The temperature effect on photovoltaic modules is usually quantified by means of some coefficients relating the variations of the open‐circuit voltage, of the short‐circuit current, and of the maximum power to temperature changes. In this paper, comprehensive experimental guidelines to estimate the temperature coefficients when measurements are performed outdoors are given. In addition, a correction procedure is applied to the short‐circuit current to cancel out the influence of the fluctuations in the irradiance level. The experimental results shown in this paper refer to several single‐crystalline silicon modules that have been operating for 21 years. Consequently, the estimated values of the temperature coefficients also account for module ageing processes. The coefficients of determination achieved in the case of the temperature coefficients of the open‐circuit voltage and the maximum power are very close to one. Results concerning the temperature coefficients of the short‐circuit current are also suitable if they are previously corrected.

中文翻译：

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室外条件下退化的晶体硅光伏组件的温度系数

通常通过一些与开路电压，短路电流以及最大功率随温度变化的变化相关的系数来量化温度对光伏模块的影响。在本文中，给出了在户外进行测量时估算温度系数的综合实验指南。此外，对短路电流采用校正程序以消除辐照度波动的影响。本文显示的实验结果涉及已经运行21年的几种单晶硅模块。因此，温度系数的估计值也说明了模块的老化过程。在开路电压和最大功率的温度系数的情况下获得的确定系数非常接近1。如果事先校正，则有关短路电流温度系数的结果也适用。