This study presents the experimental setup and performance analysis of a hybrid photovoltaic–battery–electrolyzer system designed for “green” hydrogen production using surplus solar power. The setup integrates PV arrays, lithium storage, power electronics, and an alkaline electrolyzer operating dynamically under real solar conditions. Results show stable hydrogen output up to 511 L h⁻¹ at 2.5 kW and a linear correlation between electrolyzer power and hydrogen flow. The system achieved high efficiency and reliable operation under variable irradiance, confirming the technical feasibility of renewable-powered electrolysis and its potential for future Power-to-Gas (P2G) applications.