The article traces the historical evolution of photovoltaic hydrogen production systems from the 1970s to the early 2000s. Researchers like Cox, Costogue, Esteve, and Bockris were pioneers in studying the performance and design aspects of solar photovoltaic electrolysis systems to produce hydrogen from water. Studies focused on improving efficiency, optimizing the solar energy conversion process, and assessing the feasibility of electrolytic hydrogen production. Significant advancements included the development of one-unit photovoltaic electrolysis systems based on amorphous silicon cells, which offered improved performance. Research in the 1990s explored innovative methods such as high-temperature steam electrolysis and artificial photosynthesis to enhance hydrogen production. Overall, the article highlights the progress made in utilizing solar energy for sustainable hydrogen generation and underscores the importance of continued research in this field.