Terrestrial photovoltaic (PV) modules - Design qualification and type approval - Part 2: Test procedures

IEC 61215-2:2021 is available as IEC 61215-2:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61215-2:2021 lays down requirements for the design qualification of terrestrial photovoltaic modules suitable for long-term operation in open-air climates. This document is intended to apply to all terrestrial flat plate module materials such as crystalline silicon module types as well as thin-film modules. The objective of this test sequence is to determine the electrical characteristics of the module and to show, as far as possible within reasonable constraints of cost and time, that the module is capable of withstanding prolonged exposure outdoors. This second edition of IEC 61215-2 cancels and replaces the first edition of IEC 61215-2 issued in 2016. This edition includes the following significant technical changes with respect to the previous edition:
a. Addition of cyclic (dynamic) mechanical load testing (MQT 20).
b. Addition of a test for detection of potential-induced degradation (MQT 21).
c. Addition of test methods required for bifacial PV modules.
d. Addition of test methods required for flexible modules. This includes the addition of the bending test (MQT 22).
e. Revision of simulator requirements to ensure uncertainty is both well-defined and minimized.
f. Correction to the hot spot endurance test, where the procedure for monolithically integrated (MLI) thin film technologies (MQT 09.2) previously included two sections describing a procedure only appropriate for silicon modules.
g. Selection of three diodes, rather than all, for testing in the bypass diode thermal test (MQT 18).
h. Removal of the nominal module operating test (NMOT), and associated test of performance at NMOT, from the IEC 61215 series.

Modules photovoltaïques (PV) pour applications terrestres - Qualification de la conception et homologation - Partie 2: Procédures d'essai

IEC 61215-2:2021 est disponible sous forme de IEC 61215-2:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 61215-2:2021 établit les exigences concernant la qualification de conception des modules photovoltaïques terrestres appropriés à un fonctionnement de longue durée dans des climats à l’air libre. Le présent document est destiné à s'appliquer à tous les matériaux de modules à plaque plane pour applications terrestres, tels que les types de modules au silicium cristallin et les modules à couches minces. L'objet de cette séquence d'essais est de déterminer les caractéristiques électriques du module et d’indiquer, dans la mesure du possible avec des contraintes de coût et de temps raisonnables, que le module est capable de supporter une exposition prolongée en site naturel. Cette deuxième édition de l’IEC 61215-2 annule et remplace la première édition de l’IEC 61215‑2 parue en 2016. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente.
a. Ajout de l’essai de charge mécanique cyclique (dynamique) (MQT 20 - Module Quality Test, essai de qualité du module).
b. Ajout d’un essai de détection de la dégradation induite par le potentiel (MQT 21).
c. Ajout de méthodes d’essai exigées pour les modules PV bifaces.
d. Ajout de méthodes d’essai exigées pour les modules flexibles. Cette disposition inclut l’ajout de l’essai de flexion (MQT 22).
e. Révision des exigences du simulateur pour assurer à la fois la définition appropriée et la réduction le plus possible de l’incertitude.
f. Correction de l’essai de tenue à l’échauffement localisé, dont la procédure pour les technologies à couches minces à intégration monolithique (MLI - monolithic integration) (MQT 09.2) comprenait précédemment deux sections décrivant une méthode uniquement adaptée aux modules en silicium.
g. Choix de trois diodes, plutôt que de toutes les diodes d’essai, pour l’essai thermique de la diode de dérivation (MQT 18).
h. Suppression de l’essai nominal de fonctionnement du module (NMOT - nominal module operating test), et de l’essai associé de performances à la température nominale de fonctionnement du module (NMOT - nominal module operating temperature), issus de la série IEC 61215.

