The characterization at indoor conditions is insufficient to study the behavior of PV generators physical parameters depending on environmental factors. For this purpose, current-voltage (I-V) characteristics measurements of a monocrystalline PV module are taken using an appropriate I-V curve tracer previously designed for sampling measurements under real operating conditions. In order to accurately extract the PV generator physical parameters, a new method is implemented. The proposed method is based on the combination of a developed genetic algorithm and the simulated annealing algorithm. The evolution of the physical parameters of the single diode model as a function of temperature is presented and discussed. Empirical laws reported in the literature that describe the evolution of the physical parameters with temperature are checked with the extraction results.