 30

10.7 Damp heat test ..................................................................................................... 31

10.7.1 Purpose ......................................................................................................... 31

10.7.2 Test sample ................................................................................................... 31

10.7.3 Procedure ...................................................................................................... 31

10.7.4 Requirements ................................................................................................ 32

---------------------- Page: 4 ----------------------
IEC 62108:2022 © IEC 2022 – 3 –

10.8 Humidity freeze test .............................................................................................. 32

10.8.1 Purpose ......................................................................................................... 32

10.8.2 Test sample ................................................................................................... 32

10.8.3 Procedure ...................................................................................................... 32

10.8.4 Requirements ................................................................................................ 32

10.9 Hail impact test ..................................................................................................... 33

10.9.1 Purpose ......................................................................................................... 33

10.9.2 Apparatus ...................................................................................................... 33

10.9.3 Procedure ...................................................................................................... 34

10.9.4 Requirements ................................................................................................ 34

10.10 Dust and water ingress protection test .................................................................. 34

10.10.1 Purpose ......................................................................................................... 34

10.10.2 Procedure ...................................................................................................... 35

10.10.3 Requirements ................................................................................................ 35

10.11 Bypass/blocking diode thermal test ....................................................................... 35

10.11.1 Purpose ......................................................................................................... 35

10.11.2 Test sample ................................................................................................... 35

10.11.3 Apparatus ...................................................................................................... 35

10.11.4 Procedure ...................................................................................................... 36

10.11.5 Requirements ................................................................................................ 36

10.11.6 Procedure 2 – Alternate method .................................................................... 36

10.12 Robustness of terminations test ............................................................................ 37

10.12.1 Purpose ......................................................................................................... 37

10.12.2 Procedure ...................................................................................................... 38

10.12.3 Requirements ................................................................................................ 38

10.13 Mechanical load test ............................................................................................. 38

10.13.1 Purpose ......................................................................................................... 38

10.13.2 Procedure ...................................................................................................... 39

10.13.3 Requirements ................................................................................................ 39

10.14 Off-axis beam damage test ................................................................................... 39

10.14.1 General ......................................................................................................... 39

10.14.2 Purpose ......................................................................................................... 39

10.14.3 Special case .................................................................................................. 39

10.14.4 Procedure ...................................................................................................... 40

10.14.5 Requirements ................................................................................................ 40

10.15 Outdoor exposure test .......................................................................................... 40

10.15.1 Purpose ......................................................................................................... 40

10.15.2 Procedure ...................................................................................................... 40

10.15.3 Requirements ................................................................................................ 41

10.16 Hot-spot endurance test ........................................................................................ 41

Annex A (informative) Summary of test conditions and requirements ................................... 42

Annex B (normative) Retesting guideline ............................................................................. 45

B.1 Product or process modifications requiring limited retesting to maintain

certification ........................................................................................................... 45

B.2 Modifications of CPV cell technology .................................................................... 45

B.3 Modifications in optical encapsulation on the cell (Includes optical coupling

between the cell and a glass secondary optical element bonded to the cell) .......... 46

B.4 Modification in cell encapsulation outside of intended light path ............................ 46

B.5 Modification of cell package substrate used for heat transfer ................................ 46

---------------------- Page: 5 ----------------------
– 4 – IEC 62108:2022 © IEC 2022

B.6 Accessible optics (primary or secondary) .............................................................. 47

B.7 Inaccessible optics (secondary) ............................................................................ 47

B.8 Frame and/or mounting structure .......................................................................... 47

B.9 Enclosure ............................................................................................................. 48

B.10 Wiring compartment/junction box .......................................................................... 48

B.11 Interconnection terminals ...................................................................................... 48

B.12 Interconnection materials or technique (to cells and between receivers) ............... 49

B.13 Change in electrical circuit design in an identical package .................................... 49

B.14 Output power ........................................................................................................ 49

B.15 Thermal energy transfer means ............................................................................ 50

B.16 Adhesives ............................................................................................................. 50

Figure 1 – Schematic of point-focus dish PV concentrator ..................................................... 14

Figure 2 – Schematic of linear-focus trough PV concentrator ................................................ 15

Figure 3 – Schematic of point-focus Fresnel lens PV concentrator ........................................ 16

Figure 4 – Schematic of linear-focus Fresnel lens PV concentrator ....................................... 17

Figure 5 – Schematic of a heliostat CPV ............................................................................... 18

Figure 6 – Qualification test sequence for CPV modules ....................................................... 19

Figure 7 – Qualification test sequence for CPV assemblies ................................................... 20

Figure 8 – Temperature and current profile of thermal cycle test (not to scale) ..................... 31

Figure 9 – Profile of humidity-freeze test conditions .............................................................. 33

Figure 10 – Bypass diode thermal test .................................................................................. 37

