IEC 61427-2:2015

IEC 61427-2 ®
Edition 1.0 2015-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries for renewable energy storage – General
requirements and methods of test –
Part 2: On-grid applications
Accumulateurs pour le stockage de l'énergie renouvelable – Exigences
générales et méthodes d'essais –
Partie 2: Applications en réseau

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
15 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.

Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
Plus de 60 000 entrées terminologiques électrotechniques, en
La recherche avancée permet de trouver des publications IEC
en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et
comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus
projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des

CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
csc@iec.ch.
IEC 61427-2 ®
Edition 1.0 2015-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries for renewable energy storage – General

requirements and methods of test –

Part 2: On-grid applications
Accumulateurs pour le stockage de l'énergie renouvelable – Exigences

générales et méthodes d'essais –

Partie 2: Applications en réseau

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.20 ISBN 978-2-8322-2881-4

– 2 – IEC 61427-2:2015 © IEC 2015
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General considerations . 13
5 General test conditions . 14
5.1 Accuracy of measuring equipment . 14
5.1.1 Voltage measurements . 14
5.1.2 Current measurements . 14
5.1.3 Temperature measurements . 14
5.1.4 Time measurements . 14
5.2 Test object considerations . 14
5.3 Test object battery selection and size considerations . 15
5.4 Test plan . 16
6 Battery endurance . 20
6.1 General . 20
6.2 Test for endurance in frequency-regulation service . 20
6.3 Test for endurance in load-following service . 25
6.4 Test for endurance in peak-power shaving service . 28
6.5 Test for endurance in photovoltaic energy storage, time-shift service . 30
7 Battery properties and electrical performance . 33
7.1 Declaration of the system properties . 33
7.2 Determination of energy content at +25 °C ambient temperature . 36
7.3 Determination of the energy efficiency during endurance tests at +25 °C
ambient temperature . 36
7.4 Determination of the energy efficiency during endurance tests at the
minimum and maximum ambient temperature . 38
7.5 Determination of waste heat generated during endurance tests at the
maximum ambient temperature . 42
7.6 Determination of energy requirements during periods of idle state at +25 °C
ambient temperature . 44
Annex A (informative) Battery-related hazards . 47
A.1 General . 47
A.2 Examples . 47
Bibliography . 49

Figure 1 – Boundary of the full-sized battery (FSB) . 15
Figure 2 – Two-step selection process of the test object battery (TOB) . 16
Figure 3 – Workflow for the determination of endurance properties and electrical
performance of the TOB as governed by the sequence of test data generation within
6.2 to 6.5 . 17
Figure 4 – Sequence of performance tests carried out with TOB 1 within an endurance
test 6.x . 17
Figure 5 – Workflow and decision tree for endurance tests 6.2 through 6.5 . 19
Figure 6 – Frequency regulation service test routine profile (6.2) – Profile a . 22
Figure 7 – Frequency regulation service test routine profile (6.2) – Profile b . 22

Figure 8 – Frequency regulation service test routine profile (6.2) – Profile c . 23
Figure 9 – Schematic view of the evolution of battery voltage over time during cycling
with constant power discharge and charge pulses . 24
Figure 10 – Load-following service test routine profile (6.3) – Profile a . 26
Figure 11 – Load-following service test routine profile (6.3) – Profile b . 27
Figure 12 – Load-following service test routine profile (6.3) – Profile c . 27
Figure 13 – Daily peak-power shaving service test routine profile (6.4) . 29
Figure 14 – Daily photovoltaic energy storage time-shift service test routine (6.5) –
3 kW . 32
Figure 15 – Daily photovoltaic energy storage time-shift service test routine (6.5) –
30 kW . 32
Figure 16 – Schematic view of the location of the two sets of energy values (energy to
auxiliaries and energy to and from TOB) to be used for the determination of the
energy storage efficiency factor η . 37
Figure 17 – Schematic view of the location of the two sets of energy values (energy to
auxiliaries and energy to and from battery) to be used for the determination of the
amount of waste heat generated . 43
Figure 18 – Schematic view of the location of the two sets of energy values (energy to
auxiliaries and energy to battery) to be used for the determination of the energy
requirements during periods of idle state of the battery . 45

Table 1 – Summary of endurance test related electrical property data of the full-sized
(FSB) and the test object (TOB) battery . 34
Table 2 – Summary of physical dimension data of the full-sized battery (FSB) . 35
Table 3 – Summary description of the full-sized battery (FSB) . 35
Table 4 – Summary description of the test-object battery (TOB) . 35
Table 5 – Summary of the constant power discharge performance of the TOB at an
ambient temperature of +25 °C ± 3 K .
...