As of 1 April 2026, the PSJD database will become an archive and will no longer accept new data. Current publications from Polish scientific journals are available through the Library of Science: https://bibliotekanauki.pl
his paper presents selected aspects of an alternative power supply for small HVAC systems. The application of a system based on photovoltaic cells together with energy accumulation in VRLA gel batteries was analysed. The results were obtained using laboratory installation and were compared with the predicted data.