The global shift towards renewable energy sources (RES) to combat climate change and achieve sustainable energy goals is gaining momentum. Solar photovoltaic and wind-driven power stations are favored technologies for islanded power generation due to their efficiency and widespread availability. While battery storage systems have limitations for large-scale applications, hydrogen storage systems (HSS) are emerging as a valuable alternative, offering higher energy density and scalability. HSS, with its potential for long-term storage and green hydrogen generation, is seen as a superior choice for grid-level storage. Studies have explored optimal sizing and configuration planning for RES-HSS systems, emphasizing eco-technical parameters and reliability constraints. Integration of HSS with RES like solar and wind power stations shows promise for enhancing grid-scale electrification in remote areas. However, existing studies have primarily focused on optimal system planning using various optimization techniques without incorporating uncertainty modeling or conducting comprehensive sensitivity analyses. There is a lack of in-depth examination of the impact of individual system components, especially the influence of HSS tank size on system efficiency. Addressing these gaps is crucial to understanding the full potential of HSS in islanded power systems and optimizing their eco-technical performance.