Three labs at EPFL which are bound through CRETE (Centre de Recherche et d’Enseignement en Technologies Energétiques) have oriented some of their research activities on integrated fuel cells equipment. Technological and systemic optimisation research programs are currently under way, mainly in the field of electro-chemical materials, of systemic approach, and in the field of optimising the static conversion system for injection in an electrical network. Efficiency calculations and comparisons are given.