SIST EN 61853-1:2011

Photovoltaic (PV) module performance testing and energy rating - Part 1: Irradiance and temperature performance measurements and power rating

This part of IEC 61853 describes requirements for evaluating PV module performance in terms of power (watts) rating over a range of irradiances and temperatures. IEC 61853-2 describes test procedures for measuring the performance effect of angle of incidence; the estimation of module temperature from irradiance, ambient temperature and wind speed; and impact of spectral response on energy production. IEC 61853-3 describes the calculations of PV module energy (watt-hours) ratings. IEC 61853-4 describes the standard time periods and weather conditions that can be utilized for calculating standardized energy ratings.
The object of this part of IEC 61853 is to define a testing and rating system, which provides the PV module power (watts) at maximum power operation for a set of defined conditions. A second purpose is to provide a full set of characterization parameters for the module under various values of irradiance and temperature. This set of measurements is required in order to perform the module energy rating described in IEC 61853-3.

Prüfung des Leistungsverhaltens von photovoltaischen (PV-)Modulen und Energiebemessung - Teil 1: Leistungsmessung in Bezug auf Bestrahlungsstärke und Temperatur sowie Leistungsbemessung

Essais de performance et caractéristiques assignées d'énergie des modules photovoltaïques (PV) - Partie 1: Mesures de performance en fonction de l'éclairement et de la température, et de caractéristiques de puissance

La CEI 61853-1:2011 définit les exigences relatives à l'évaluation de la performance d'un module PV, en termes de caractéristiques de puissance (watts), sur une plage d'éclairements et de températures. L'objet est de définir un système d'essai et de caractérisation, donnant la puissance (watts) du module PV lorsqu'il fonctionne à puissance maximale et pour un ensemble de conditions définies. Un deuxième objet est de fournir un ensemble complet de paramètres de caractérisation relatif au module, sous diverses valeurs d'éclairement et de température.

Preskušanje zmogljivosti in energijske učinkovitosti fotonapetostnega modula - 1. del: Merjenje vpliva sevanja in temperature na zmogljivost (IEC 61853-1:2011)

Ta del IEC 61853 opisuje zahteve za vrednotenje fotonapetostnega modula glede zmogljivosti (v vatih) pri več različnih sevanjih in temperaturah. IEC 61853-2 opisuje preskusne postopke za merjenje vpliva vpadnega kota, ocenjevanje temperature modula zaradi sevanja, okoljske temperature in hitrosti vetra ter vpliva spektralnega odziva na proizvodnjo energije. IEC 61853-3 opisuje izračune energijskih učinkovitosti fotonapetostnega modula (v vatnih urah). IEC 61853-4 opisuje standardna časovna obdobja in vremenske pogoje, ki se lahko uporabijo za izračun standardiziranih energijskih učinkovitosti.
Cilj tega dela IEC 61853 je opredeliti preskusni in ocenjevalni sistem, ki zagotavlja moč fotonapetostnega modula (v vatih) pri obratovanju z največjo močjo za vrsto opredeljenih pogojev. Drug cilj je zagotoviti celoten niz karakterizacijskih parametrov za modul pri različnih vrednostih sevanja in temperature. Ta niz meritev se zahteva za izvedbo preskušanja energijske učinkovitosti modula, opisane v IEC 61853-3.

General Information

• Status: Published
• Publication Date: 10-Apr-2011
• ICS: 27.160 - Solar energy engineering
• Technical Committee: PVS - Solar photovoltaic energy systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 30-Mar-2011
• Due Date: 04-Jun-2011
• Completion Date: 11-Apr-2011
• Ref Project: EN 61853-1:2011 - Photovoltaic (PV) module performance testing and energy rating - Part 1: Irradiance and temperature performance measurements and power rating

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61853-1:2011
01-maj-2011
3UHVNXãDQMH]PRJOMLYRVWLLQHQHUJLMVNHXþLQNRYLWRVWLIRWRQDSHWRVWQHJDPRGXOD
GHO0HUMHQMHYSOLYDVHYDQMDLQWHPSHUDWXUHQD]PRJOMLYRVW,(&
Photovoltaic (PV) module performance testing and energy rating - Part 1: Irradiance and
temperature performance measurements and power rating
Prüfung des Leistungsverhaltens von photovoltaischen (PV-)Modulen und
Energiebemessung - Teil 1: Leistungsmessung in Bezug auf Bestrahlungsstärke und
Temperatur sowie Leistungsbemessung
Essais de performance et caractéristiques assignées d'énergie des modules
photovoltaïques (PV) - Partie 1: Mesures de performance en fonction de l'éclairement et
de la température, et de caractéristiques de puissance
Ta slovenski standard je istoveten z: EN 61853-1:2011
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
SIST EN 61853-1:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61853-1:2011

