The product of the proposed research activity is a multi-source green energy system that can overcome the unpredictability of most renewable energy sources while also increasing the endurance and independence from fossil fuels. An energy storage device can be used as a temporary reserve in a redundant renewable system based on many energy sources. The proposed strategy improves resilience in variable and unpredictable environmental conditions. A small-scale prototype (target 300 W) will be designed and validated in the laboratory. In the design process, modelling is a crucial step for a successful experimental validation. Each primary source should be accurately modelled. Both low and high temperature fuel cells will be considered in a feasibility analysis based on experimental and modelling activities aimed at identifying the best solution in different case studies. Accuracy and software portability is one of the most important features to be accounted for. An inclusive simulation model of the multisource power supply, including primary sources, control units and power converters will be defined and implemented. The whole simulation model will be a fundamental tool for a first validation of the designed power supply system in terms of steady-state and dynamic performances, suitability for the targeted application and the evaluation of single fill-up range and independence from fossil fuels. Accuracy, software portability, power scalability and userinteractive functions are key features to include. A smart energy management unit will be designed to investigate, validate and compare the designed power control algorithms. The scalability of the proposed solution towards higher power levels, in terms of both the renewable sources technologies and the power system architecture, will be investigated and validated by simulation results. Figure 29 shows a simplified architecture of the multi-source power system. A multisource power system will provide the energy necessary for the management of the power load. A complete renewable generation chain could be investigated to produce hydrogen by an electrolyzer or recharge on-board batteries with solar and/or wind energy thanks to commercial photovoltaic systems and vertical wind turbines.