Methods, systems, and devices for managing a power system are described. A power management system may include multiple interconnected power supply and control units that plug directly into a standard residential power outlet. A power management system may include multiple interconnected power supply and control units that plug directly into a standard residential power outlet. Together, the interconnected power supply and control units may provide a distributed power backup system in the form of a home energy nano-grid. The power management system may provide backup power, power sharing, and device inter-connectivity while enabling efficient scalability and the robustness of a distributed system. The power management system may also include a power usage monitoring unit, which may gather data and use it to improve the efficiency of power usage throughout the home.