This study aims to extend the previous research on PV generation systems. The author previously proposed the new PV generation system where surplus electric power is used for electrolysis of water to generate hydrogen, converting into electricity by Fuel Cell (FC) at nighttime or in bad weather. In the current system, oxygen is produced as a by-product of the process. Therefore, this paper investigates the use of this oxygen for power generation, which makes the system more effective than the old system of FC with the air. The latest FC technology, Polymer Electrolyte Fuel Cell (PEMFC), is used to conduct the whole experiment to get the best result. Using air and oxygen shows that when oxygen is used, FC efficiency increases by 12%, and the output power is increased twice as much as air. This research has added into the domain of FC and its usage. Valuable recommendations are given based on the analysis and results.

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