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BS EN IEC 62892:2019

BS EN IEC 62892:2019

$142.49

Extended thermal cycling of PV modules. Test procedure

Published By Publication Date Number of Pages
BSI 2019 24
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This document defines a test sequence that extends the thermal cycling test of IEC 61215-2. It is intended to differentiate PV modules with improved durability to thermal cycling and evaluate modules for deployment in locations most susceptible to thermal cycling type stress1. This document is based on the ability for 95 % of the modules represented by the samples submitted for this test to pass an equivalency of 500 thermal cycles, as defined in IEC 61215-2:2016, 4.11.3, with a maximum power degradation of less than 5 %. Provisions are also provided to reduce overall test time by increasing the maximum cycle temperature and/or the number of modules submitted for test.

The test procedure in this document was developed based on analysis of the stress on tin-lead solder bonds on crystalline silicon solar cells in a glass superstrate type package. Changes to lead-free solder have an effect on the acceleration factors but not enough to change the overall results of this test. Monolithic type modules with integral cell interconnection do not suffer from this specific type of stress but there are still electrical connections within the module, for example between the integrated cell circuit and the module bus bars, that may be subject to wear out from thermal cycling. Flexible modules (without glass) are not stressed in the same way as those with glass superstrates or substrates, therefore use of the equivalency factor employed in this document may not be applicable to these modules.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 English
CONTENTS
8 FOREWORD
10 INTRODUCTION
11 1 Scope
2 Normative references
12 3 Terms and definitions
4 Sampling
5 Marking and documentation
13 6 Modifications
7 Test procedure
7.1 Initial evaluations
7.2 Thermal cycling test
7.2.1 Purpose
7.2.2 Apparatus
7.2.3 Procedure
14 7.3 Final evaluations
Tables
Table 1 ā€“ Number of required thermal cycles, NR
15 7.4 Requirements
8 Reporting
16 Annex A (normative)Calculation of the required number of thermal cycles
Figures
Figure A.1 ā€“ Number of equivalent cycles as a function of maximum cycle temperature over maximum module operating temperature
17 Figure A.2 ā€“ Survivorship plot for a Weibull distribution with a shape parameter of 6 and a survivorship probability of 95 % at 500 cycles
18 Table A.1 ā€“ Effect of sample size on test time
19 Annex B (informative)Acceleration factors based on deployed climate
Figure B.1 ā€“ Plot of module cell temperature over the course of one day to illustrate the maximum temperature, maximum temperature change and temperature reversal terms
20 Figure B.2 ā€“ Combination of factors that indicate extended thermal cycling is advised for a specific location
Table B.1 ā€“ Cell temperature factors
21 Table B.2 ā€“ Module and mounting specific model parameters
22 Bibliography

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BS EN IEC 62892:2019
$142.49