SIST EN 62788-1-4:2017/A1:2021

• Abstract:

  No scope available

• Status: Published
• Publication Date: 08-Dec-2020
• ICS: 17.180.99 - Other standards related to optics and optical measurements
• ICS: 27.160 - Solar energy engineering
• Technical Committee: PVS - Solar photovoltaic energy systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-Dec-2020
• Due Date: 12-Feb-2021
• Completion Date: 09-Dec-2020
• Ref Project: EN 62788-1-4:2016/A1:2020 - Measurement procedures for materials 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

• Amends: SIST EN 62788-1-4:2017 - Measurement procedures for materials 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 frequency
• Effective Date: 01-Jan-2021

Overview

SIST EN 62788-1-4:2017/A1:2021 is an essential European standard published by the Slovenian Institute for Standardization (SIST). It specifies measurement procedures for materials used in photovoltaic (PV) modules, focusing on encapsulants. This amendment outlines the processes for measuring optical transmittance and calculating key optical characteristics, including solar-weighted photon transmittance, yellowness index, and the ultraviolet (UV) cut-off wavelength. Accurate and consistent measurement of these parameters is critical for ensuring the efficiency, reliability, and longevity of solar photovoltaic modules.

This standard is directly aligned with EN 62788-1-4:2016/A1:2020 and IEC 62788-1-4:2016/AMD1:2020, maintaining a harmonized approach across Europe and internationally.

Key Topics

SIST EN 62788-1-4:2017/A1:2021 addresses several pivotal areas relevant to PV module manufacturing and testing:

• Optical Transmittance Measurement
  Procedures for quantifying how much light passes through encapsulant materials, which impact the energy conversion efficiency of PV modules.

• Solar-weighted Photon Transmittance
  Calculation methods to determine the transmittance weighted by the solar spectrum, offering a more realistic evaluation of module performance.

• Yellowness Index
  Methods for measuring and calculating the degree of yellowing in encapsulants, which is a critical indicator of material aging and weathering.

• UV Cut-off Wavelength
  Determination of the wavelength below which the encapsulant blocks ultraviolet light, influencing both PV module protection and performance.

• Specimen Conditioning and Preparation
  Requirements for conditioning specimens to ensure consistent and reliable measurements (e.g., controlled temperature and humidity).

• Witness Specimens for Instrument Verification
  Use of control samples (witness specimens) to ensure accurate instrument performance before and after testing.

Applications

The procedures and methodologies outlined in SIST EN 62788-1-4:2017/A1:2021 have practical value for a range of solar energy industry stakeholders:

• PV Module Manufacturers
  Ensuring encapsulant materials meet strict optical requirements for efficiency and durability before incorporation into commercial modules.

• Research and Development (R&D)
  Evaluating new encapsulant formulations or alternative materials for improved solar module performance.

• Quality Assurance and Control
  Routine verification of production batches to secure long-term reliability, reduce warranty claims, and maintain customer satisfaction.

• Testing Laboratories
  Providing standardized measurement protocols for third-party validation and certification of PV module components.

• Material Suppliers
  Certifying that supplied encapsulants maintain required light transmittance and UV-blocking properties over the expected lifetime of PV products.

Related Standards

For a holistic approach to photovoltaic module component assessment, consider the following related standards:

• IEC 62788-1-4:2016/A1:2020
  The base international standard harmonized in this European version.

• EN 61215 Series
  Standards for the design qualification and type approval of PV modules.

• EN 61730 Series
  Safety qualification standards for PV modules.

• ISO 291
  Reference for specimen conditioning in controlled environments.

• Other SIST EN 62788 Parts
  Covering additional measurement procedures for PV module materials, such as backsheets and frontsheets.

By adhering to SIST EN 62788-1-4:2017/A1:2021, organizations can demonstrate compliance with industry best practices in the measurement and control of critical optical properties in solar module encapsulants, ensuring consistent quality and performance in the rapidly evolving renewable energy sector.

SLOVENSKI STANDARD
01-januar-2021
Merilni postopki za materiale, uporabljene v fotonapetostnih modulih - 1-4. del:
Enkapsulanti - Meritev optične prosojnosti in izračun solarno utežene prosojnosti,
indeks porumenelosti in ultravijolične mejne frekvence - Dopolnilo A1
Measurement procedures for materials 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
Messverfahren für Werkstoffe, die in Photovoltaikmodulen verwendet werden - Teil 1-4:
Verkapselungsstoffe - Messung der optischen Transmission und Berechnung der
solargewichteten Photonentransmission, des Vergilbungsindex und der UV-
Grenzfrequenz
Amendement 1 - Procédures de mesure des matériaux utilisés dans les modules
photovoltaïques - Partie 1-4: Encapsulants - Mesurage du facteur de transmission
optique et calcul du facteur de transmission photonique à pondération solaire, de l'indice
de jaunissement et de la fréquence de coupure des UV
Ta slovenski standard je istoveten z: EN 62788-1-4:2016/A1:2020
ICS:
17.180.99 Drugi standardi v zvezi z Other standards related to
optiko in optičnimi merjenji optics and optical
measurements
27.160 Sončna energija Solar energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62788-1-4:2016/A1

NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 27.160
English Version
Measurement procedures for materials 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 62788-1-4:2016/A1:2020)
Procédures de mesure des matériaux utilisés dans les Messverfahren für Werkstoffe, die in Photovoltaikmodulen
modules photovoltaïques - Partie 1-4: Encapsulants - verwendet werden - Teil 1-4: Verkapselungsstoffe -
Mesurage du facteur de transmission optique et calcul du Messung der optischen Transmission und Berechnung der
facteur de transmission photonique à pondération solaire, solargewichteten Photonentransmission, des
de l'indice de jaunissement et de la fréquence de coupure Vergilbungsindex und der UV-Grenzfrequenz
des UV (IEC 62788-1-4:2016/A1:2020)
(IEC 62788-1-4:2016/A1:2020)
This amendment A1 modifies the European Standard EN 62788-1-4:2016; it was approved by CENELEC on 2020-11-19. CENELEC
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment 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 amendment 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 62788-1-4:2016/A1:2020 E

European foreword
The text of document 82/1767/FDIS, future IEC 62788-1-4/A1, prepared by IEC/TC 82 "Solar
photovoltaic energy systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 62788-1-4:2016/A1:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-08-19
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-11-19
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 62788-1-4:2016/A1:2020 was approved by CENELEC as a
European Standard without any modification.

IEC 62788-1-4 ®
Edition 1.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Measurement procedures for materials 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
Procédures de mesure des matériaux utilisés dans les modules
photovoltaïques –
Partie 1-4: Encapsulants – Mesurage du facteur de transmission optique
et calcul du facteur de transmission photonique à pondération solaire,
de l'indice de jaunissement et de la fréquence de coupure des UV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-8874-0
– 2 – IEC 62788-1-4:2016/AMD1:2020
© IEC 2020
FOREWORD
This amendment has been prepared by IEC technical committee 82: Solar photovoltaic energy
systems.
The text of this amendment is based on the following documents:
FDIS Report on voting
82/1767/FDIS 82/1791/RVD
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
1 Scope
In the second sentence of the second paragraph, replace:
around the edges
by:
at the periphery
4 Principle
In the last sentence, replace:
concentration
by:
optical concentration
IEC 62788-1-4:2016/AMD1:2020 – 3 –
© IEC 2020
6.1 Nominal (and unweathered) transmittance to the cell
In the fifth paragraph, replace:
The nominal thickness of the enca
...