International audienceThe sizing and techno-economic optimisation of a stand alone hybrid PV/wind system with battery storage is presented in this paper. The main objective of the present study is to find the optimum size of system (optimum system configurations), able to fulfil the energy requirements of a given load distribution, for three sites located at Corsica island (at three sites in Corsica island) and to analyze the impact of different parameters on the system size. In this context, an optimization sizing model is developed. It consists of three submodels; system components submodels, technical submodel, based on the loss of power supply probability (LPSP), and the economical submodel based on the levelised cost of energy (LCE). Applying this developed model, a set of configurations meeting the desired LPSP is obtained. The configuration, with the lowest LCE, presents the optimal one. Analysing the optimal system configurations used to satisfy the requirements of typical residential home (3 kWh/day), a significant reduction in system size is observed as the available renewable potential increases leading to a considerable decrease in LCE (case of Cape corse site). The two days storage capacity are found the best for the optimal configuration with the lowest LCE. On the other hand, for low energy requirements, the LCE is found relatively high and decreases sharply with the increase in load. However, for low LPSP values, the LCE is found to rise sharply for a little increase in LPSP. Finally, Cape corse is found the best candidate site with minimum LCE

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