POWER SUPPLY REDUNDANCY SYSTEM

A power supply redundancy system includes a main battery that supplies power to a first load unit and a second load unit, a sub-storage that supplies power to at least the second load unit, a switching unit that switches a power supply path from the main battery and the sub-storage to the first load unit and the second load unit, a control board on which a switching control unit is mounted, the switching control unit for switching and controlling the switching unit, and a housing that accommodates at least the main battery, the sub-storage, and the switching unit. The control board is operable by receiving power supply from both the main battery and the sub-storage.