Optimal electric power of the PV generator, which is obtained as an output result, should meet the demands of the consumers throughout the whole observed period. However, the defined objective function should not be confused with defining the maximum area that can be economically irrigated, Amax, because the optimizing model was developed for the purpose of defining the optimal size of the PV generator. Further research showed that the same model could also be used for defining Amax in the manner described in the work.