Patent ID: 8487457

Claim:
An engine system comprising: a starter motor that starts an engine; a transformer in which a driving voltage to the starter motor is an output of a secondary and a branch terminal is provided along a path of a primary; a power receiving device that receives a voltage supplied from an alternating-current power supply; and a switcher that connects a switching terminal that is connected to one power receiving terminal of the power receiving device to either a first terminal that is connected to one of two terminals in the path of the primary or a second terminal that is connected to the branch terminal of the transformer, wherein the other power receiving terminal of the power receiving device and the other of the terminals in the path of the primary are connected, the terminals in the path of the primary and the alternating-current power supply are electrically connected, and an open/close relay is provided in at least one of connecting paths between the terminals in the path of the primary and the alternating-current power supply, the one power receiving terminal of the power receiving device and the second terminal of the switcher are connected if the open/close relay is closed, and the one power receiving terminal of the power receiving device and the first terminal of the switcher are connected if the open/close relay is open.