Field Measurements of Pv Module Performance Using a Handy Tool

Si based PV technology is now matured and operating life of PV module in the range of 20 to 30 years is guaranteed. During this period, many times, it is required to find out the health of the PV module in the field in order to estimate the performance degradation after certain time period. This paper is concerned with field testing of the performance of PV panels, using a very handy tool, for evaluation of the effect of varying atmospheric conditions on device performance, i.e. to reveal the characteristics of PV modules in actual conditions. The issues that are of primary interest in these field tests are the module ratings, the modules' response to extreme weather conditions, and the possibility of performance degradation during long-term outdoor usage. The paper describes the preparation of the measurements including realization of the entire measurement system, which is in form of an automatic small size, easy to carry and usable handy tool. The most important part of the measurements is the IV-curve readings, and the construction of a functional IV-measurement system. Other part of the work includes the selection of a functioning sensor lineup and the programming of the data acquisition system (DAS). Environmental measurements are planned in a way that it facilitates the quality control of the measured IV-data as well as general analysis of the meteorological variables.