Battery storage systems for buildings are a modern solution for storing and managing electrical energy efficiently. They allow electricity generated from solar panels or other sources to be stored and used when needed. Battery systems are used in private houses, apartment buildings, offices, and industrial facilities. These solutions help reduce electricity costs and dependence on the grid during peak hours. Batteries also provide backup power in case of grid outages. Systems can be integrated with solar panels and building management systems (BMS). Design considers required capacity, storage volume, and operating profile. Battery storage improves overall energy efficiency and sustainability of buildings. Such systems play an important role in modern energy-independent buildings.