Conclusions
In this study a dynamic simulation tool combining the models of the water demand, the solar PV power and pumping system was developed in order to be used for quick design and design validation. According to the achieved results the following conclusion can be pointed out:
The sizing of photovoltaic water pumping systems for irrigation is extremely affected by the dynamic character of the water demand and collectable solar energy. In order to define the worst condition on the basis of which the system is sized, the lowest ratio between required hydraulic energy and available solar radiation has to be considered.
The assessment of the overall system efficiency is relevant to optimally size the PV array power peak avoiding both system failure and economic losses. Summarizes in a steady value the dynamic efficiency of the system components and the optimal value can only be set through system dynamic simulations verifying the match between pumped water and water demand.
Preliminary economic analysis based on the initial investment costs showed that AC pump powered by fixed PV array represent the most cost effective solution for water pumping.