Solar tool from NREL accurately calculates panel degradation rates

RdTools standardizes calculation methods providing better module performance and degradation analysis


The National Renewable Energy Laboratory (NREL) is the only Federally owned and funded laboratory dedicated to the research, development, commercialization and deployment of renewable energy /NREL

In the solar industry, accurately predicting the longevity of photovoltaic (PV) panels is essential to increase energy production, lower costs, and raise investor and consumer confidence.

A new software package developed by the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) and industry partners SunPower and kWh Analytics is making the measurement of PV system expected lifetime performance more reliable, consistent, and accurate.

RdTools combines best practices with years of NREL degradation research to deliver new methodologies that change how solar field production data is evaluated.

The software package makes it possible to accurately evaluate PV systems faster, despite common challenges with performance data.

PV module and system degradation have been historically difficult to assess in the PV industry. Field performance can be impacted by many confounding variables including ambient weather conditions, seasonal changes, sensor drift, and soiling, to name a few. Extracting system degradation rates previously required years of production data, high accuracy instrumentation, and the presence of staff scientists to conduct the evaluation.

The RdTools software package solves these problems by providing a robust and validated software toolkit for calculating and analyzing PV system performance and degradation over time.

The tool can deliver valuable insights for manufacturers, engineers, investors and owners who have a stake in system performance, such as identifying under-performing sub-arrays, and quantifying system performance relative to neighboring systems.

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