Vessel power supply system
A vessel power supply system for a vessel including a propulsion device that includes an engine and a generator driven by the engine to generate electricity, includes a first battery that supplies power to the propulsion device, a second battery that supplies power to accessories of the vessel, a first open circuit voltage sensor that detects an open circuit voltage of the first battery, a second open circuit voltage sensor that detects an open circuit voltage of the second battery, and a switch that is turned on/off to open and close a current path between the first battery and the second battery.
1. A vessel power supply system for a vessel including a propulsion device that includes an engine and a generator driven by the engine to generate electricity, the system comprising:
a first battery that supplies power to the propulsion device;
a second battery that supplies power to accessories of the vessel;
a first open circuit voltage sensor that detects an open circuit voltage of the first battery;
a second open circuit voltage sensor that detects an open circuit voltage of the second battery;
a first switch that is turned on/off to open and close a current path between the first battery and the second battery;
a first storage that stores a first open circuit voltage value detected by the first open circuit voltage sensor when the first switch is in an off state;
a second storage that stores a second open circuit voltage value detected by the second open circuit voltage sensor when the first switch is in an off state;
a first battery remaining level calculator that calculates a first battery remaining level of the first battery according to the first open circuit voltage value stored in the first storage and an integrated value of a current flowing into/out of the first battery; and
a second battery remaining level calculator that calculates a second battery remaining level of the second battery according to the second open circuit voltage value stored in the second storage and an integrated value of a current flowing into/out of the second battery.
2. The vessel power supply system according to claim 1 , wherein
the second battery is connected via the current path to the propulsion device; and
the first switch is turned on/off to connect/disconnect the second battery and the propulsion device.
3. The vessel power supply system according to claim 1 , further comprising a switch controller configured or programmed to control the first switch.
4. The vessel power supply system according to claim 3 , further comprising a main switch that is turned on by a user to power the propulsion device and to be turned off by the user to stop power to the propulsion device; wherein
the switch controller turns the first switch off when the main switch is turned off.
5. The vessel power supply system according to claim 4 , further comprising a start determining processor configured or programmed to determine whether the engine of the propulsion device has started; wherein
the switch controller turns the first switch on when the main switch is turned on and the start determining processor determines that the engine has started.
6. The vessel power supply system according to claim 5 , wherein the start determining processor determines whether the engine has started using a rotational speed of the engine or a circuit voltage within the propulsion device.
7. The vessel power supply system according to claim 1 , further comprising a charging circuit that charges the first battery and the second battery with electric power generated by the generator; wherein
when the first switch is on and once the first battery remaining level calculated by the first battery remaining level calculator becomes lower than a first threshold value, the first switch is turned off.
8. The vessel power supply system according to claim 7 , wherein, when the first switch is off and once the first battery remaining level calculated by the first battery remaining level calculator exceeds a second threshold value that is equal to or higher than the first threshold value, the first switch is turned on.
9. The vessel power supply system according to claim 7 , further comprising a charge limiter that limits the charging operation by the charging circuit when the first battery remaining level calculated by the first battery remaining level calculator is equal to or higher than a third threshold value that is equal to or higher than the first threshold value and the second battery remaining level calculated by the second battery remaining level calculator is equal to or higher than a fourth threshold value.
10. The vessel power supply system according to claim 1 , further comprising a second switch that is turned on/off to connect/disconnect the first battery and the propulsion device.
11. A vessel power supply system for a vessel including a propulsion device that includes an engine and a generator driven by the engine to generate electricity, the system comprising:
a first battery that supplies power to the propulsion device;
a second battery that supplies power to accessories of the vessel;
a first open circuit voltage sensor that detects an open circuit voltage of the first battery;
a second open circuit voltage sensor that detects an open circuit voltage of the second battery;
a first switch that is turned on/off to open and close a current path between the first battery and the second battery;
a first storage that stores a first open circuit voltage value detected by the first open circuit voltage sensor when the first switch is in an off state;
a second storage that stores a second open circuit voltage value detected by the second open circuit voltage sensor when the first switch is in an off state;
a first battery remaining level calculator that calculates a first battery remaining level of the first battery according to the first open circuit voltage value stored in the first storage and an integrated value of a current flowing into/out of the first battery;
a second battery remaining level calculator that calculates a second battery remaining level of the second battery according to the second open circuit voltage value stored in the second storage and an integrated value of a current flowing into/out of the second battery;
a charging circuit that charges the first battery and the second battery with electric power generated by the generator; and
a second switch that is turned on/off to connect/disconnect the first battery and the propulsion device; wherein
when the first switch is on and once the first battery remaining level calculated by the first battery remaining level calculator becomes lower than a first threshold value, the first switch is turned off; and
once the first battery remaining level calculated by the first battery remaining level calculator exceeds a second threshold value that is equal to or higher than the first threshold value, the first switch is turned on and the second switch is turned off.
12. The vessel power supply system according to claim 11 , further comprising a charge limiter that limits the charging operation by the charging circuit when the first battery remaining level calculated by the first battery remaining level calculator is equal to or higher than a third threshold value that is equal to or higher than the first threshold value and the second battery remaining level calculated by the second battery remaining level calculator is equal to or higher than a fourth threshold value.