General Information

Status
Published
Publication Date
23-Feb-2021
Current Stage
PPUB - Publication issued
Completion Date
24-Feb-2021
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IEC 61215-2
Edition 2.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Terrestrial photovoltaic (PV) modules – Design qualification and type approval –
Part 2: Test procedures
Modules photovoltaïques (PV) pour applications terrestres – Qualification de la
conception et homologation –
Partie 2: Procédures d'essai
IEC 61215-2:2021-02(en-fr)
---------------------- Page: 1 ----------------------
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IEC 61215-2
Edition 2.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Terrestrial photovoltaic (PV) modules – Design qualification and type approval –
Part 2: Test procedures
Modules photovoltaïques (PV) pour applications terrestres – Qualification de la
conception et homologation –
Partie 2: Procédures d'essai
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-9394-2

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® Registered trademark of the International Electrotechnical Commission
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---------------------- Page: 3 ----------------------
– 2 – IEC 61215-2:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 6

INTRODUCTION ..................................................................................................................... 8

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms and definitions .................................................................................................... 11

4 Test procedures ............................................................................................................ 12

4.1 Visual inspection (MQT 01) ................................................................................... 12

4.1.1 Purpose ......................................................................................................... 12

4.1.2 Procedure ...................................................................................................... 12

4.1.3 Requirements ................................................................................................ 12

4.2 Maximum power determination (MQT 02) .............................................................. 12

4.2.1 Purpose ......................................................................................................... 12

4.2.2 Apparatus ...................................................................................................... 12

4.2.3 Procedure ...................................................................................................... 13

4.3 Insulation test (MQT 03) ....................................................................................... 13

4.3.1 Purpose ......................................................................................................... 13

4.3.2 Apparatus ...................................................................................................... 14

4.3.3 Test conditions .............................................................................................. 14

4.3.4 Procedure ...................................................................................................... 14

4.3.5 Test requirements .......................................................................................... 15

4.4 Measurement of temperature coefficients (MQT 04) .............................................. 15

4.5 Placeholder section, formerly NMOT ..................................................................... 15

4.6 Performance at STC (MQT 06.1) ........................................................................... 15

4.6.1 Purpose ......................................................................................................... 15

4.6.2 Apparatus ...................................................................................................... 15

4.6.3 Procedure for measuring at STC (MQT 06.1) ................................................. 16

4.7 Performance at low irradiance (MQT 07) ............................................................... 16

4.7.1 Purpose ......................................................................................................... 16

4.7.2 Apparatus ...................................................................................................... 16

4.7.3 Procedure ...................................................................................................... 17

4.8 Outdoor exposure test (MQT 08) ........................................................................... 17

4.8.1 Purpose ......................................................................................................... 17

4.8.2 Apparatus ...................................................................................................... 17

4.8.3 Procedure ...................................................................................................... 17

4.8.4 Final measurements ...................................................................................... 18

4.8.5 Requirements ................................................................................................ 18

4.9 Hot-spot endurance test (MQT 09) ........................................................................ 18

4.9.1 Purpose ......................................................................................................... 18

4.9.2 Hot-spot effect ............................................................................................... 18

4.9.3 Classification of cell interconnection .............................................................. 19

4.9.4 Apparatus ...................................................................................................... 20

4.9.5 Procedure ...................................................................................................... 21

4.9.6 Final measurements ...................................................................................... 28

4.9.7 Requirements ................................................................................................ 28

4.10 UV preconditioning test (MQT 10) ......................................................................... 28

4.10.1 Purpose ......................................................................................................... 28

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IEC 61215-2:2021 © IEC 2021 – 3 –

4.10.2 Apparatus ...................................................................................................... 28

4.10.3 Procedure ...................................................................................................... 29

4.10.4 Final measurements ...................................................................................... 29

4.10.5 Requirements ................................................................................................ 29

4.11 Thermal cycling test (MQT 11) .............................................................................. 29

4.11.1 Purpose ......................................................................................................... 29

4.11.2 Apparatus ...................................................................................................... 29

4.11.3 Procedure ...................................................................................................... 30

4.11.4 Final measurements ...................................................................................... 31

4.11.5 Requirements ................................................................................................ 31

4.12 Humidity-freeze test (MQT 12) .............................................................................. 32

4.12.1 Purpose ......................................................................................................... 32

