Abstract
In recent years, photovoltaic (PV) systems have been installed rapidly in the world. However, there is delay in the practical application of fault detection for PV systems. In this study, the temperature of bypass diodes (BD) mounted on P V modules was measured for simple and practical fault detection. The temperature of the BD of Module 31 was higher than other modules and a large current passed through one of the BD. Measuring a BD temperature is easier than conventional methods. It is possible to detect failure without a system shutdown. Moreover, we tried to evaluate the distribution of temperature of terminal box using the heat conduction equations. The evaluated results agreed approximately with measured results.
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