Renewable energy and hybrid systems for rural electrification - Part 9-8: Integrated systems - Requirements for stand-alone renewable energy products with power ratings less than or equal to 350 W

IEC 62257-9-8:2020 provides baseline requirements for quality, durability and truth in advertising to protect consumers of off-grid renewable energy products. Evaluation of these requirements is based on tests described in IEC TS 62257-9-5. This document can be used alone or in conjunction with other international standards that address the safety and durability of components of off-grid renewable energy products.

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Published
Publication Date
09-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
10-Jun-2020
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IEC TS 62257-9-8:2020 - Renewable energy and hybrid systems for rural electrification - Part 9-8: Integrated systems - Requirements for stand-alone renewable energy products with power ratings less than or equal to 350 W
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IEC TS 62257-9-8
Edition 1.0 2020-06
TECHNICAL
SPECIFICATION
Renewable energy and hybrid systems for rural electrification –
Part 9-8: Integrated systems – Requirements for stand-alone renewable energy
products with power ratings less than or equal to 350 W
IEC TS 62257-9-8:2020-06(en)
---------------------- Page: 1 ----------------------
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IEC TS 62257-9-8
Edition 1.0 2020-06
TECHNICAL
SPECIFICATION
Renewable energy and hybrid systems for rural electrification –
Part 9-8: Integrated systems – Requirements for stand-alone renewable energy
products with power ratings less than or equal to 350 W
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160 ISBN 978-2-8322-8239-7

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62257-9-8:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 9

3 Terms and definitions .................................................................................................... 10

4 Test requirements .......................................................................................................... 15

4.1 General ................................................................................................................. 15

4.2 Initial testing requirements .................................................................................... 17

4.2.1 General ......................................................................................................... 17

4.2.2 Quality test method ........................................................................................ 17

4.2.3 Accelerated verification method ..................................................................... 17

4.2.4 Pay-as-you-go targeted testing ...................................................................... 18

4.2.5 Product families ............................................................................................. 19

4.2.6 Similar products ............................................................................................. 19

4.2.7 Verification of product identicality .................................................................. 20

4.2.8 Reference to other standards ......................................................................... 20

4.3 Recurring testing requirements ............................................................................. 22

4.4 Retesting of non-conforming products ................................................................... 22

4.5 General testing requirements applicable to all testing pathways ............................ 23

4.5.1 General ......................................................................................................... 23

4.5.2 Exception for accessory lights ....................................................................... 23

5 Quality requirements ..................................................................................................... 24

5.1 General ................................................................................................................. 24

5.2 Truth in advertising ............................................................................................... 26

5.2.1 General ......................................................................................................... 26

5.2.2 Assessment of run time values ...................................................................... 27

5.2.3 Information and performance reporting requirements ..................................... 28

5.2.4 Fee-for service or pay-as-you-go (PAYG) metering requirements .................. 31

5.2.5 Included appliances requirements .................................................................. 31

5.2.6 Assessment of ingress protection advertisements .......................................... 31

5.3 Ports requirements................................................................................................ 32

5.3.1 General ......................................................................................................... 32

5.3.2 Voltage converters ......................................................................................... 33

5.3.3 Ports with multiple output voltages ................................................................ 33

5.3.4 Appliance voltage compatibility requirements ................................................. 33

5.3.5 Truth-in-advertising requirements .................................................................. 33

5.3.6 Functionality requirements ............................................................................. 34

5.4 Lumen maintenance .............................................................................................. 37

5.5 Health and safety .................................................................................................. 37

5.5.1 AC-DC power supply safety ........................................................................... 37

5.5.2 Hazardous substances .................................................................................. 37

5.5.3 Circuit and overload protection ...................................................................... 38

5.5.4 Wiring and connector safety .......................................................................... 38

5.5.5 Additional tests for PV modules ..................................................................... 38

5.5.6 Requirements for systems with large PV modules or arrays ........................... 41

5.6 Battery requirements ............................................................................................. 41

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IEC 62257-9-8:2020 © IEC 2020 – 3 –

5.6.1 Provision of battery specification sheets ........................................................ 41

5.6.2 Battery charge control ................................................................................... 41

5.6.3 Specific requirements for lithium-based batteries ........................................... 43

5.6.4 Battery durability ........................................................................................... 44

5.7 Quality and durability ............................................................................................ 44

5.7.1 General ......................................................................................................... 44

