The Picea modular green system is designed for scalability, allowing seamless integration into diverse settings. Its plug-and-play architecture enables: - Residential applications: Single units power detached homes with solar-hydrogen storage. - Multi-building complexes: Cascaded Picea units (e.g., 9 units in Bad Kissingen) supply energy to multi-family buildings with 13,500 kWh storage capacity. - Commercial/industrial use: Larger configurations support offices, hotels, or small factories. Each module includes an electrolyzer, fuel cell, battery, and hydrogen storage, ensuring redundancy and adaptability. The system’s modularity also simplifies maintenance and future upgrades, making it a future-proof solution for evolving energy needs.