EN 60904-5:2011
(Main)Photovoltaic devices - Part 5: Determination of the equivalent cell temperature (ECT) of photovoltaic (PV) devices by the open-circuit voltage method
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 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) and translating measured I-V characteristics to other temperatures. The main technical changes with regard to the previous edition are as follows: - added method on how to extract the input parameters; - rewritten method on how to calculate ECT; - reworked formulae to be in line with IEC 60891.
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
La CEI 60904-5:2011 décrit la méthode préférentielle pour déterminer la température de cellule équivalente (ECT) des dispositifs photovoltaïques (cellules, modules et champs d'un type de module), dans les buts de comparer leurs caractéristiques thermiques, de déterminer leur NOCT (température nominale d'utilisation des cellules) et de transposer les caractéristiques I-V mesurées à d'autres températures que celles de leur mesure. Les principaux changements techniques par rapport à l'édition précédente sont les suivants: - ajout d'une méthode explicitant comment extraire les paramètres d'entrée; - réécriture de la méthode explicitant comment calculer ECT; - travail sur les formules pour qu'elles soient cohérentes avec la CEI 60891.
Fotonapetostne naprave - 5. del: Določanje ekvivalentne temperature celice (ECT) fotonapetostnih (PV) naprav po metodi napetosti odprtih sponk (IEC 60904-5:2011)
Ta del IEC 60904 opisuje prednostno metodo za določanje ekvivalentne temperature celic (ECT) fotonapetostnih (PV) naprav (celic, modulov in nizov modulov ene vrste) za namen primerjave njihovih termičnih značilnosti, ugotavljanje NOCT (nazivne delovne temperature celic) in prevajanje izmerjenih značilnosti I-V v druge temperature.
Ta standard velja za linerane naprave z logaritemsko odvisnostjo VOC od sevanja in za stabilne pogoje. Lahko se uporablja pri vseh tehnologijah, vendar je treba preveriti, da ni učinka kondicioniranja, ki bi vplival na meritev.
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2011
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SIST EN 60904-5:2001
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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
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 60904-5
NORME EUROPÉENNE
April 2011
EUROPÄISCHE NORM
ICS 27.160 Supersedes EN 60904-5:1995
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)
Dispositifs photovoltaïques - Photovoltaische Einrichtungen -
Partie 5: Détermination de la température Teil 5: Bestimmung der gleichwertigen
de cellule équivalente (ECT) des Zellentemperatur von photovoltaischen
dispositifs photovoltaïques (PV) par la (PV) Betriebsmitteln nach dem
méthode de la tension en circuit ouvert Leerlaufspannungs-Verfahren
(CEI 60904-5:2011) (IEC 60904-5:2011)
This European Standard was approved by CENELEC on 2011-03-24. 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 Central Secretariat 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 Central Secretariat 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, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60904-5:2011 E
Foreword
The text of document 82/595/CDV, future edition 2 of IEC 60904-5, prepared by IEC TC 82, Solar
photovoltaic energy systems, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60904-5 on 2011-03-24.
This European Standard supersedes EN 60904-5:1995.
The main technical changes with regard to EN 60904-5:1995 are as follows:
— added and updated normative references;
— added reporting section;
— added method on how to extract the input parameters;
— rewritten method on how to calculate ECT;
— reworked formulae to be in line with EN 60891.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-12-24
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-03-24
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60904-5:2011 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60904-5:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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 When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60891 - Photovoltaic devices - Procedures for EN 60891 -
temperature and irradiance corrections to
measured I-V characteristics
IEC 60904-1 - Photovoltaic devices - EN 60904-1 -
Part 1: Measurement of photovoltaic current-
voltage characteristics
IEC 60904-2 - Photovoltaic devices - EN 60904-2 -
Part 2: Requirements for reference solar
devices
IEC 60904-7 - Photovoltaic devices - EN 60904-7 -
Part 7: Computation of the spectral mismatch
correction for measurements of photovoltaic
devices
IEC 60904-10 - Photovoltaic devices - EN 60904-10 -
Part 10: Methods of linearity measurement
IEC 61215 - Crystalline silicon terrestrial photovoltaic EN 61215 -
(PV) modules - Design qualification and type
approval
IEC 61829 - Crystalline silicon photovoltaic (PV) array - EN 61829 -
On-site measurement of I-V characteristics
ISO/IEC 17025 - General requirements for the competence EN ISO/IEC 17025 -
of testing and calibration laboratories
IEC 60904-5 ®
Edition 2.0 2011-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
PRICE CODE
INTERNATIONALE
CODE PRIX K
ICS 27.160 ISBN 978-2-88912-366-7
– 2 – 60904-5 IEC:2011
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope and object . 6
2 Normative references . 6
3 Measurement principle and requirements . 6
3.1 Principle . 6
3.2 General measurement requirements . 7
4 Apparatus . 7
5 Determination of required input parameters . 7
6 Procedure . 8
6.1 General . 8
6.2 Operating in a controlled environment . 8
6.3 Taking measurements under arbitrary irradiance conditions . 8
7 Calculation of equivalent cell temperature . 8
8 Test report. 9
60904-5 IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PHOTOVOLTAIC DEVICES –
Part 5: Determination of the equivalent cell temperature (ECT)
of photovoltaic (PV) devices by the open-circuit voltage method
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
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in the subject dealt with may participate in this preparatory work. International, governmental and non-
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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
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6) All users should ensure that they have the latest edition of this publication.
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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 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 60904-5 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
This second edition cancels and replaces the first edition, issued in 1993, and constitutes a
technical revision.
The main technical changes with regard to the previous edition are as follows:
• added and updated normative references;
• added reporting section;
• added method on how to extract the input parameters;
• rewritten method on how to calculate ECT;
• reworked formulae to be in line with IEC 60891.
– 4 – 60904-5 IEC:2011
The text of this standard is based on the following documents:
CDV Report on voting
82/595/CDV 82/626/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
A list of all parts of IEC 60904 series, under the general title Photovoltaic devices, can be
found on the IEC website.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site 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.
60904-5 IEC:2011 – 5 –
INTRODUCTION
When temperature sensors, such as thermocouples, are used to determine the cell
temperature of PV devices under natural or simulated steady-state irradiance, two main
problems arise. First, a considerable spread of temperature can be observed over the area of
the module. Second, as the solar cells are usually not accessible, sensors are attached to the
back of the module and the measured temperature thus is influenced by the thermal
conductivity of the encapsulant and back materials. These problems are aggr
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