SIST EN 60904-7:2009

Photovoltaic devices -- Part 7: Computation of the spectral mismatch correction for measurements of photovoltaic devices

This part of IEC 60904 describes the procedure for correcting the bias error introduced in the testing of a photovoltaic device, caused by the mismatch between the test spectrum and the reference spectrum and by the mismatch between the spectral responses (SR) of the reference cell and of the test specimen. The procedure applies only to photovoltaic devices linear in SR as defined in IEC 60904-10. This procedure is valid for single junction devices but the principle may be extended to cover multijunction devices. The purpose of this standard is to give guidelines for the correction of measurement bias, should there be a mismatch between both the test spectrum and the reference spectrum and between the reference device SR and the test specimen SR. Since a PV device has a wavelength-dependent response, its performance is significantly affected by the spectral distribution of the incident radiation, which in natural sunlight varies with several factors such as location, weather, time of year, time of day, orientation of the receiving surface, etc., and with a simulator varies with its type and conditions. If the irradiance is measured with a thermopile-type radiometer (that is not spectrally selective) or with a reference solar cell, the spectral irradiance distribution of the incoming light must be known to make the necessary corrections to obtain the performance of the PV device under the reference solar spectral distribution defined in IEC 60904-3. If a reference PV device or a thermopile type detector is used to measure the irradiance then, following the procedure given in this standard, it is possible to calculate the spectral mismatch correction necessary to obtain the short-circuit current of the test PV device under the reference solar spectral irradiance distribution included in Table 1 of IEC 60904-3 or any other reference spectrum. If the reference PV device has the same relative spectral response as the test PV device then the reference device automatically takes into account deviations of the real light spectral distribution from the standard spectral distribution, and no further correction of spectral bias errors is necessary. In this case, location and weather conditions are not critical when the reference device method is used for outdoor performance measurements provided both reference cell and test PV device have the same relative spectral response. Also, for identical relative SR's, the spectral classification of the simulator is not critical for indoor measurements. If the performance of a PV device is measured using a known spectral irradiance distribution, its short-circuit current at any other spectral irradiance distribution can be computed using the spectral response of the PV test device.

Photovoltaische Einrichtungen - Teil 7: Berechnung der spektralen Fehlanpassungskorrektion für Messungen an photovoltaischen Einrichtungen

Dispositifs photovoltaïques -- Partie 7: Calcul de la correction de désadaptation des réponses spectrales dans les mesures de dispositifs photovoltaïques

La CEI 60904-7:2008 décrit la procédure pour corriger l'erreur de justesse de mesure introduite dans l'essai d'un dispositif photovoltaïque, due d'une part à la désadaptation du spectre pour l'essai et du spectre de référence, et d'autre part à la désadaptation entre les réponses spectrales de la cellule de référence et du spécimen en essai. La procédure s'applique seulement aux dispositifs photovoltaïques linéaires en réponses spectrales tels que définis dans la CEI 60904-10. Cette procédure est valable pour les dispositifs à jonction unique mais le principe peut être étendu aux dispositifs à multi-jonctions. Cette nouvelle édition contient les différences suivantes par rapport à l'édition précédente: une description indiquant quand il faut utiliser la méthode et quand elle n'est pas nécessaire; ajout de nouveaux paragraphes.

Fotonapetostne naprave - 7. del: Izračunavanje napake zaradi spektralnega neujemanja pri preskušanju fotonapetostnih naprav (IEC 60904-7:2008)

General Information

• Status: Withdrawn
• Public Enquiry End Date: 28-Feb-2007
• Publication Date: 15-Jul-2009
• Withdrawal Date: 28-Aug-2022
• ICS: 27.160 - Solar energy engineering
• Technical Committee: PVS - Solar photovoltaic energy systems
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 24-Aug-2022
• Due Date: 16-Sep-2022
• Completion Date: 29-Aug-2022
• Ref Project: EN 60904-7:2009 - Photovoltaic devices - Part 7: Computation of the spectral mismatch correction for measurements of photovoltaic devices

Relations

• Replaced By: SIST EN IEC 60904-7:2019 - Photovoltaic devices - Part 7: Computation of the spectral mismatch correction for measurements of photovoltaic devices
• Effective Date: 01-Dec-2019
• Replaces: SIST EN 60904-7:2001 - Photovoltaic devices -- Part 7: Computation of spectral mismatch error introduced in the testing of a photovoltaic device
• Effective Date: 01-Sep-2009
• Replaces: SIST EN 60904-7:2001 - Photovoltaic devices -- Part 7: Computation of spectral mismatch error introduced in the testing of a photovoltaic device
• Effective Date: 28-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60904-7:2009
01-september-2009
)RWRQDSHWRVWQHQDSUDYHGHO,]UDþXQDYDQMHQDSDNH]DUDGLVSHNWUDOQHJD
QHXMHPDQMDSULSUHVNXãDQMXIRWRQDSHWRVWQLKQDSUDY,(&
Photovoltaic devices -- Part 7: Computation of the spectral mismatch correction for
measurements of photovoltaic devices
Photovoltaische Einrichtungen - Teil 7: Berechnung der spektralen
Fehlanpassungskorrektion für Messungen an photovoltaischen Einrichtungen
Dispositifs photovoltaïques -- Partie 7: Calcul de la correction de désadaptation des
réponses spectrales dans les mesures de dispositifs photovoltaïques
Ta slovenski standard je istoveten z: EN 60904-7:2009
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
SIST EN 60904-7:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60904-7:2009

