Measuring Degradation Rates Without Irradiance Data

    Research output: Contribution to conferencePaper


    A method to report PV system degradation rates without using irradiance data is demonstrated. First, a set of relative degradation rates are determined by comparing daily AC final yields from a group of PV systems relative to the average final yield of all the PV systems. Then, the difference between relative and absolute degradation rates is found from a statistical analysis. This approach isverified by comparing to methods that utilize irradiance data. This approach is significant because PV systems are often deployed without irradiance sensors, so the analysis method described here may enable measurements of degradation using data that were previously thought to be unsuitable for degradation studies.
    Original languageAmerican English
    Number of pages9
    StatePublished - 2011
    Event35th IEEE Photovoltaic Specialists Conference (PVSC '10) - Honolulu, Hawaii
    Duration: 20 Jun 201025 Jun 2010


    Conference35th IEEE Photovoltaic Specialists Conference (PVSC '10)
    CityHonolulu, Hawaii

    NREL Publication Number

    • NREL/CP-5200-47597


    • PV degradation rates


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