nrs 052-2-2 - fotovoltaico

7/30/2019 NRS 052-2-2 - Fotovoltaico

1/13

ISBN 978-0-626-26171-9 SANS 959-2-2:2012Edition 1

NRS 052-2-2:2012Edition 2

SOUTH AFRICAN NATIONAL STANDARD

Photovoltaic systems for use in individualhomes, schools and clinics

Part 2-2: Test procedures for maincomponents Batteries

This national standard is the identical implementation of NRS 052-2-2:2012 and isadopted in terms of a Memorandum of Agreement between the Electricity SuppliersLiaison Committee and the SABS Standards Division.

Published by SABS Standards Division1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568

www.sabs.co.za SABS


2/13

SANS 959-2-2:2012Edition 1NRS 052-2-2:2012Edition 2

Table of changesChange No. Date Scope

Foreword

This South African standard was prepared by a working group of the Electricity Suppliers LiaisonCommittee and adopted by National Committee TC 69, Power electronics and alternative energy conversion , in accordance with procedures of the SABS Standards Division, in compliance with

annex 3 of the WTO/TBT agreement.

The adoption has been done in terms of a Memorandum of Agreement between the ElectricitySuppliers Liaison Committee and the SABS Standards Division.

This document was published in xxxxx 2012.


3/13

NRS 052-2-2:2012

Edition 2

PHOTOVOLTAIC SYSTEMS FOR USE ININDIVIDUAL HOMES, SCHOOLS AND

CLINICS

Part 2: Test procedures for main components

Section 2: Batteries

N R S


4/13

This specification is issued bythe Standardization Section, Eskom,

on behalf of theUser Group given in the foreword.

Table of changesChange No. Date Text affected

Correspondence to be directed to Printed and electronic copies obtainable from

The NRS Projects Manager The SABS Standards DivisionStandardization Section Private Bag X191Industry Association Resource Centre Pretoria 0001EskomPrivate Bag X13Halfway House 1685

Telephone : (011) 651 6832 Telephone : (012) 428-7911Fax : (011) 651 6827 Fax : (012) 344-1568E-mail : [email protected] E-mail : [email protected] : http://www.nrs.eskom.co.za Website : http://www.sabs.co.za

COPYRIGHT RESERVED

Printed in the Republic of South Africaby the SABS Standards Division

1 Dr Lategan Road, Groenkloof, Pretoria


5/13

NRS 052-2-2:2012

Foreword

This section of NRS 052-2 was prepared on behalf of the Electricity Suppliers Liaison Committee(ESLC) and approved by it for use by supply authorities and other users.

This section of NRS 052-2 was prepared by a working group which, at the time of publication,comprised the following members:

D Banks (Chairperson) Restio EnergyD A Byker Tshwane ElectricityW de Klerk TelkomL Drotsche Eskom Western Cape Region (Brackenfell)G Gentles Eskom Non-Grid ElectrificationR Henderson EskomT Jacobs Eskom Western Cape Region (Brackenfell)S Khoza Department of EnergyC Meyer SABSC Purcell Restio EnergyV Sewchand (Project Leader) Technology StandardizationS v d Merwe Nelson Mandela Metropolitan Municipality

A Manufacturers Interest Group (MIG) was consulted on the contents of this section of NRS 052-2and its comments were incorporated where the working group was in agreement. The MIGcomprised the following members:

U Klingenberg Photovoltaic Suppliers and Manufacturers Association

This edition supersedes NRS 052-2-2:1999 (first edition).

NRS 052 consists of the following parts and sections, under the general title Photovoltaic systems for use in individual homes, schools and clinics :

Part 1: Standardized requirements applicable to off-grid individual homes, schools and clinics.

Part 2: Test procedures for main components.

Section 1: Photovoltaic modules.Section 2: Batteries.Section 3: Regulators, charge controllers and maximum power point trackers

(MPPTs).Section 4: Inverters.Section 5: Luminaires.

Part 3: Standardized requirements applicable to the installation and maintenance of off-grid systems in individual homes, schools and clinics.


6/13

NRS 052-2-2:2012

Introduction

This section of NRS 052-2 has been developed to standardize the testing of batteries to be utilizedin the solar home systems programme and the school and clinic electrification programmes asenvisaged in NRS 052-1.

The tests contained in this section of NRS 052-2 are intended to verify compliance with therequirements in 4.4 in NRS 052-1:2012. Although intended to test batteries used in systems ofnominal d.c. voltage 12 V with maximum currents of up to 20 A, the tests can be adapted to testand characterize lead-acid batteries of other nominal voltages used in photovoltaic systems. Whenbatteries of higher nominal voltages are tested, for example, 24 V, 36 V and 48 V, the testparameters will need to be revised and rescaled.