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SIST EN 60904-7:2009

EUROPEAN STANDARD
EN 60904-7

NORME EUROPÉENNE
March 2009
EUROPÄISCHE NORM

ICS 27.160 Supersedes EN 60904-7:1998


English version


Photovoltaic devices -
Part 7: Computation of the spectral mismatch correction
for measurements of photovoltaic devices
(IEC 60904-7:2008)


Dispositifs photovoltaïques -  Photovoltaische Einrichtungen -
Partie 7: Calcul de la correction Teil 7: Berechnung der spektralen
de désadaptation des réponses spectrales Fehlanpassungskorrektion für Messungen
dans les mesures de dispositifs an photovoltaischen Einrichtungen
photovoltaïques (IEC 60904-7:2008)
(CEI 60904-7:2008)




This European Standard was approved by CENELEC on 2009-03-01. 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, 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

Central Secretariat: avenue Marnix 17, B - 1000 Brussels


© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60904-7:2009 E

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SIST EN 60904-7:2009
EN 60904-7:2009 - 2 -
Foreword
The text of document 82/540/FDIS, future edition 3 of IEC 60904-7, prepared by IEC TC 82, Solar
photovoltaic energy systems, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60904-7 on 2009-03-01.
This European Standard supersedes EN 60904-7:1998.
The main changes with respect to EN 60904-7:1998 are listed below:
– the title has been modified in order to better reflect the purpose of the standard (changed from
“mismatch error” to “mismatch correction”);
– formulae are now accompanied by explanatory text;
– Clause 3 “Description of method” now describes when it is necessary to use the method and when it
may not be needed. It describes what data must be collected before the mismatch correction can be
calculated;
– Clauses 4, 5 and 6 have been added;
– the formula for the mismatch correction has been corrected.
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) 2009-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-03-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60904-7:2008 was approved by CENELEC as a European
Standard without any modification.
__________

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SIST EN 60904-7:2009
- 3 - EN 60904-7:2009
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

1) 2)
IEC 60891 - Procedures for temperature and irradiance EN 60891 1994
corrections to measured I-V characteristics
of crystalline silicon photovoltaic devices


1) 2)
IEC 60904-1 - Photovoltaic devices - EN 60904-1 2006
Part 1: Measurement of photovoltaic
current-voltage characteristics


1) 2)
IEC 60904-2 - Photovoltaic devices - EN 60904-2 2007
Part 2: Requirements for reference solar
devices


1) 2)
IEC 60904-3 - Photovoltaic devices - EN 60904-3 2008
Part 3: Measurement principles for terrestrial
photovoltaic (PV) solar devices with reference
spectral irradiance data


1) 2)
IEC 60904-8 - Photovoltaic devices - EN 60904-8 1998
Part 8: Measurement of spectral response
of a photovoltaic (PV) device


1) 2)
IEC 60904-9 - Photovoltaic devices - EN 60904-9 2007
Part 9: Solar simulator performance
requirements


1) 2)
IEC 60904-10 - Photovoltaic devices - EN 60904-10 1998
Part 10: Methods of linearity measurement


1) 2)
IEC 61215 - Crystalline silicon terrestrial photovoltaic EN 61215 2005
(PV) modules - Design qualification and type
approval


1) 2)
IEC 61646 - Thin-film terrestrial photovoltaic (PV) EN 61646 2008
modules - Design qualification and type
approval



1)
Undated reference.
2)
Valid edition at date of issue.

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SIST EN 60904-7:2009

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SIST EN 60904-7:2009
IEC 60904-7
Edition 3.0 2008-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Photovoltaic devices –
Part 7: Computation of the spectral mismatch correction for measurements of
photovoltaic devices

Dispositifs photovoltaïques –
Partie 7: Calcul de la correction de désadaptation des réponses spectrales dans
les mesures de dispositifs photovoltaïques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
K
CODE PRIX
ICS 27.160 ISBN 2-8318-1017-5
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 60904-7:2009
– 2 – 60904-7 © IEC:2008
CONTENTS
FOREWORD.3
1 Scope and object.5
2 Normative references .5
3 Description of method.6
4 Apparatus.7
5 Determination of spectral response .7
6 Determination of test spectrum .7
7 Determination of the spectral mismatch factor .8
8 Report .9
Bibliography.10

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SIST EN 60904-7:2009
60904-7 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

PHOTOVOLTAIC DEVICES –

Part 7: Computation of the spectral mismatch correction
for measurements of photovoltaic devices


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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 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 60904-7 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
82/540/FDIS 82/547/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This third edition cancels and replaces the second edition published in 1998. It constitutes a
technical revision. The main changes with respect to the previous edition are listed below:
• the title has been modified in order to better reflect the purpose of the standard (changed
from “mismatch error” to “mismatch correction”);

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SIST EN 60904-7:2009
– 4 – 60904-7 © IEC:2008
• formulae are now accompanied by explanatory text;
• Clause 3 “Description of method” now describes when it is necessary to use the method
and when it may not be needed. It describes what data must be collected before the
mismatch correction can be calculated;
• Clauses 4, 5 and 6 have added;
• the formula for the mismatch correction has been corrected.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60904 series, published under the general title Photovoltaic devices,
can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.

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SIST EN 60904-7:2009
60904-7 © IEC:2008 – 5 –
PHOTOVO
...