IEC TS 62257-9-6:2019

Renewable energy and hybrid systems for rural electrification - Part 9-6: Integrated systems - Recommendations for selection of Photovoltaic Individual Electrification Systems (PV-IES)

IEC 62257-9-6:2019 proposes a simple selection procedure and cheap, comparative tests which can be performed in laboratories of developing countries, in order to identify the most suitable model of small Photovoltaic Individual Electrification Systems (PV- IES) up to 500 Wp for a particular rural electrification project from a number of products submitted for test. The tests provided in IEC TS 62257-9-6 allow assessment of the performance of a PV-IES according to the requirement of the general specification of the project (see IEC/TS 62257-2) and to verify their ability to provide the required service. This second edition of IEC TS 62257-9-6 cancels and replaces the first edition published in 2008. The main technical changes with respect to the previous edition are as follows:
- Removal of the term "small" from the title of the publication and from description of rural electrification systems.
- Removal of the limits on system voltage and power; these recommendations apply to systems of all sizes.

General Information

• Status: Published
• Publication Date: 25-Sep-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.160 - Solar energy engineering
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: TC 82 - Solar photovoltaic energy systems
• Drafting Committee: JWG 1 - TC 82/JWG 1
• Current Stage: PPUB - Publication issued
• Start Date: 30-Sep-2019
• Completion Date: 26-Sep-2019

Relations

• Revises: IEC TS 62257-9-6:2008 - Recommendations for small renewable energy and hybrid systems for rural electrification - Part 9-6: Integrated system - Selection of Photovoltaic Individual Electrification Systems (PV-IES)
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TS 62257-9-6 ®
Edition 2.0 2019-09
TECHNICAL
SPECIFICATION
colour
inside
Renewable energy and hybrid systems for rural electrification –
Part 9-6: Integrated systems – Recommendations for selection of Photovoltaic
Individual Electrification Systems (PV-IES)
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.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: [e-mail].
IEC TS 62257-9-6 ®
Edition 2.0 2019-09
TECHNICAL
SPECIFICATION
colour
inside
Renewable energy and hybrid systems for rural electrification –

Part 9-6: Integrated systems – Recommendations for selection of Photovoltaic

Individual Electrification Systems (PV-IES)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160; 27.180 ISBN 978-2-8322-7353-1

– 2 – IEC TS 62257-9-6:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 9
4 System boundaries . 9
5 System pre-selection . 9
5.1 Services to be provided by the system . 9
5.2 Specification of a model . 9
5.2.1 General operating conditions . 9
5.2.2 Design . 9
5.2.3 Components requirements . 10
5.2.4 Safety issues . 10
5.2.5 Installation rules . 10
5.2.6 Operation and maintenance rules . 10
5.2.7 Documentation and marking . 10
5.3 Pre-selection process . 11
5.3.1 Elements of the GS to be provided to potential suppliers . 11
5.3.2 Answers to be provided by potential suppliers . 11
5.3.3 Pre-selection criteria . 11
6 Comparative tests . 11
6.1 General . 11
6.2 Service requirements . 12
6.3 Service quality index . 12
6.4 Testing programme . 15
6.4.1 General . 15
6.4.2 Test 1: initial inspection and commissioning . 16
6.4.3 Test 2: ability to provide the required service under daylight favourable
conditions . 17
6.4.4 Test 3: ability to provide the required service under daylight
unfavourable conditions . 20
6.4.5 Test 4: final inspection . 22
6.4.6 General conclusion . 22
Annex A (informative) Data record sheet for visual inspection . 24
Annex B (informative) Commissioning records sheet . 25
Annex C (informative) Examples of load profiles for comparative tests . 26
C.1 Examples of loads. 26
C.2 Examples of systems . 26
C.3 Examples of load profiles . 27
Annex D (informative) Instruction and data record sheet models (according to a load
profile as proposed in Annex A) . 28
Bibliography . 35

Figure 1 – Test 2, Phase A: initial charge cycles . 18
Figure 2 – Test 2, Phase B: operating cycles . 19
Figure 3 – Test 3, operating cycles . 21

Table 1 – Climatic conditions (example) . 9
Table 2 – Suggested minimum values for IP and IK . 10
Table 3 – Lighting service indexes . 13
Table 4 – Radio / TV service indexes . 14
Table 5 – Refrigeration service indexes . 14
Table 6 – Testing programme . 16
Table A.1 – Data record sheet for visual inspection (example) . 24
Table B.1 – Commissioning records sheet (example) . 25
Table C.1 – Example of loads . 26
Table C.2– Example of small PV-IES loads (~50 Wp) . 26
Table C.3 – Example of medium PV-IES loads (~200 Wp) . 26
Table C.4 – Example of large PV-IES loads (~500 Wp) . 27
Table C.5 – Example of system load profile to perform test on PV-IES . 27
Table D.1 – Overview instruction sheet for daily records (example) . 28
Table D.2 – Record sheet for lighting service (example) . 30
Table D.3 – Record sheet for radio service (example) . 31
Table D.4 – Record sheet for TV service (example) . 32
Table D.5 – Record sheet for refrigeration service (example) . 33
Table D.6 – System daily quality index of service evaluation (example) . 34

– 4 – IEC TS 62257-9-6:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RENEWABLE ENERGY AND HYBRID SYSTEMS
FOR RURAL ELECTRIFICATION –
Part 9-6: Integrated systems – Recommendations for selection
of Photovoltaic Individual Electrification Systems (PV-IES)

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
pa
...

