SIST EN 60904-5:2011/A1:2023

Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic (PV) devices by the open-circuit voltage method

This part of IEC 60904 describes the preferred method for determining the equivalent cell
temperature (ECT) of PV devices (cells, modules and arrays of one type of module), for the
purposes of comparing their thermal characteristics, determining NOCT (nominal operating cell
temperature) or alternatively NMOT (nominal module operating temperature), and translating
measured I-V characteristics to other temperatures.

Photovoltaische Einrichtungen - Teil 5: Bestimmung der gleichwertigen Zellentemperatur von photovoltaischen (PV) Betriebsmitteln nach dem Leerlaufspannungs-Verfahren

Dispositifs photovoltaïques - Partie 5: Détermination de la température de cellule équivalente (ECT) des dispositifs photovoltaïques (PV) par la méthode de la tension en circuit ouvert

Fotonapetostne naprave - 5. del: Določanje ekvivalentne temperature celice (ECT) fotonapetostnih (PV) naprav po metodi napetosti odprtih sponk (IEC 60904-5:2011)- Dopolnilo A1

General Information

• Status: Published
• Publication Date: 06-Apr-2023
• ICS: 27.160 - Solar energy engineering
• Technical Committee: PVS - Solar photovoltaic energy systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-Mar-2023
• Due Date: 03-Jun-2023
• Completion Date: 07-Apr-2023
• Ref Project: EN 60904-5:2011/A1:2022 - Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic (PV) devices by the open-circuit voltage method

Relations

• Amends: SIST EN 60904-5:2011 - Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic (PV) devices by the open-circuit voltage method
• Effective Date: 01-May-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60904-5:2011/A1:2023
01-maj-2023
Fotonapetostne naprave - 5. del: Določanje ekvivalentne temperature celice (ECT)
fotonapetostnih (PV) naprav po metodi napetosti odprtih sponk (IEC 60904-
5:2011)- Dopolnilo A1
Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of
photovoltaic (PV) devices by the open-circuit voltage method
Photovoltaische Einrichtungen - Teil 5: Bestimmung der gleichwertigen Zellentemperatur
von photovoltaischen (PV) Betriebsmitteln nach dem Leerlaufspannungs-Verfahren
Dispositifs photovoltaïques - Partie 5: Détermination de la température de cellule
équivalente (ECT) des dispositifs photovoltaïques (PV) par la méthode de la tension en
circuit ouvert
Ta slovenski standard je istoveten z: EN 60904-5:2011/A1:2022
ICS:
27.160 Sončna energija Solar energy engineering
SIST EN 60904-5:2011/A1:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60904-5:2011/A1:2023

---------------------- Page: 2 ----------------------
SIST EN 60904-5:2011/A1:2023


EUROPEAN STANDARD EN 60904-5:2011/A1

NORME EUROPÉENNE

EUROPÄISCHE NORM December 2022
ICS 27.160

English Version
Photovoltaic devices - Part 5: Determination of the equivalent
cell temperature (ECT) of photovoltaic (PV) devices by the open-
circuit voltage method
(IEC 60904-5:2011/AMD1:2022)
Dispositifs photovoltaïques - Partie 5: Détermination de la Photovoltaische Einrichtungen - Teil 5: Bestimmung der
température de cellule équivalente (ECT) des dispositifs gleichwertigen Zellentemperatur von photovoltaischen (PV)
photovoltaïques (PV) par la méthode de la tension en circuit Betriebsmitteln nach dem Leerlaufspannungs-Verfahren
ouvert (IEC 60904-5:2011/AMD1:2022)
(IEC 60904-5:2011/AMD1:2022)
This amendment A1 modifies the European Standard EN 60904-5:2011; it was approved by CENELEC on 2022-12-22. 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,
Türkiye 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 60904-5:2011/A1:2022 E

---------------------- Page: 3 ----------------------
SIST EN 60904-5:2011/A1:2023
EN 60904-5:2011/A1:2022 (E)
European foreword
The text of document 82/2069/FDIS, future IEC 60904-5/AMD1, prepared by IEC/TC 82 "Solar
photovoltaic energy systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 60904-5:2011/A1:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-09-22
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-12-22
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60904-5:2011/AMD1:2022 was approved by CENELEC as
a European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
ISO 7214 NOTE Harmonized as EN ISO 7214
2

---------------------- Page: 4 ----------------------
SIST EN 60904-5:2011/A1:2023
EN 60904-5:2011/A1:2022 (E)
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.
Add the following references:
Publication Year Title EN/HD Year
IEC/TS 60904-1-2 2019 Photovoltaic devices - Part 1-2: - -
Measurement of current-voltage
characteristics of bifacial photovoltaic (PV)
devices
IEC 60904-3 - Photovoltaic devices - Part 3: Measurement EN IEC 60904-3 -
principles for terrestrial photovoltaic (PV)
solar devices with reference spectral
irradiance data
Delete the following reference:
Publication Year Title EN/HD Year
ISO/IEC 17025 - General requirements for competence of - -
testing and calibration laboratories

3

---------------------- Page: 5 ----------------------
SIST EN 60904-5:2011/A1:2023

---------------------- Page: 6 ----------------------
SIST EN 60904-5:2011/A1:2023



IEC 60904-5

®


Edition 2.0 2022-11




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE




A MENDMENT 1

AM ENDEMENT 1





Photovoltaic devices –

Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic

(PV) devices by the open-circuit voltage method




Dispositifs photovoltaïques –

Partie 5: Détermination de la température de cellule équivalente (ECT) des


dispositifs photovoltaïques (PV) par la méthode de la tension en circuit ouvert













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 27.160 ISBN 978-2-8322-5728-9




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: 7 ----------------------
SIST EN 60904-5:2011/A1:2023
– 2 – IEC 60904-5:2011/AMD1:2022
© IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

PHOTOVOLTAIC DEVICES –

Part 5: Determination of the equivalent cell temperature (ECT) of
photovoltaic (PV) devices by the open-circuit voltage method

AMENDMENT 1

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,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 document may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 60904-5:2011 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
The text of this Amendment is based on the following documents:
Draft Report on voting
82/2069/FDIS 82/2082/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 Amendment is English.

---------------------- Page: 8 ----------------------
SIST EN 60904-5:2011/A1:2023
IEC 60904-5:2011/AMD1:2022 – 3 –
© IEC 2022
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.

___________

INTRODUCTION
Add the following new text:
For modules with large thermal inertia such as glass-glass construction for BIPV applications,
measurements become even more challenging with increased temperature difference between
the cell and module external temperatures during transient conditions. In addition, for bifacial
PV modules the temperature sensors may shade an active cell, potentially even creating local
hotspots where sensors are located on effective cell areas.
NOTE 1 NMOT is defined as the equilibrium mean solar cell junction temperature within an open-rack mounted
module operating near peak power, in the following standard reference environment:
– Tilt angle: (37 ± 5)°.
2
– Total irradiance: 800 W/m .
– Ambient temperature: 20 °C.
– Wind speed: 1 m/s.
– Electrical load: A resistive load sized such that the module will operate near its maximum power point at STC or
an
...