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This paper provides a simulation model of the hybrid system devices and of the inverter energy management. These devices comprise wind and PV sources with PEM fuel cell storage. A different converter is also needed in order to control the power flow from these elements and to maintain required bus voltage. A non ideal averaged model of the PWM-switch is a useful method for modeling pulse with modulated converters. The advantages of the proposed averaged model are mainly taking into account the semiconductors non linearity and estimating with precision the power losses in the different circuit devices. Therefore we can evaluate energy losses in the system during the unit sizing process. The mathematical and electrical models of the proposed system are developed and implemented in the MATLAB / SIMULINK. [ABSTRACT FROM AUTHOR]