Products & Services

SolarBuyer provides a comprehensive range of products and services to manage product risk and quality from the early stages of project development through installation and operation of the product in the field.

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Field Degradation Assessments

SolarBuyer supports system owners needing to understand and evaluate the power degradation over time in key system components – and correlate the results to time-of-manufacture diligence and quality assurance also available from SolarBuyer.

Most system performance estimates assume linear degradation rates that are uniform across all PV module types and brands.  Most estimates assume low degradation rates (0.5 to 0.8%/yr).  However, evidence from recent studies shows that actual degradation rates are variable across manufacturers – ranging anywhere from 0.5 to over 3%/yr – and degradation rates for the poorer quality modules may not be linear over time. Higher quality modules will degrade less over time; poor quality modules will degrade more over time.

SolarBuyer started gathering product quality data in 2011 which can now be used to correlate with observed degradation in maturing systems.  Identifying correlations can:

  • Provide more accurate valuations of existing systems
  • Support the ongoing work of asset managers
  • Improve the accuracy of performance forecasts
  • Enable better forecasting for specific module types
  • Drive focused improvements in quality

SolarBuyer applies evaluation protocols based on ASTM E2848 – Standard Test Method for Reporting Photovoltaic Non-Concentrator System Performance.