Table 1 – Terms used for CPV .............................................................................................. 10

Table 2 – Allocation of test samples to typical test sequences .............................................. 12

Table 3 – Thermal cycle test options for sequence A ............................................................ 29

Table 4 – Humidity freeze test options for sequence B .......................................................... 32

Table 5 – Minimum wind loads .............................................................................................. 38

Table A.1 – Summary of test conditions and requirements .................................................... 42

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IEC 62108:2022 © IEC 2022 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONCENTRATOR PHOTOVOLTAIC (CPV) MODULES AND ASSEMBLIES –
DESIGN QUALIFICATION AND TYPE APPROVAL
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 62108 has been prepared by IEC technical committee 82: Solar photovoltaic energy

systems. It is an International Standard.

This third edition cancels and replaces the second edition published in 2016. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) Changes in the procedure of the thermal cycling test for the active cooling module.

b) Solar simulator I-V measurement.
---------------------- Page: 7 ----------------------
– 6 – IEC 62108:2022 © IEC 2022
The text of this International Standard is based on the following documents:
Draft Report on voting
82/2024/FDIS 82/2046/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 8 ----------------------
IEC 62108:2022 © IEC 2022 – 7 –
CONCENTRATOR PHOTOVOLTAIC (CPV) MODULES AND ASSEMBLIES –
DESIGN QUALIFICATION AND TYPE APPROVAL
1 Scope

This document specifies the minimum requirements for the design qualification and type

approval of concentrator photovoltaic (CPV) modules and assemblies suitable for long-term

operation in general open-air climates as defined in IEC 60721-2-1. The test sequence is

partially based on that specified in IEC 61215-1 for the design qualification and type approval

of flat-plate terrestrial crystalline silicon PV modules. However, some changes have been made

to account for the special features of CPV receivers and modules, particularly with regard to

the separation of on-site and in-lab tests, effects of tracking alignment, high current density,

and rapid temperature changes, which have resulted in the formulation of some new test

procedures or new requirements.

The object of this test document is to determine the electrical, mechanical, and thermal

characteristics of the CPV modules and assemblies and to show, as far as possible within

reasonable constraints of cost and time, that the CPV modules and assemblies are capable of

withstanding prolonged exposure in climates described in the scope. The actual life of CPV

modules and assemblies so qualified will depend on their design, production, environment, and

the conditions under which they are operated.

This document is used in conjunction with the retest guidelines described in Annex B.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.
IEC 60529, Degrees of protection provided by enclosures (IP Code)

IEC 60664-1:2020, Insulation coordination for equipment within low-voltage supply systems –

Part 1: Principles, requirements and tests

IEC 60721-2-1, Classification of environmental conditions – Part 2-1: Environmental conditions

appearing in nature – Temperature and humidity

IEC 60904-1:2020, Photovoltaic devices – Part 1: Measurement of photovoltaic current-voltage

characteristics

IEC 60904-1-1:2017, Photovoltaic devices – Part 1-1: Measurement of current-voltage

characteristics of multi-junction photovoltaic (PV) devices

IEC TS 60904-1-2:2019, Photovoltaic devices – Part 1-2: Measurement of current-voltage

characteristics of bifacial photovoltaic (PV) devices

IEC 60904-2:2015, Photovoltaic devices – Part 2: Requirements for photovoltaic reference

devices

IEC 60904-3:2019, Photovoltaic devices – Part 3: Measurement principles for terrestrial

photovoltaic (PV) solar devices with reference spectral irradiance data
---------------------- Page: 9 ----------------------
– 8 – IEC 62108:2022 © IEC 2022

IEC 60904-4:2019, Photovoltaic devices – Part 4: Photovoltaic reference devices – Procedures

for establishing calibration traceability

IEC 60904-5:2011, Photovoltaic devices – Part 5: Determination of the equivalent cell

temperature (ECT) of photovoltaic (PV) devices by the open-circuit voltage method

IEC 60904-7:2019, Photovoltaic devices – Part 7: Computation of the spectral mismatch

correction for measurements of photovoltaic devices

IEC 60904-8:2014, Photovoltaic devices – Part 8: Measurement of spectral responsivity of a

photovoltaic (PV) device

IEC 60904-8-1:2017, Photovoltaic devices – Part 8-1: Measurement of spectral responsivity of

multi-junction photovoltaic (PV) devices

IEC 61140:2016, Protection against electric shock – Common aspects for installation and

equipment

IEC 61210:2010, Connecting devices – Flat quick-connect terminations for electrical copper

conductors – Safety requirements

IEC 61215-1:2021, Terrestrial photovoltaic (PV) modules – Design qualification and type

approval – Part 1: Test requirements

IEC 61215-2:2021, Terrestrial photovoltaic (PV) modules – Design qualification and type

approval – Part 2: Test pro
...

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