The test procedures were based on lead-acid batteries that are designed to suit the daily cyclingand deep discharge associated with photovoltaic (PV) system applications.

Keywords

batteries, electronic power systems, IPAP2, photovoltaic systems, solar power.


7/13

1 NRS 052-2-2:2012

Contents

Page

1 Scope...................................................................................................................................... 3

2 Normative references.............................................................................................................. 3

3 Terms, definitions and abbreviations ...................................................................................... 4

4 Inspection and tests ................................................................................................................ 44.1 General........................................................................................................................... 44.2 Accuracy of measuring instruments ............................................................................... 44.3 Preparation and maintenance of tests samples ............................................................. 44.4 Documentation ............................................................................................................... 44.5 Charge retention............................................................................................................. 44.6 Cycle endurance test...................................................................................................... 44.7 Charge efficiency test ..................................................................................................... 44.8 Visual inspection............................................................................................................. 44.9 Capacity test ................................................................................................................... 44.10 Mechanical endurance test ............................................................................................ 54.11 Cycle endurance test in extreme PV applications.......................................................... 5

Bibliography ............................................................................................................................... 6


8/13

NRS 052-2-2:2012 2

This page intentionally left blank


9/13

3 NRS 052-2-2:2012

PHOTOVOLTAIC SYSTEMS FOR USE IN INDIVIDUAL HOMES,SCHOOLS AND CLINICS

Part 2: Test procedures for main components

Section 2: Batteries

1 Scope

1.1 This section of NRS 052-2 specifies test procedures for batteries for use in photovoltaicsystems of nominal d.c. voltage 12 V and maximum currents of up to 20 A.

1.2 The test procedures can be adapted for batteries of higher nominal d.c. voltages, for example,24 V, 36 V and 48 V, for use in photovoltaic systems. In such cases the parameters to which thebatteries are tested will be revised and rescaled.

NOTE The tests listed in this section of NRS 052-2 do not replace other tests that might be needed to confirmcompliance with NRS 052-1 or other compulsory battery standards. In particular, the tests in this section ofNRS 052-2 do not deal with safety or issues covered by SANS 60896-11, SANS 60896-21, or SANS 60896-22.

1.3 The objective of the test procedures in this section of NRS 052-2 is to verify compliance withthe requirements specified in NRS 052-1.

2 Normative references

The following documents contain provisions which, through reference in this text, constituteprovisions of this section of NRS 052-2. All documents are subject to revision and, since anyreference to a document is deemed to be a reference to the latest edition of that document, partiesto agreements based on this specification are encouraged to take steps to ensure the use of themost recent editions of the documents listed below. Information on currently valid national andinternational standards can be obtained from the SABS Standards Division.

NOTE In the case of conflict between any of the following standards and specifications and this section ofNRS 052-2, the requirements of this section of NRS 052-2 take precedence.

IEC 62093, Balance-of-system components for photovoltaic systems Design qualification natural environments.

NRS 052-1, Photovoltaic systems for use in individual homes, schools and clinics Part 1: Standardized requirements applicable to off-grid individual homes, schools and clinics.

SANS 61427/IEC 61427, Secondary cells and batteries for photovoltaic energy systems (PVES) Part 1: General requirements and methods of test.


10/13

NRS 052-2-2:2012 4

3 Terms, definitions and abbreviations

For the purposes of this section of NRS 052-2, the terms, definitions and abbreviations given inNRS 052-1 apply.

4 Inspection and tests

4.1 General

Batteries, except where otherwise required in this section of NRS 052-2, shall be tested inaccordance with the procedures given in IEC 62093.

4.2 Accuracy of measuring instruments

The requirements of IEC 62093 apply.

4.3 Preparation and maintenance of tests samples

The procedures in clauses 3 and 4 in IEC 62093:2005 apply. Follow the test sequence given inclause 6 in IEC 62093:2005.

4.4 Documentation

Check documentation in accordance with clause 5 in IEC 62093:2005.

4.5 Charge retention

Test batteries for charge retention in accordance with IEC 62093. As an acceptance criterion thecharge retention of the battery shall comply with the requirements in 4.3.4.5 in NRS 052-1:2012.

4.6 Cycle endurance test

Test batteries for cycle endurance in accordance with IEC 62093 (which refers to IEC 61427(SANS 61427)).

