With the increased compulsory usage of renewable energy resources, it is essential to efficiently use the energy produced from them. Such energy can be stored in fuel cells which work on the basis of electrolysis. A DC-DC converter is required to couple the electrolyser to the system DC bus. This paper is based on a new approach for achieving very high conversion efficiency in low-voltage high-power isolated boost DC-DC converter. The proposed DC-DC converter is realized in half-bridge topology in the rectifier side to achieve zero voltage switching for the power switches and to regulate the output voltage. Z-Source inverter is utilized to realize inversion and boost function in one single stage. In this DC-DC Converter the winding losses and the switch conduction losses are reduced. The transformer eddy-current and proximity effects are analyzed. The MATLAB simulation results show that the output of converter is free from the ripples and regulate the output voltage. The experimental results are verified to validate the simulation results. The ability to boost and buck voltage makes the Z-Source inverter very attractive for electrolyser application.