4.12.2 Apparatus ...................................................................................................... 32

4.12.3 Procedure ...................................................................................................... 32

4.12.4 Final measurements ...................................................................................... 32

4.12.5 Requirements ................................................................................................ 32

4.13 Damp heat test (MQT 13) ...................................................................................... 33

4.13.1 Purpose ......................................................................................................... 33

4.13.2 Apparatus ...................................................................................................... 33

4.13.3 Procedure ...................................................................................................... 33

4.13.4 Final measurements ...................................................................................... 34

4.13.5 Requirements ................................................................................................ 34

4.14 Robustness of terminations (MQT 14) ................................................................... 34

4.14.1 Purpose ......................................................................................................... 34

4.14.2 Retention of junction box on mounting surface (MQT 14.1) ............................ 34

4.14.3 Test of cord anchorage (MQT 14.2) ............................................................... 34

4.15 Wet leakage current test (MQT 15) ....................................................................... 35

4.15.1 Purpose ......................................................................................................... 35

4.15.2 Apparatus ...................................................................................................... 35

4.15.3 Procedure ...................................................................................................... 35

4.15.4 Requirements ................................................................................................ 35

4.16 Static mechanical load test (MQT 16) .................................................................... 36

4.16.1 Purpose ......................................................................................................... 36

4.16.2 Apparatus ...................................................................................................... 36

4.16.3 Procedure ...................................................................................................... 37

4.16.4 Final measurements ...................................................................................... 37

4.16.5 Requirements ................................................................................................ 37

4.17 Hail test (MQT 17) ................................................................................................ 37

4.17.1 Purpose ......................................................................................................... 37

4.17.2 Apparatus ...................................................................................................... 37

4.17.3 Procedure ...................................................................................................... 38

4.17.4 Final measurements ...................................................................................... 39

4.17.5 Requirements ................................................................................................ 39

4.18 Bypass diode testing (MQT 18) ............................................................................. 40

4.18.1 Bypass diode thermal test (MQT 18.1) ........................................................... 40

4.18.2 Bypass diode functionality test (MQT 18.2) .................................................... 43

4.19 Stabilization (MQT 19) .......................................................................................... 44

4.19.1 General ......................................................................................................... 44

4.19.2 Criterion definition for stabilization ................................................................. 44

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– 4 – IEC 61215-2:2021 © IEC 2021

4.19.3 Light induced stabilization procedures ........................................................... 45

4.19.4 Other stabilization procedures ....................................................................... 46

4.19.5 Initial stabilization (MQT 19.1) ....................................................................... 46

4.19.6 Final stabilization (MQT 19.2) ........................................................................ 46

4.19.7 Stress-specific stabilization – BO LID (MQT 19.3).......................................... 47

4.20 Cyclic (dynamic) mechanical load test (MQT 20) ................................................... 47

4.20.1 Purpose ......................................................................................................... 47

4.20.2 Procedure ...................................................................................................... 47

4.20.3 Final measurements ...................................................................................... 47

4.20.4 Requirements ................................................................................................ 48

4.21 Potential induced degradation test (MQT 21) ........................................................ 48

4.21.1 Purpose ......................................................................................................... 48

4.21.2 Samples ........................................................................................................ 48

4.21.3 Apparatus ...................................................................................................... 48

4.21.4 Procedure ...................................................................................................... 48

4.21.5 Final measurements ...................................................................................... 48

4.21.6 Requirements ................................................................................................ 49

4.22 Bending test (MQT 22) .......................................................................................... 49

4.22.1 Purpose ......................................................................................................... 49

4.22.2 Apparatus ...................................................................................................... 49

4.22.3 Procedure ...................................................................................................... 49

4.22.4 Final measurements ...................................................................................... 49

4.22.5 Requirements ................................................................................................ 49

Annex A (informative) Recommended setup for managing weights during mechanical

loading (MQT 16) .................................................................................................................. 50

Bibliography .......................................................................................................................... 54

Figure 1 – Case S, series connection with optional bypass diode .......................................... 19

