The optimal sizing of stand-alone renewable H2-based microgrids requires the load demand to be reliably satisfied by means of local renewable energy supported by a hybrid battery/hydrogen storage unit, while minimizing the system costs. However, this task is challenging because of the high number of components that have to be installed and operated. In this work, an MILP optimization framework has been developed and applied to the off-grid village of Ginostra (on the Stromboli island, Italy), which is a good example of several other insular sites throughout the Mediterranean area. The professor Paolo Marocco, Domenico Ferrero, Emanuele Martelli, Massimo Santarelli and Andrea Lanzini have signed the scientific publication, released on Energy Conversion and Management of October 2021.