Analysis of Measurement Reproducibility for Photovoltaic Modules Under Outdoor Test Conditions

Reproducibility of measurement for photovoltaic modules under outdoor test conditions is critical for performance evaluation of photovoltaic modules in the field. However, the literature related to measurement reproducibility for photovoltaic modules in outdoor test is still scarce. In this paper, measurement reproducibility of electrical parameters corrected to standard test conditions of photovoltaic modules is investigated for the first time. The results indicate that the value of measurement reproducibility in outdoor test is generally higher compared with that in indoor test. Moreover, it is found that the reproducibility value of maximum power voltage is the largest, followed by short circuit current, open circuit voltage and maximum power current, and reproducibility value of maximum power is the smallest. The obtained results in this paper provides a preliminary insight into on-site performance degradation determination for photovoltaic modules.