Simple I-V acquisition module with high side current sensing principle for real time photovoltaic measurement

Abstract

This work presents a data acquisiti on module for measurement of current voltage (I-V) characteristic of photovoltaic module based on INA219 sensor Adafruit integrated with the Atmega328 Microcontroller. The module can be used to measure the photovoltaic DC current precisely, which is controlled using a developed software interface as a data logger display. The sensor works based on the principle of high side currents sensing consists of sense and load resistor to accommodate four sensors of 3 Amps in the maximum voltage range up to 26V. The measurement result in real-time is depicted in graphical form using visual studio software. Calibration and linearity tests result an error of of 0.76% and 0.572% for currents and voltages respectively. The result of linearity test shows a value of R = 0.98 for current and voltage of PV module compare to the calibrator.