The objective of the paper is to analyze theoretically technological solutions of power supply for modular passive building based on the PV energy generation and looking the optimal storage. It is planned to develop a model of power supply system for mobile modular commercial building up to 20m2 with smart system elements using solar, power with no connections to external engineering and verify the micro grid stability. Design of power supply system's model will be developed and load analysis will be carried out for the modular building. Following tasks will be decided in the paper: development of model of power supply system for modular building for the mobile and stationary consumers, analysis of optimal location and technical parameters of PV energy sources, development of model of power supply system for technologically highly efficient mobile building.