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SIST EN 61853-1:2011

EUROPEAN STANDARD
EN 61853-1

NORME EUROPÉENNE
March 2011
EUROPÄISCHE NORM

ICS 27.160


English version


Photovoltaic (PV) module performance testing and energy rating -
Part 1: Irradiance and temperature performance measurements and power
rating
(IEC 61853-1:2011)


Essais de performance et caractéristiques Prüfung des Leistungsverhaltens von
assignées d'énergie des modules photovoltaischen (PV-)Modulen und
photovoltaïques (PV) - Energiebemessung -
Partie 1: Mesures de performance en Teil 1: Leistungsmessung in Bezug auf
fonction de l'éclairement et de la Bestrahlungsstärke und Temperatur sowie
température, et caractéristiques de Leistungsbemessung
puissance (IEC 61853-1:2011)
(CEI 61853-1:2011)




This European Standard was approved by CENELEC on 2011-03-02. 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 61853-1:2011 E

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SIST EN 61853-1:2011
EN 61853-1:2011 - 2 -
Foreword
The text of document 82/613/FDIS, future edition 1 of IEC 61853-1, prepared by IEC TC 82, Solar
photovoltaic energy systems, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61853-1 on 2011-03-02.
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
(dop) 2011-12-02
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2014-03-02
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61853-1:2011 was approved by CENELEC as a European
Standard without any modification.
__________

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SIST EN 61853-1:2011
- 3 - EN 61853-1:2011

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 60410 - Sampling plans and procedures - -
for inspection by attributes


IEC 60891 2009 Photovoltaic devices - Procedures for EN 60891 2010
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 60904-3 - Photovoltaic devices - EN 60904-3 -
Part 3: Measurement principles for terrestrial
photovoltaic (PV) solar devices with reference
spectral irradiance data


IEC 60904-5 - Photovoltaic devices - EN 60904-5 -
Part 5: Determination of the equivalent cell
temperature (ECT) of photovoltaic (PV)
devices by the open-circuit voltage method


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


IEC 60904-9 - Photovoltaic devices - EN 60904-9 -
Part 9: Solar simulator performance
requirements


IEC 60904-10 - Photovoltaic devices - EN 60904-10 -
Part 10: Methods of linearity measurement


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


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

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SIST EN 61853-1:2011

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SIST EN 61853-1:2011
IEC 61853-1
®

Edition 1.0 2011-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Photovoltaic (PV) module performance testing and energy rating –
Part 1: Irradiance and temperature performance measurements and power
rating

Essais de performance et caractéristiques assignées d'énergie des modules
photovoltaïques (PV) –
Partie 1: Mesures de performance en fonction de l'éclairement et de la
température, et caractéristiques de puissance

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX Q
ICS 27.160 ISBN 978-2-88912-301-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 61853-1:2011
– 2 – 61853-1  IEC:2011
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope and object . 6
2 Normative references . 6
3 Sampling . 7
4 Marking . 7
5 Testing and pass criteria . 7
6 Report . 8
7 Power rating conditions . 8
7.1 General . 8
7.2 STC (Standard Test Conditions) . 9
7.3 NOCT (Nominal Operating Cell Temperature) . 9
7.4 LIC (Low Irradiance Condition) . 9
7.5 HTC (High Temperature Condition) . 9
7.6 LTC (Low Temperature Condition) . 9
8 Procedure for irradiance and temperature performance measurements . 9
8.1 Purpose . 9
8.2 Simplified procedure for linear modules . 10
8.3 Procedure in natural sunlight with tracker . 11
8.4 Procedure in natural sunlight without tracker . 13
8.5 Procedure with a solar simulator . 13
9 Rating of power . 15
9.1 Interpolation of I , V , V and P . 15
sc oc max max
9.1.1 General . 15
9.1.2 Interpolation of I , V , V and P with respect to temperature . 15
sc oc max max
9.1.3 Interpolation of I with respect to irradiance . 15
sc
9.1.4 Interpolation of V with respect to irradiance . 15
oc
9.1.5 Interpolation of P with respect to irradiance . 16
max
9.1.6 Appropriateness of fitting method . 16
9.2 Power rating . 16

