BSI PD IEC/TS 62788-7-2:2017
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Measurement procedures for materials used in photovoltaic modules – Environmental exposures. Accelerated weathering tests of polymeric materials
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 32 |
This part of IEC 62788 defines test procedures to characterize the weatherability of polymeric component materials used in photovoltaic (PV) modules or systems. The methods in this document have been focused on polymeric backsheets and encapsulants, but may be applied to other materials; however, these were not verified as part of the preparation.
This document includes a suite of artificial weathering exposures, consisting of a steady-state application of simulated solar irradiance, temperature, and humidity conditions maintained at stable levels through the weathering test. Cyclic stresses, including thermal and wet/dry cycles are left for future specifications.
Exposures in this document are intended for reference by other standards and as a tool to support research and product development for PV components and modules. Different exposures may be used to target specific climate/mounting configurations, with the specifics of how to apply the exposures left to those standards (e.g. component characterization standards, module qualification standards).
An informative annex including parametric descriptions of a range of climate/application configurations used in developing the exposure suites is provided as a reference.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | CONTENTS |
| 8 | FOREWORD |
| 10 | 1 Scope 2 Normative references |
| 11 | 3 Terms and definitions |
| 12 | 4 Artificial weathering exposures 4.1 General |
| 13 | 4.2 Method A: filtered xenon arc with daylight filters 4.2.1 General Figures Figure 1 – Spectral irradiance power distributions: solar, xenon arc, fluorescent UV |
| 14 | 4.2.2 Light source, irradiance levels 4.2.3 Temperature Tables Table 1 – Method A exposure conditions |
| 15 | 4.2.4 Moisture (relative humidity, RH) 4.2.5 Length of exposure 4.3 Method B: Fluorescent UVA-340 4.3.1 General |
| 16 | 4.3.2 Light source, irradiance levels 4.3.3 Temperature 4.3.4 Relative humidity 4.3.5 Length of exposure Table 2 – Method B exposure conditions |
| 17 | 5 Weathering specimens 5.1 General 5.2 Specimen constructions 5.2.1 General 5.2.2 Single film or sheet 5.2.3 Design specific laminate 5.2.4 Single component with representative filter 5.2.5 Design specific laminate with separable film |
| 18 | 6 Reporting – artificial weathering exposure Table 3 – Weathering specimen types – examples |
| 20 | Annex A (informative) Characterizing the conditions of polymeric components in fielded modules A.1 General A.2 Climate data and models for module temperature A.2.1 General A.2.2 Irradiance levels Figure A.1 – Module temperature, UV irradiance, and environmental temperaturefor a representative July day in Phoenix, AZ |
| 21 | A.2.3 Temperature Figure A.2 – (A) Hourly daytime temperatures for Miami over one year and (B) Annual hourly daytime temperatures for Miami, plotted as a cumulative distribution Table A.1 – Average solar radiant dosage levels for benchmark locations, 2000-2015 |
| 22 | A.2.4 Humidity Figure A.3 – RH for a representative day in Miami, Florida |
| 23 | A.2.5 Backside irradiance Figure A.4 – Relative humidity values |
| 24 | A.2.6 Summary Figure A.5 – Measured solar irradiance on front and back of PV module |
| 25 | A.3 Data from module arrays Table A.2 – Summary of estimated module conditions from climate data Table A.3 – Measured annual temperature data for fielded modules |
| 26 | Annex B (informative) Development of the test methods in this document and recommendations for use B.1 General B.2 UV exposure for components compared to PV module standards B.3 Light source selection B.4 Irradiance levels B.4.1 Method for specification |
| 27 | B.4.2 Irradiance set-points B.4.3 Length of exposure, dosage levels Table B.1 – Reference irradiance levels |
| 28 | Table B.2 – 1-year front side dosage levels for selected outdoor locations compared to 1 000 h laboratory exposures in this document |
| 29 | B.5 Exposure temperature and relative humidity B.5.1 Target set points B.5.2 Temperature set points in Methods A and B |
| 30 | Bibliography |
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BSI PD IEC/TS 62788-7-2:2017
Measurement procedures for materials used in photovoltaic modules – Environmental exposures. Accelerated weathering tests of…
