Ballesteros Álvarez, José ManuelVillena Escribano, Blasa MaríaRodríguez Sáiz, ÁngelGonzález Gaya, CristinaRomero Barriuso, Álvaro2025-07-022025-07-022024-11-26Ballesteros Álvarez, J.M., Romero Barriuso, Á., Villena Escribano, B.M., Rodríguez Sáiz, Á., González Gaya, C. (2024). Safety Conditions in Battery Rooms for Renewable Energy Systems: Dimensioning, Ventilation, and Classification of ATEX Areas. In: Torres González, M., Rubio Bellido, C. (eds) Towards Low and Positive Energy Buildings. Green Energy and Technology. Springer, Cham. https://doi.org/10.1007/978-3-031-70851-0_4978-3-031-70850-3, Online ISBN 978-3-031-70851-0https://doi.org/10.1007/978-3-031-70851-0_4https://hdl.handle.net/20.500.14468/26969This chapter analyzes the safety conditions in battery rooms for renewable energy installations, focusing on sizing, ventilation, and classification according to the ATEX directive. For this purpose, the applicable European regulations are used as a reference to determine the classified areas according to fire and explosion risks, as well as the required safety distance and ventilation. An example application for a 24-V lead-acid battery is presented. The chapter also discusses safety measures for battery rooms that produce hydrogen and oxygen during the charging process, with reference to the technical reference specifications for determining the required hazard distance and ventilation openings. Graphical results are provided for the different battery types and voltages analyzed. Finally, it is concluded that the measures established by the new European application standard need to be adapted to comply with current legislation.eninfo:eu-repo/semantics/closedAccess33 Ciencias Tecnológicasbook part