Figure 1 – Positions for measuring the temperature of the test module behind the cells . 11

Table 1 – Summary of reference power conditions (at AM 1,5) . 9
Table 2 – I , P , V and V versus irradiance and temperature . 10
sc max oc max

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SIST EN 61853-1:2011
61853-1  IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

PHOTOVOLTAIC (PV) MODULE
PERFORMANCE TESTING AND ENERGY RATING –

Part 1: Irradiance and temperature performance
measurements and power rating


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 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 61853-1 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
82/613/FDIS 82/622/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 publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN 61853-1:2011
– 4 – 61853-1  IEC:2011
A list of all parts of the IEC 61853 series can be found, under the general title Photovoltaic
(PV) module performance testing and energy rating, on the IEC website.
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.

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SIST EN 61853-1:2011
61853-1  IEC:2011 – 5 –
INTRODUCTION
This International Standard series establishes IEC requirements for evaluating PV module
performance based on power (watts), energy (watt-hours) and performance ratio (PR). It is
written to be applicable to all PV technologies including non-linear devices, but the
methodology does not take into account transient behaviour such as light induced changes
and/or thermal annealing.
Included in the IEC 61853 series of standards are: a guide to mapping module performance
over a wide range of temperature and irradiance conditions; methods for characterising
spectral and angular effects; definition of reference climatic profiles (temperature and
irradiance); methods for evaluating instantaneous power and energy results; and a method for
stating these results in the form of a numerical rating.

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SIST EN 61853-1:2011
– 6 – 61853-1  IEC:2011
PHOTOVOLTAIC (PV) MODULE
PERFORMANCE TESTING AND ENERGY RATING –

Part 1: Irradiance and temperature performance
measurements and power rating



1 Scope and object
This part of IEC 61853 describes requirements for evaluating PV module performance in
terms of power (watts) rating over a range of irradiances and temperatures. IEC 61853-2
describes test procedures for measuring the performance effect of angle of incidence; the
estimation of module temperature from irradiance, ambient temperature and wind speed; and
impact of spectral response on energy production. IEC 61853-3 describes the calculations of
PV module energy (watt-hours) ratings. IEC 61853-4 describes the standard time periods and
weather conditions that can be utilized for calculating standardized energy ratings.
The object of this part of IEC 61853 is to define a testing and rating system, which provides
the PV module power (watts) at maximum power operation for a set of defined conditions. A
second purpose is to provide a full set of characterization parameters for the module under
various values of irradiance and temperature. This set of measurements is required in order to
perform the module energy rating described in IEC 61853-3.
2 Normative references
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.
IEC 60410, Sampling plans and procedures for inspection by attributes
IEC 60891:2009, Photovoltaic devices – Procedures for temperature and irradiance
corrections to measured I-V characteristics
IEC 60904-1, Photovoltaic devices – Part 1: Measurement of photovoltaic current-voltage
characteristics
IEC 60904-2, Photovoltaic devices – Part 2: Requirements for reference solar devices
IEC 60904-3, Photovoltaic devices – Part 3: Measurement principles for terrestrial
photovoltaic (PV) solar devices with reference spectral irradiance data
IEC 60904-5, Photovoltaic devices – Part 5: Determination of equivalent cell temperature
(ECT) of photovoltaic (PV) devices by the open-circuit voltage method
IEC 60904-7, Photovoltaic devices – Part 7: Computation of spectral mismatch correction for
measurements of photovoltaic devices
IEC 60904-9, Photovoltaic devices – Part 9: Solar simulator performance requirements
IEC 60904-10, Photovoltaic devices – Part 10: Methods of linearity measurement

