The ambitious 20-20-20 targets of the European Union have been fostering the development of several projects aiming to help to comply with these goals. Storage-enabled sustainable energy (SENSIBLE) for buildings and communities is a Horizon 2020 funded innovation action aiming at integrating small-scale electrochemical, electromechanical and thermal storage technologies, together with distributed renewable energy sources, into distribution grid, homes and buildings. One of the main objectives of the Portuguese SENSIBLE demonstrator is to test the islanding operation of a low voltage (LV) with grid-embedded storage devices. This study presents the short-circuit studies that were performed for the distributed resource island system. For that purpose, the actual secondary substation LV grid was modelled with MATLAB Simulink software, with real-grid data provided by the DSO and with the grid-embedded storage models provided by the manufacturers. The studies were performed for all foreseeable configurations (parallel and island) to ensure clearing of faulted conditions, and with different load scenarios.