4.7 Charge efficiency test

Determine charge efficiency in accordance with IEC 62093. Determine the charge efficiency of thebattery at 20 C in accordance with SANS 61427. For this test, discharge the battery at I 50 andrecharge at I 120 .

4.8 Visual inspection

Carry out a visual inspection in accordance with IEC 62093 to verify compliance of the battery withthe requirements in 4.2.1.2.1 in NRS 052-1:2012.

4.9 Capacity test

Test batteries for capacity in accordance with IEC 62093.


11/13

5 NRS 052-2-2:2012

4.10 Mechanical endurance test

Batteries may be tested for:

a) protection against mechanical impact in accordance with IEC 62093;

b) shipping vibration in accordance with IEC 62093;

c) shock in accordance with IEC 62093;

d) thermal cycling in accordance with IEC 62093; and

e) robustness of terminals in accordance with IEC 62093.

4.11 Cycle endurance test in extreme PV applications

Batteries may be tested for typical PV cycle endurance in accordance with SANS 61427.


12/13

NRS 052-2-2:2012 6

Bibliography

European Commission, 1998, Universal technical standard for solar home systems .

Hankins, M, 1991. Guide for planning and installing solar electric lighting systems in rural Africa .London: Commonwealth Science Council and Nairobi: Motif Creative Acts, Ltd.

NOGSCAAI7:1999, Technical specification for the main components for photovoltaic systems for schools. Johannesburg: Eskom Non-Grid Electrification.

Purcell C.J de V. 1991. Battery performance characteristics in stand-alone photovoltaic systems ,Energy for Development Research Centre: University of Cape Town.

RAPS design manual:1992, Remote area power supply (RAPS) design manual. Prepared for theDepartment of Minerals and Energy by the Energy for Development Research Centre, University ofCape Town.

Woodworth, J.R, et al, 1994. Evaluation of the batteries and charge controllers in small stand-alone photovoltaic systems . Hawaii: First World Conference on Photovoltaic Energy Conversion(WCPEC).

SABS


13/13

SABS Standards Division

The objective of the SABS Standards Division is to develop, promote and maintain South AfricanNational Standards. This objective is incorporated in the Standards Act, 2008 (Act No. 8 of 2008).

Amendments and Revisions

South African National Standards are updated by amendment or revision. Users of South AfricanNational Standards should ensure that they possess the latest amendments or editions.

The SABS continuously strives to improve the quality of its products and services and wouldtherefore be grateful if anyone finding an inaccuracy or ambiguity while using this standard wouldinform the secretary of the technical committee responsible, the identity of which can be found inthe foreword.Tel: +27 (0) 12 428 6666 Fax: +27 (0) 12 428 6928

The SABS offers an individual notification service, which ensures that subscribers automaticallyreceive notification regarding amendments and revisions to South African National Standards.Tel: +27 (0) 12 428 6883 Fax: +27 (0) 12 428 6928 E-mail: [email protected]

Buying Standards

Contact the Sales Office for South African and international standards, which are available in bothelectronic and hardcopy format.Tel: +27 (0) 12 428 6883 Fax: +27 (0) 12 428 6928 E-mail: [email protected] South African National Standards are also available online from the SABS websitehttp://www.sabs.co.za

Information on Standards

The Standards Information Centre provides a wide range of standards-related information on bothnational and international standards, and is the official WTO/TBT enquiry point for South Africa. TheCentre also offers an individual updating service called INFOPLUS, which ensures that subscribersautomatically receive notification regarding amendments to, and revisions of, internationalstandards.Tel: +27 (0) 12 428 6666 Fax: +27 (0) 12 428 6928 E-mail: [email protected]

Copyright

The copyright in a South African National Standard or any other publication published by the SABSStandards Division vests in the SABS. Unless exemption has been granted, no extract may bereproduced, stored in a retrieval system or transmitted in any form or by any means without priorwritten permission from the SABS Standards Division. This does not preclude the free use, in thecourse of implementing the standard, of necessary details such as symbols, and size, type or gradedesignations. If these details are to be used for any purpose other than implementation, prior writtenpermission must be obtained.

Details and advice can be obtained from the Senior Manager.Tel: +27 (0) 12 428 6666 Fax: +27 (0) 12 428 6928 E-mail: [email protected]
mailto:[email protected]:[email protected]:[email protected]://www.sabs.co.za/http://www.sabs.co.za/mailto:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]://www.sabs.co.za/mailto:[email protected]:[email protected]

nrs 052-2-2 - fotovoltaico

Documents