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SIST EN 61853-1:2011
61853-1  IEC:2011 – 7 –
IEC 61215:2005, Crystalline silicon terrestrial photovoltaic (PV) modules – Design
qualification and type approval
IEC 61646:2008, Thin film terrestrial photovoltaic (PV) modules – Design qualification and
type approval
3 Sampling
For performance qualification testing three modules shall be selected at random from a
production batch or batches in accordance with the procedure given in IEC 60410. The
modules shall be pre-conditioned in accordance with Clause 5 to ensure the stability of the
power values.
The modules shall have been manufactured from specified materials and components in
accordance with the relevant drawings and process sheets and shall have been subjected to
the manufacture’s normal inspection, quality control and production acceptance procedures.
The modules shall be complete in every detail and shall be accompanied by the
manufacturer’s handling and final assembly instructions regarding the recommended
installation of any diodes, frames, brackets, etc.
When the modules to be tested are prototypes of a new design and not from production, this
fact shall be noted in the test report (see Clause 6).
4 Marking
Each module shall carry the following clear and indelible markings:
– name, monogram or symbol of the manufacturer;
– type or model number;
– serial number;
– polarity of terminals or leads (colour coding is permissible);
– nominal and minimum values of maximum output power at STC after preconditioning, as
specified by the manufacturer for the product type (see Clause 5).
The date and place of manufacture shall be marked on the module or be traceable from the
serial number.
For future production the power ratings for NOCT, LIC, HTC and LTC determined by this
standard as defined in Clause 7 and Table 1 and determined via the procedure in 9.2 shall be
marked on a label, or be stated in the manufacturer’s literature provided with each module of
this type.
5 Testing and pass criteria
The modules shall be subjected to the procedure for irradiance and temperature performance
measurements defined in Clause 8. In carrying out the tests, the manufacturer’s handling,
mounting and connection instructions shall be observed.
Special considerations: Preconditioning - Before beginning the measurements, the device
under test shall be stabilized by light soaking, as specified in IEC 61215 (Clause 5) or
IEC 61646 (10.19).
The values of STC power measured after preconditioning shall fall within the power range
specified by the manufacturer of this product.

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SIST EN 61853-1:2011
– 8 – 61853-1  IEC:2011
NOTE The pass/fail criteria must consider the laboratory uncertainty of the measurement. As an example, if the
laboratory extended uncertainty of the STC measurement is ±5 %, then a nominal nameplate rated power greater
than 95 % of the laboratory measured power would meet the pass criteria.
After generating the matrix of parameters in Section 8 the modules should be remeasured at
STC to verify that the performance is stable.
6 Report
Following completion of the procedure, a certified report of the performance tests, with
measured power characteristics shall be prepared by the test agency in accordance with the
procedures of ISO/IEC 17025. Each certificate or test report shall include at least the
following information:
a) a title;
b) name and address of the test laboratory and location where the calibration or tests were
carried out;
c) unique identification of the certification or report and of each page;
d) name and address of client, where appropriate;
e) description and identification of the item calibrated or tested;
f) characterization and condition of the calibration or test item;
g) date of receipt of test item and date(s) of calibration or test, where appropriate;
h) identification of calibration or test method used;
i) reference to sampling procedure, where relevant;
j) any deviations from, additions to or exclusions from the calibration or test method, and
any other information relevant to a specific calibration or test, such as environmental
conditions;
k) a statement as to whether the simplified method in section 8 was used to complete the
matrix. If the simplified method was used, the test report should give the values of relative
temperature coefficients for maximum power and open circuit voltage for the two different
irradiances used to validate the use of the simplified method;
l) measurements, examinations and derived results, including as a minimum table 2 for I ,
sc
P , V and V , values of the module thermal coefficients α β , the average power
max oc max I, I
and the values for each of the three test modules at all reference power conditions
(defined in section 7) and the temperature coefficient of module power (W) at the
maximum power point (γ );
I
m) a statement of the estimated uncertainty of the calibration or test result (where relevant);
n) a statement as to whether the measured STC power agrees with the manufacturer’s rated
power range within the test laboratories measurement uncertainty;
o) a signature and title, or equivalent identification of the person(s) accepting responsibility
for the content of the certificate or report, and the date of issue;
p) where relevant, a statement to the effect that the results relate only to the items calibrated
or tested;
q) a statement that the certificate or report shall not be reproduced except in full, without the
written approval of the laboratory.
7 Power rating conditions
7.1 General
The reference power conditions are shown in Table 1 and are described in more detail in the
following subclauses. The first three reference power conditions are defined in
IEC 61215/IEC 61646. The modules shall be tested and the maximum power determined for

