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In order to solve the photovoltaic PV array power plant in the failure caused by various reasons, can not be found in time, the maintenance problem caused large economic losses, put forward through the installation of a wireless temperature sensor in the PV component of the junction box, a new method of monitoring the temperature of the bypass diode indirect monitoring failure component, this method can not effect of structure of PV module under the timely discovery, photovoltaic PV array in the failure location. Detail processing on the formation of hot spot effect and the method of measuring the temperature of the contact and abnormal data, the hardware circuit of the temperature acquisition and wireless transmission system design, the circuit is simple and reliable, low cost and easy to implement, acquisition accuracy meets the design requirements. And the preparation of the PC terminal monitoring system program, the occlusion is verified by failure of PV components, results show that the PV array temperature measurement component failure monitoring system based on temperature detection results are reliable, easy to use.