Patent ID: 8159186

Claim:
A power source system comprising: a power source device that supplies power to a load device; a power storage device that supplies, in place of the power source device, power to the load device when the power source device stops; and a control unit that controls power supply from the power storage device to the load device, wherein the control unit has: a stop determination unit that determines whether the power supply device has stopped; and a state quantity setting unit that sets a first target state quantity indicating a state of charge of the power storage device that is to be a target value when charge and discharge of the power storage device are controlled, in order to maintain the state of charge of the power storage device within a predetermined range, and the state quantity setting unit changes the first target state quantity to a second target state quantity that is to be a target value exceeding the first target state quantity in a case where the stop determination unit determines that the power source device has stopped.