5.7.2 Physical and water ingress protection ............................................................ 44

5.7.3 Drop test requirements .................................................................................. 47

5.7.4 Soldering and electronics quality ................................................................... 49

5.7.5 Switch, gooseneck, connector, and moving parts durability ............................ 49

5.7.6 Strain relief durability ..................................................................................... 49

5.7.7 Outdoor cable durability (size B products only) .............................................. 49

5.7.8 PV overvoltage requirement ........................................................................... 50

5.7.9 Miswiring protection requirement ................................................................... 51

5.7.10 Requirements specific to systems with non‑plug‑and‑play connections ........... 51

5.8 Consumer information ........................................................................................... 52

5.8.1 Warranty requirements .................................................................................. 52

5.8.2 Date of manufacture ...................................................................................... 53

5.8.3 User manual requirements (size B products only) .......................................... 53

5.8.4 Component replacement methods (size B products only) ............................... 54

Annex A (normative) Testing of similar products .................................................................. 55

A.1 General ................................................................................................................. 55

A.2 Guidelines ............................................................................................................ 55

A.2.1 Visual screening ............................................................................................ 55

A.2.2 Lumen maintenance and light output ............................................................. 55

A.2.3 Charge controller testing................................................................................ 56

A.2.4 PV modules ................................................................................................... 56

A.2.5 Battery durability testing ................................................................................ 56

A.2.6 Connector durability testing ........................................................................... 56

A.2.7 Battery testing, full-battery run time, solar run time, and energy service

calculations ................................................................................................... 56

A.2.8 Miswiring protection ....................................................................................... 57

A.2.9 Output overload ............................................................................................. 57

A.2.10 PV overvoltage .............................................................................................. 57

A.2.11 Assessment of DC ports ................................................................................ 57

A.2.12 Power consumption and charging efficiency................................................... 57

A.2.13 Voltage range ................................................................................................ 57

A.2.14 Changes to firmware or software ................................................................... 58

Annex B (normative) Partial shading test for photovoltaic modules ...................................... 59

B.1 General ................................................................................................................. 59

B.2 Equipment requirements ....................................................................................... 59

B.3 Test prerequisites ................................................................................................. 60

B.4 Procedure ............................................................................................................. 60

B.5 Calculations .......................................................................................................... 62

B.6 Pass criteria .......................................................................................................... 62

B.7 Reporting .............................................................................................................. 62

Annex C (normative) Visual screening and durability tests for photovoltaic modules ............ 64

C.1 General ................................................................................................................. 64

C.2 Durability of markings test ..................................................................................... 64

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– 4 – IEC 62257-9-8:2020 © IEC 2020

C.2.1 Equipment requirements ................................................................................ 64

C.2.2 Test prerequisites .......................................................................................... 64

C.2.3 Procedure ...................................................................................................... 64

C.3 Sharp edge test .................................................................................................... 64

C.3.1 Test prerequisites .......................................................................................... 64

C.3.2 Procedure ...................................................................................................... 65

C.4 Screw connections test ......................................................................................... 65

C.4.1 Equipment requirements ................................................................................ 65

C.4.2 Test prerequisites .......................................................................................... 65

C.4.3 Required test conditions ................................................................................ 65

C.4.4 Procedure ...................................................................................................... 65

C.5 Impact test ............................................................................................................ 67

C.5.1 Equipment requirements ................................................................................ 67

C.5.2 Test prerequisites .......................................................................................... 67

C.5.3 Procedure ...................................................................................................... 67

C.6 Bending or folding test .......................................................................................... 67

C.6.1 General ......................................................................................................... 67

C.6.2 Equipment requirements ................................................................................ 67

C.6.3 Test prerequisites .......................................................................................... 67

C.6.4 Required test conditions ................................................................................ 68

C.6.5 Procedure ...................................................................................................... 68

C.6.6 Pass criteria .................................................................................................. 68

C.7 Reporting .............................................................................................................. 68

Bibliography .......................................................................................................................... 70

Figure 1 – Example water protection warning label or instruction .......................................... 47

Figure 2 – Decision process to determine whether or not a component is subject to

the drop test ......................................................................................................................... 48

Table 1 – Summary of test requirements and alternatives – initial testing requirements to

determine compliance with Clause 5 ..................................................................................... 16

Table 2 – Summary of test requirements – recurring testing requirements to ensure

continued compliance with Clause 5 ..................................................................................... 16

Table 3 – Summary of quality requirements .......................................................................... 25

Table 4 – Sample size and renewal requirements for PV tests .............................................. 38

Table 5 – Examples of maximum current ratings ................................................................... 39

Table 6 – Default battery deep discharge protection voltage specifications ........................... 42

Table 7 – Default battery overcharge protection voltage specifications.................................. 42

Table 8 – Physical ingress protection requirements .............................................................. 45

Table 9 – Water protection requirements .............................................................................. 45

Table C.1 – Torque tests on screws per IEC 61730-2 ........................................................... 66

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IEC 62257-9-8:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RENEWABLE ENERGY AND HYBRID SYSTEMS
FOR RURAL ELECTRIFICATION –
Part 9-8: Integrated systems – Requirements for stand-alone renewable
energy products with power ratings less than or equal to 350 W
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

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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

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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

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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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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

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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.

