Degradation assessment of PV modules by combining outdoor and indoor test results

This paper presents a 7-year longitudinal study on a batch of photovoltaic (PV) modules. It introduces a combined indoor-outdoor approach for predicting their performance. This method not only effectively reduces measurement uncertainties but also improves the fit between the data and linear degradation models. In addition, this paper proposes a correction method to enhance the accuracy of outdoor testing. The study offers a novel perspective for the lifespan prediction of photovoltaic modules.