Figure 2 – Case PS, parallel-series connection with optional bypass diode ........................... 19

Figure 3 – Case SP, series-parallel connection with optional bypass diode ........................... 20

Figure 4 – Module I-V characteristics with different cells totally shadowed ............................ 21

Figure 5 – Module I-V characteristics with the test cell shadowed at different levels ............. 23

Figure 6 – Hot-spot effect in a MLI thin-film module with serially connected cells .................. 24

Figure 7 – Thermal cycling test – Temperature and applied current profile ............................ 30

Figure 8 – Proper attachment of 5 N weight to junction box for module utilizing a)

electrical termination leads, b) or wire for attachment, and c) only one junction box .............. 31

Figure 9 – Humidity-freeze cycle – Temperature and humidity profile .................................... 33

Figure 10 – Hail-test equipment ............................................................................................ 38

Figure 11 – Hail test impact locations: top for wafer/cell based technologies, bottom for

monolithic processed thin film technologies .......................................................................... 40

Figure 12 – Bypass diode thermal test .................................................................................. 42

Figure A.1 – 3D view (at left of figure), end view (at top right), and side view (at bottom

right) of gantry crane over mounting jig and loading jig ......................................................... 50

Figure A.2 – 3D close up views of mounting jig (right) and loading jig (left) ........................... 51

Figure A.3 – 2D view of mounting jig and loading jig ............................................................. 52

Figure A.4 – 3D view of loading jig ........................................................................................ 52

Figure A.5 – Close-up view of loading jig .............................................................................. 53

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IEC 61215-2:2021 © IEC 2021 – 5 –

Table 1 – Voltage stress levels ............................................................................................. 14

Table 2 – Ice-ball masses and test velocities ........................................................................ 38

Table 3 – Impact locations .................................................................................................... 39

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– 6 – IEC 61215-2:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TERRESTRIAL PHOTOVOLTAIC (PV) MODULES –
DESIGN QUALIFICATION AND TYPE APPROVAL –
Part 2: Test procedures
FOREWORD

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International Standard IEC 61215-2 has been prepared by IEC technical committee 82: Solar

photovoltaic energy systems.

This second edition of IEC 61215-2 cancels and replaces the first edition of IEC 61215-2 issued

in 2016; it constitutes a technical revision.

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

edition:
a) Addition of cyclic (dynamic) mechanical load testing (MQT 20).
b) Addition of a test for detection of potential-induced degradation (MQT 21).
c) Addition of test methods required for bifacial PV modules.

d) Addition of test methods required for flexible modules. This includes the addition of the

bending test (MQT 22).

e) Revision of simulator requirements to ensure uncertainty is both well-defined and minimized.

---------------------- Page: 8 ----------------------
IEC 61215-2:2021 © IEC 2021 – 7 –

f) Correction to the hot spot endurance test, where the procedure for monolithically integrated

(MLI) thin film technologies (MQT 09.2) previously included two sections describing a

procedure only appropriate for silicon modules.

g) Selection of three diodes, rather than all, for testing in the bypass diode thermal test

(MQT 18).

h) Removal of the nominal module operating test (NMOT), and associated test of performance

at NMOT, from the IEC 61215 series.

Informative Annex A of IEC 61215-1:2021 explains the background and reasoning behind some

of the more substantial changes that were made in the IEC 61215 series in progressing from

edition 1 to edition 2.
The text of this standard is based on the following documents:
FDIS Report on voting
82/1829/FDIS 82/1853/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61215 series, published under the general title Terrestrial

photovoltaic (PV) modules – Design qualification and type approval, can be found on the IEC

website.

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

stability date indicated on the IEC website under "http://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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it

ding of its
contains colours which are considered to be useful for the correct understan
contents. Users should therefore print this document using a colour printer.
---------------------- Page: 9 ----------------------
– 8 – IEC 61215-2:2021 © IEC 2021
INTRODUCTION

Whereas Part 1 of this standards series describes requirements (both in general and specifi

...

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