Electrical power supply system, moving object, control method, and storage medium

An electrical power supply system, comprising:

• a first electrical power supply circuit configured to be connected to a first load device;
• a second electrical power supply circuit configured to be connected to a second load device;
• a first electrical power storage device configured to be connected via a first disconnection device to the first electrical power supply circuit;
• a second electrical power storage device configured to be connected via a second disconnection device to the second electrical power supply circuit;
• a first connection circuit including a first connection device configured to connect the first electrical power supply circuit and the second electrical power supply circuit;
• and
• one or more processors that execute a computer-executable instructions stored in a memory,
• wherein the one or more processors execute the computer-executable instructions to cause the electrical power supply system to:
• estimate a first residual capacity, which is a residual capacity of the first electrical power storage device, based on an amount of electrical power that is charged and discharged by the first electrical power storage device;
• and
• in a state in which, by controlling the first connection device, the second electrical power storage device is connected via the first connection circuit and the second electrical power supply circuit to the first electrical power supply circuit, disconnect the first electrical power storage device from the first electrical power supply circuit by controlling the first disconnection device, and update a first residual capacity estimated value, which is the first residual capacity that has been estimated, based on an open circuit voltage of the first electrical power storage device.