ASTM WK22010

    Work Item: ASTM WK22010 - New Guide for Testing Performances, Weathering and Aging of Photovoltaic Modules

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    Developed by Subcommittee: E44.09 | Committee E44 | Contact Staff Manager



    1. Scope

    1.1 ASTM encourages the definition of significant methods and procedures that provide an effective evaluation of photovoltaic module performance, with aging and weathering, including stress conditions. 1.2 In order to simplify standards for photovoltaic modules, a general framework that defines objective parameters regarding output production and lifecycle of modules is required, which includes: 1.2.1 quantifying the PV module performance decay from the global effects of extended outdoor weather exposure and induced fatigue stress; 1.2.2 determine the mechanical resistance of modules to weathering from exposure to real outdoor or artificially created conditions, including extreme weather events; 1.2.3 determine the mechanical resistance and decay of optical characteristics of glasses from exposure to real outdoor or artificially created conditions, including extreme weather events; 1.2.4 determine the effective output production of modules and the resulting decay, during the expected module lifetime in real operating conditions and/or predefined artificial weather conditions; in order to predict performance in different real weather conditions from test result parameters. 1.3 Any testing or stress procedure must satisfy three elemental requisites: publication of test or stress conditions (e.g., use of the same standards and methods and equivalent equipment), reproducibility of the test or stress (e.g., at different locations, and comparability of results (e.g., measure the same parameters or implement the same stresses). 1.3.1 Technical and geometric characteristics of reduced size modules are defined to be as close in design and function as possible to full-size modules. 1.3.2 Stress and Test equipment and methodologies are fully defined in order to ensure fully comparable results. 1.3.3 Artificial weather conditions for stress are fully defined to produce comparable results in terms of aging, weathering, and decay during the modules lifetime. 1.4 Accelerated exposure stressing is realized using simulated sunlight in predefined conditions. Testing and stressing using full-size modules are preferable, but in the case of accelerated stressing reduced size compact devices are acceptable. If the stress equipment is not large enough to accept full-size photovoltaic modules, the stress and test procedures may only be suitable for smaller test modules. 1.5 When using smaller test modules, the criteria for equivalence with components in full-size modules shall be specified. If the scalingcan influence the results, the evaluation of the influence of the factor scales must be clearly reported. 1.6 The stress and test methods do not provide for weathering studies on individual components of photovoltaic modules, but the methods can predict the influence of individual components on module performance, resistance, and lifetime. No other similar standards exist for long-term weathering of PV modules. Users are primarily PV and test equipment manufacturers.

    No other similar standards exist for long-term aging and weathering of PV modules. Users are primarily PV manufacturers and researchers. It constitutes a general guideline for Aging and Weathering testing standards and practices, including fatigue testing methodologies.


    Keywords

    photovoltaics; weathering; aging, accelerated;

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:
    11-25-2008

    Technical Contact:
    Michele Trancossi

    Status:
    Draft Under Development