In the current paper is presented a technical and economic study for integrating a high-power photovoltaic generator into an existing irrigation system. In the first part the modelling of each component of the existing irrigation system is presented (Hydraulic network, submersible pump, induction motor and the diesel generator). In the second part the modelling of a high-power generator on a horizontal axis N-S solar tracker. Finally, in the last part the payback period of the high-power PV generator is calculated, considering just the price of the diesel used by the generator to extract and pump the same volume of water.

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