EN IEC 62788-1-7:2020

SLOVENSKI STANDARD
01-september-2020
Merilni postopki za materiale, uporabljene v fotonapetostnih modulih - 1-7. del:
Enkapsulanti - Preskusni postopki za optično trajnost
Measurement procedures for materials used in photovoltaic modules - Part 1-7:
Encapsulants - Test procedure of optical durability
Messverfahren für Werkstoffe, die in Photovoltaik-Modulen verwendet werden - Teil 1-7:
Verkapselungsstoffe - Testverfahren der optischen Beständigkeit
Procédures de mesure des matériaux utilisés dans les modules photovoltaïques - Part 1-
7: Encapsulants - Procédure d’essai de la durabilité optique
Ta slovenski standard je istoveten z: EN IEC 62788-1-7:2020
ICS:
27.160 Sončna energija Solar energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62788-1-7

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2020
ICS 27.160
English Version
Measurement procedures for materials used in photovoltaic
modules - Part 1-7: Encapsulants - Test procedure of optical
durability
(IEC 62788-1-7:2020)
Procédures de mesure des matériaux utilisés dans les To be completed
modules photovoltaïques - Part 1-7: Encapsulants - (IEC 62788-1-7:2020)
Procédure d'essai de la durabilité optique
(IEC 62788-1-7:2020)
This European Standard was approved by CENELEC on 2020-05-26. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62788-1-7:2020 E

European foreword
The text of document 82/1669/FDIS, future edition 1 of IEC 62788-1-7, prepared by IEC/TC 82 "Solar
photovoltaic energy systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62788-1-7:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-02-26
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-05-26
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62788-1-7:2020 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60904-3 NOTE Harmonized as EN IEC 60904-3
IEC 61730-2 NOTE Harmonized as EN IEC 61730-2
IEC 62788-2 (series) NOTE Harmonized as EN IEC 62788-2 (series)

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61215-2 - Terrestrial photovoltaic (PV) modules - EN 61215-2 -
Design qualification and type approval -
Part 2: Test procedures
IEC 61730-1 - Photovoltaic (PV) module safety EN IEC 61730-1 -
qualification - Part 1: Requirements for
construction
IEC/TS 61836 - Solar photovoltaic energy systems - - -
Terms, definitions and symbols
IEC 62788-1-4 - Measurement procedures for materials EN 62788-1-4 -
used in photovoltaic modules - Part 1-4:
Encapsulants - Measurement of optical
transmittance and calculation of the solar-
weighted photon transmittance,
yellowness index, and UV cut-off
wavelength
IEC/TS 62788-7-2 - Measurement procedures for materials - -
used in photovoltaic modules - Part 7-2:
Environmental exposures - Accelerated
weathering tests of polymeric materials
IEC/TS 62915 - Photovoltaic (PV) modules - Type - -
approval, design and safety qualification -
Retesting
IEC/TS 63126 - Guidelines for qualifying PV modules, - -
components, and materials for operation
at high temperatures
Under preparation. Stage at the time of publication: IEC/DTS 63126:2019.
ISO 291 - Plastics - Standard atmospheres for EN ISO 291 -
conditioning and testing
ASTM G7 - Standard practice for atmospheric - -
environmental exposure testing of
nonmetallic materials
IEC 62788-1-7 ®
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Measurement procedures for materials used in photovoltaic modules –

Part 1-7: Encapsulants – Test procedure of optical durability

Procédures de mesure des matériaux utilisés dans les modules

photovoltaïques –
Partie 1-7: Encapsulants – Procédure d’essai de la durabilité optique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-8035-5

– 2 – IEC 62788-1-7:2020 © IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Principle . 7
5 Apparatus . 7
5.1 Spectrophotometer for transmittance measurements . 7
5.2 Environmental chamber for weathering . 7
6 Test specimens . 8
6.1 Specimen components and general considerations for all material types . 8
6.2 Test specimens for datasheet reporting . 8
6.3 Use of alternate superstrate and substrate materials . 8
6.4 Witness specimens and experimental control . 9
7 Measurement procedure . 9
8 Artificial accelerated weathering . 9
9 Calculation and expression of results . 9
10 Test procedure . 10
11 Pass/fail criteria . 10
12 Test report . 11
Bibliography . 13

IEC 62788-1-7:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEASUREMENT PROCEDURES FOR
MATERIALS USED IN PHOTOVOLTAIC MODULES –

Part 1-7: Encapsulants –
Test procedure of optical durability

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
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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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.
International Standard IEC 62788-1-7 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
The text of this International Standard is based on the following documents:
FDIS Report on voting
82/1669/FDIS 82/1704/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 62788 series, published under the general title Measurement
procedures for materials used in photovoltaic modules, can be found on the IEC website.

– 4 – IEC 62788-1-7:2020 © IEC 2020
The committee has decided that the contents of this document will remain unchanged until the
stability date indic
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