EN 62805-2:2017

SLOVENSKI STANDARD
01-januar-2018
Metode za merjenje fotonapetostnega (PV) stekla - 2. del: Merjenje transmitance in
reflektance
Method for measuring photovoltaic (PV) glass - Part 2: Measurement of transmittance
and reflectance
Ta slovenski standard je istoveten z: EN 62805-2:2017
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62805-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2017
ICS 27.160
English Version
Method for measuring photovoltaic (PV) glass - Part 2:
Measurement of transmittance and reflectance
(IEC 62805-2:2017)
Méthode de mesure du verre photovoltaïque (PV) - Partie 2: Verfahren für die Messung von photovoltaischem (PV) Glas
Mesurage du facteur de transmission et du facteur de - Teil 2: Messung von Transmissionsgrad und
réflexion Reflexionsgrad
(IEC 62805-2:2017) (IEC 62805-2:2017)
This European Standard was approved by CENELEC on 2017-09-21. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62805-2:2017 E
European foreword
The text of document 82/1298/FDIS, future edition 1 of IEC 62805-2, prepared by IEC/TC 82 “Solar
photovoltaic energy systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 62805-2:2017.
The following dates are fixed:
(dop) 2018-06-21
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2020-09-21
standards conflicting with the
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 62805-2:2017 was approved by CENELEC as a European
Standard without any modification.
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 When 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 60904-3 2016 Photovoltaic devices - Part 3: EN 60904-3 2016
Measurement principles for terrestrial
photovoltaic (PV) solar devices with
reference spectral irradiance data
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 frequency
IEC 62805-1 2017 Method for measuring photovoltaic (PV) EN 62805-1 2017
glass - Part 1: Measurement of total haze
and spectral distribution of haze
ISO 9050 -  Glass in building_- Determination of light - -
transmittance, solar direct transmittance,
total solar energy transmittance, ultraviolet
transmittance and related glazing factors

IEC 62805-2 ®
Edition 1.0 2017-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Method for measuring photovoltaic (PV) glass –

Part 2: Measurement of transmittance and reflectance

Méthode de mesure du verre photovoltaïque (PV) –

Partie 2: Mesurage du facteur de transmission et du facteur de réflexion

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-4721-1

– 2 – IEC 62805-2:2017 © IEC 2017
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Apparatus . 7
4.1 General . 7
4.2 Performance of test instrument . 7
5 Test specimens and reference standards . 7
5.1 Test specimens . 7
5.2 Reference standard . 7
6 Conditioning . 7
7 Procedure . 8
7.1 General . 8
7.2 Measurement of spectral hemispherical transmittance . 8
7.2.1 Instrument calibration . 8
7.2.2 Sample measurement . 8
7.3 Measurement of spectral hemispherical reflectance . 8
7.3.1 Instrument calibration . 8
7.3.2 Sample measurement . 9
8 Calculation and expression of results . 10
8.1 Effective hemispherical transmittance of photon irradiance . 10
8.2 Effective hemispherical reflectance of photon irradiance . 10
9 Test report . 11
Bibliography . 12

Figure 1 – Schematic of the integrating sphere for reflectance measurement . 9

IEC 62805-2:2017 © IEC 2017 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METHOD FOR MEASURING PHOTOVOLTAIC (PV) GLASS –

Part 2: Measurement of transmittance and reflectance

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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
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6) All users should ensure that they have the latest edition of this publication.
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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 62805-2 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
The text of this standard is based on the following documents:
FDIS Report on voting
82/1298/FDIS 82/1322/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 62805, published under the general title Method for measuring
photovoltaic (PV) glass, can be found on the IEC website.

– 4 – IEC 62805-2:2017 © IEC 2017
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.
IEC 62805-2:2017 © IEC 2017 – 5 –
INTRODUCTION
This document differentiates from the other standards related to transmittance and reflectance
test as follows:
• the scope of this document is restricted to transmittance and reflectance measurement for
PV glass,
• the wavelength range is typically from 280 nm to 1 250 nm which is related to the spectral
response of common solar cells,
• in order to harmonize the calculation of the transmittance and reflectance of PV glass, the
photon irradiance was used instead of the spectral solar irradiance,
• apparatus conditions such as the integrating sphere type and diameter are specified.
This part of IEC 62805 establishes IEC requirements for providing procedures and calculation
methods for measuring the transmittance and reflectance of glass used in photovoltaic (PV)
modules.
Types of PV glass include ultra-clear patterned glass, anti-reflective coated glass, transparent
conductive oxide (TCO) glass and other kind of glass used in PV modules. With the rapid
growth of the global PV industry, the amount of PV glass being used has increased
tremendously. The optical properties including t
...