IEC TS 62257-9-6 ®
Edition 2.0 2019-09
REDLINE VERSION
TECHNICAL
SPECIFICATION
colour
inside
Recommendations for small Renewable energy and hybrid systems for rural
electrification –
Part 9-6: Integrated system – Recommendations for selection of Photovoltaic
Individual Electrification Systems (PV-IES)

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.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: [e-mail].
IEC TS 62257-9-6 ®
Edition 2.0 2019-09
REDLINE VERSION
TECHNICAL
SPECIFICATION
colour
inside
Recommendations for small Renewable energy and hybrid systems for rural

electrification –
Part 9-6: Integrated system – Recommendations for selection of Photovoltaic

Individual Electrification Systems (PV-IES)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160; 27.180 ISBN 978-2-8322-7454-5

– 2 – IEC TS 62257-9-6:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 10
4 System boundaries . 10
5 System pre-selection . 10
5.1 Services to be provided by the system . 10
5.2 Specification of a model . 10
5.2.1 General operating conditions . 10
5.2.2 Design . 11
5.2.3 Components requirements . 11
5.2.4 Safety issues . 11
5.2.5 Installation rules . 11
5.2.6 Operation and maintenance rules . 11
5.2.7 Documentation and marking . 12
5.3 Pre-selection process . 12
5.3.1 Elements of the GS to be provided to potential suppliers . 12
5.3.2 Answers to be provided by potential suppliers . 12
5.3.3 Pre-selection criteria . 12
6 Comparative tests . 13
6.1 General . 13
6.2 Service requirements . 13
6.3 Service quality index . 13
6.4 Testing programme . 16
6.4.1 General . 16
6.4.2 Test 1: initial inspection and commissioning . 17
6.4.3 Test 2: ability to provide the required service under daylight favourable
conditions . 18
6.4.4 Test 3: ability to provide the required service under daylight
unfavourable conditions . 21
6.4.5 Test 4: final inspection . 23
6.4.6 General conclusion . 23
Annex A (informative) Data record sheet for visual inspection . 25
Annex B (informative) Commissioning records sheet . 26
Annex C (informative) Examples of load profiles for comparative tests . 28
C.1 Examples of loads. 28
C.2 Examples of systems . 28
C.3 Examples of load profiles . 29
Annex D (informative) Instruction and data record sheet models (according to a load
profile as proposed in Annex A) . 30
Bibliography . 37

Figure 1 – Test 2, Phase A: initial charge cycles . 19
Figure 2 – Test 2, Phase B: operating cycles . 20
Figure 3 – Test 3, operating cycles . 22

Table 1 – Climatic conditions (example) . 11
Table 2 – Suggested minimum values for IP and IK . 11
Table 3 – Lighting service indexes . 14
Table 4 – Radio / TV service indexes . 15
Table 5 – Refrigeration service indexes . 15
Table 6 – Testing programme . 17
Table A.1 – Data record sheet for visual inspection (example) . 25
Table B.1 – Commissioning records sheet (example) . 26
Table C.1 – Example of loads . 28
Table C.2– Example of small PV-IES loads (~50 Wp) . 28
Table C.3 – Example of medium PV-IES loads (~200 Wp) . 28
Table C.4 – Example of large PV-IES loads (~500 Wp) . 29
Table C.5 – Example of system load profile to perform test on PV-IES . 29
Table D.1 – Overview instruction sheet for daily records (example) . 30
Table D.2 – Record sheet for lighting service (example) . 32
Table D.3 – Record sheet for radio service (example) . 33
Table D.4 – Record sheet for TV service (example) . 34
Table D.5 – Record sheet for refrigeration service (example) . 35
Table D.6 – System daily quality index of service evaluation (example) . 36

– 4 – IEC TS 62257-9-6:2019 RLV © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RECOMMENDATIONS FOR SMALL RENEWABLE ENERGY
AND HYBRID SYSTEMS
FOR RURAL ELECTRIFICATION –
Part 9-6: Integrated systems – Recommendations for selection
of Photovoltaic Individual Electrification Systems (PV-IES)

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 thi
...