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SIST EN 61853-1:2011
61853-1  IEC:2011 – 9 –
the following rating conditions. For each rating condition the Air Mass 1,5 spectral irradiance
distribution as given in IEC 60904-3 shall be used as well as normal incidence irradiance.
7.2 STC (Standard Test Conditions)
– Cell temperature: 25 °C.
–2
– Irradiance: 1 000 W⋅m .
7.3 NOCT (Nominal Operating Cell Temperature)
– Cell temperature: NOCT (As determined in accordance with 10.5 of IEC 61215 or
IEC 61646).
–2
– Irradiance: 800 W⋅m .
7.4 LIC (Low Irradiance Condition)
– Cell temperature: 25 °C.
–2
– Irradiance: 200 W⋅m .
7.5 HTC (High Temperature Condition)
– Cell temperature: 75 °C.
–2
– Irradiance: 1 000 W⋅m .
7.6 LTC (Low Temperature Condition)
– Cell temperature: 15 °C.
–2
– Irradiance: 500 W⋅m .
Table 1 – Summary of reference power conditions (at AM 1,5)
Condition Irradiance
Temperature
–2
W⋅m °C
STC 1 000 25 of cell
Standard Test Conditions
NOCT 800 20 of ambient
Nominal Operating Cell
Temperature
(Determined according to
IEC 61215 or IEC 61646)
LIC 200 25 of cell
Low Irradiance Condition
HTC 1000 75 of cell
High Temperature Condition
LTC 500 15 of cell
Low Temperature Condition
NOTE The conditions provided in this table may be measured directly as part of the performance matrix
defined in Clause 8.
8 Procedure for irradiance and temperature performance measurements
8.1 Purpose
To determine the impact of irradiance and temperature on module performance:
The power delivery of photovoltaic devices is a direct function of module temperature and
incident irradiance level. PV device performance is linear with temperature for many

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SIST EN 61853-1:2011
– 10 – 61853-1  IEC:2011
crystalline silicon materials, but no general relation can be given for thin film materials. The
short circuit current is often linear with respect to irradiance. The logarithmic variation of open
circuit voltage and nonlinear variations of fill factor with the irradiance often render the
maximum power a nonlinear function of light levels. Rather than using extensive modelling of
these processes, the relations will be measured as functions of irradiance and temperature.
NOTE If I of the module has been demonstrated to be linear (IEC 60904-10), I can be utilized as the
sc sc
measurement of the irradiance level used in the test.
Matrices of module performance with respect to temperature and irradiance shall be
measured. Separate tables for I , V , V and P shall be generated using sufficient data
sc oc max max
to assure statistical validity to the measurements (see 8.3.11 and 8.5.11). The tables for V
oc
and V are not utilized for energy ratings, but are useful characteristics of the module type
max
particularly for system design purposes.
Measurements need not be taken at exactly the irradiances and temperatures specified.
Translation of I-V curves from the actual irradiance and/or temperature values to the values
prescribed by the tables can be performed in accordance with IEC 60891. Such interpolation
–2
should be over no more than 100 W⋅m . All such interpolations shall be noted in the test
report and their impact on uncertainly shall be included in the uncertainly analysis.
Nevertheless, measurements shall be taken at or beyond the extremes of irradiance specified
in Table 2 within the measurement accuracy of the instrumentation and the constraints of
section 8.3.2.
A table of each of the parameters I , P , V and V , shall be made according to the
sc max oc max
example in Table 2.
2 2
NOTE 1 To assess nonlinearities, measurements at 300 W/m and 50 W/m can be helpful.
NOTE 2 Tables of the parameters I and Fill Factor (FF) can be generated from the four measured parameters.
max

Table 2 – I , P , V and V versus irradiance and temperature
sc max oc max
Irradiance Spectrum Module temperature
–2
W⋅m 15 °C 25 °C 50 °C 75 °C
1 100 AM1,5 NA
1 000 AM1,5
800 AM1,5
600 AM1,5
400 AM1,5  NA
200 AM1,5  NA NA
100 AM1,5  NA NA

AM1,5 is defined in IEC 60904-3.
There are four procedures for performing the test matrix of module performance with respect
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