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Measuring degradation rates without irradiance data

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6 Author(s)
Steve Pulver ; University of Arizona, Tucson, USA ; Daniel Cormode ; Alex Cronin ; Dirk Jordan
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A method to report photovoltaic (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 using a Bayesian statistical analysis. This approach is verified 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.

Published in:

Photovoltaic Specialists Conference (PVSC), 2010 35th IEEE

Date of Conference:

20-25 June 2010