The main task of IEC technical committees is to prepare International Standards. In exceptional

circumstances, a technical committee may propose the publication of a technical specification

when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 62257-9-8, which is a Technical Specification, has been prepared by IEC technical

committee 82: Solar photovoltaic energy systems.
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– 6 – IEC 62257-9-8:2020 © IEC 2020
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
82/1643/DTS 82/1685/RVDTS
82/1685A/RVDTS

Full information on the voting for the approval of this technical specification can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

This part of IEC 62257 is to be used in conjunction with IEC TS 62257-9-5.

A list of all parts in the IEC 62257 series, published under the general title Renewable energy

and hybrid systems for rural electrification, can be found on the IEC website.

Future standards in this series will carry the new general title as cited above. Titles of existing

standards in this series will be updated at the time of the next edition.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 8 ----------------------
IEC 62257-9-8:2020 © IEC 2020 – 7 –
INTRODUCTION

IEC 62257 (all parts) provides support and strategies for institutions involved in rural

electrification projects. It documents technical approaches for designing, building, testing, and

maintaining off-grid renewable energy and hybrid systems with AC nominal voltage below 500 V,

DC nominal voltage below 750 V and nominal power below 100 kVA.

These documents are recommendations to support buyers who want to connect with good

quality options in the market:
• to choose the right system for the right place,
• to design the system, and
• to operate and maintain the system.

These documents are focused only on technical aspects of rural off-grid electrification

concentrating on, but not specific to, developing countries. They are not considered as all

inclusive to rural electrification. The documents do not describe a range of factors that can

determine project or product success: environmental, social, economic, service capabilities,

and others. Further developments in this field could be introduced in future steps.

This consistent set of documents is best considered as a whole with different parts

corresponding to items for safety, sustainability of systems, and costs. The main objectives are

to support the capabilities of households and communities that use small renewable energy and

hybrid off-grid systems and inform organizations and institutions in the off-grid power market.

The purpose of this document is to provide baseline standards for quality, durability and truth-

in-advertising to protect consumers of stand-alone renewable energy products. This document

is specifically related to renewable energy products that are packaged and made available to

end-use consumers at the point of purchase as single, stand-alone products that do not require

additional system components to function. This document applies to products with peak power

ratings of 350 W or less. While most provisions apply to all products in this range, a few are

applicable only to products with peak power ratings greater than 10 W and less than or equal

to 350 W.

The term "stand-alone renewable energy product" is used in this document to describe this

class of products. Other equivalent terms, including "off-grid solar" or "rechargeable," are often

used by manufacturers, distributors, and other stakeholders to describe these products. Many

of these systems meet the definition of type T I (individual electrification systems with energy

storage) in IEC TS 62257-2.
The intended users of this document are:

• market support programmes that support the off-grid lighting market with financing,

consumer education, awareness, and other services;

• manufacturers and distributors that need to verify the quality and performance of products;

• bulk procurement programmes that facilitate or place large orders of products; and,

• trade regulators such as government policymakers and officials who craft and implement

trade and tax policy.

This document establishes minimum requirements for quality standards and warranty

requirements. Products are compared to specifications based on test results from

IEC TS 62257-9-5 and other information about the product. The requirements are designed to

be widely applicable across different markets, countries, and regions.
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– 8 – IEC 62257-9-8:2020 © IEC 2020
RENEWABLE ENERGY AND HYBRID SYSTEMS
FOR RURAL ELECTRIFICATION –
Part 9-8: Integrated systems – Requirements for stand-alone renewable
energy products with power ratings less than or equal to 350 W
1 Scope

This part of IEC 62257 provides baseline requirements for quality, durability and truth in

advertising to protect consumers of off-grid renewable energy products. Evaluation of these

requirements is based on tests described in IEC TS 62257-9-5. This document can be used

alone or in conjunction with other international standards that address the safety and durability

of components of off-grid renewable energy products.

This document applies to stand-alone renewable energy products having the following

characteristics:

• The products are powered by photovoltaic (PV) modules or electromechanical power

generating devices (such as dynamos), or are designed to use grid electricity to charge a

battery or other energy-storage device for off-grid use. The requirements may also be

appropriate as guidance for evaluating the quality of devices with other power sources, such

as thermoelectric generators.

• The peak power rating of the PV module or other power generating device is less than or

equal to 350 W.

• All components required to provide basic energy services are sold/installed as a kit, included

as a part of family of products as defined in 4.2.5, or
...

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