CONCLUSION This articlepresentedthe simulation ofapv pumping system with real values of climatic conditions to verify the effect of the climate and geographical situation. As a first step, simple modelsare usedfor each stage of thechain in order to simulate the operation of the whole PV pumping system. Some techniques,the P&OandSPWM, have been introduced in order to optimize the performances of the system. These improvements were quantified through the flow of water which is increased 54% depending on the meteorological conditions. The next step is to validate the simulations results with the experience and improve the models in order to get more preciseperformanceprediction.