A simple and economical system that allows one to obtain the characteristic I-V curve in solar cells is presented. It is a computer-controlled system suitable as an instrumentation project for students who are learning about photovoltaic systems. This system is based on the use of an R-3R ladder circuit as a variable resistive load for a solar cell and is controlled by a microcontroller system connected to a PC. The system allows us to generate the I-V curve and calculates the parameters I sc , V oc , P max .
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