Heteroscedastic linear model based reliability evaluation for solar cell degradation testing

Solar cell is the basic component of satellite photovoltaic panels with complicated redundant system structure. Its reliability plays an important role in the system, and its performance shows a degradation trend over time. In this paper, study is conducted for the solar cell degradation modeling and reliability analysis based on practical testing results. Specifically, we illustrate an accelerated test for the attenuation ratio character test under different accumulative irradiation levels, focusing on the heteroscedasticity of the collected testing data. A heteroscedastic linear model is proposed, and the reliability of the solar cell is expressed by some pivot variables. Based on the pivot expression of the parameters of the heteroscedastic linear model, we can get its life distribution. A numerical example is shown for the purpose of illustration.