A marine propulsion system for a marine vessel includes a marine propulsion device, a plurality of power storage devices, and a charge distribution circuit. The marine propulsion device includes an engine and an alternator driven by the engine to generate a charge current. The plurality of power storage devices includes at least a first power storage device and a second power storage device, wherein each power storage device is configured to receive current from the alternator. The charge distribution circuit is positioned between the alternator and the plurality of power storage devices and includes an isolator configured to isolate the first power storage device from the second power storage device, a charge sensor configured to sense a charge level of the first power storage device, and a relay configured to connect and disconnect the second power storage device to/from the alternator based on the sensed charge level.

The power source system includes high-voltage batteries; a first motor configured to receive power supplied from the high-voltage batteries. A first relay is arranged on a first power supply path. A second motor is configured to receive power supplied from the high-voltage batteries; the second relay that is arranged on a second power supply path. A detection unit detects an abnormality in the first power supply path and the second power supply path. A control unit controls the first relay and the second relay. The detection unit turns off the first relay when an abnormality is detected in the first power supply path, and turns off the second relay when an abnormality is detected in the second power supply path.

The power source system includes high-voltage batteries; a first motor configured to receive power supplied from the high-voltage batteries. A first relay is arranged on a first power supply path. A second motor is configured to receive power supplied from the high-voltage batteries; the second relay that is arranged on a second power supply path. A detection unit detects an abnormality in the first power supply path and the second power supply path. A control unit controls the first relay and the second relay. The detection unit turns off the first relay when an abnormality is detected in the first power supply path, and turns off the second relay when an abnormality is detected in the second power supply path.

A coverage robot including a chassis, multiple drive wheel assemblies disposed on the chassis, and a cleaning assembly carried by the chassis. Each drive wheel assembly including a drive wheel assembly housing, a wheel rotatably coupled to the housing, and a wheel drive motor carried by the drive wheel assembly housing and operable to drive the wheel. The cleaning assembly including a cleaning assembly housing, a cleaning head rotatably coupled to the cleaning assembly housing, and a cleaning drive motor carried by cleaning assembly housing and operable to drive the cleaning head. The wheel assemblies and the cleaning assembly are each separately and independently removable from respective receptacles of the chassis as complete units.

A coverage robot including a chassis, multiple drive wheel assemblies disposed on the chassis, and a cleaning assembly carried by the chassis. Each drive wheel assembly including a drive wheel assembly housing, a wheel rotatably coupled to the housing, and a wheel drive motor carried by the drive wheel assembly housing and operable to drive the wheel. The cleaning assembly including a cleaning assembly housing, a cleaning head rotatably coupled to the cleaning assembly housing, and a cleaning drive motor carried by cleaning assembly housing and operable to drive the cleaning head. The wheel assemblies and the cleaning assembly are each separately and independently removable from respective receptacles of the chassis as complete units.

A foldable electric scooter and a manufacture method of the same. The foldable electric scooter includes a main body assembly, a front fork assembly located at the front end of the main body assembly, a rear fork assembly located at the rear end of the main body assembly, a telescoping plate assembly located on top of the front fork assembly and a handlebar assembly located on top of the telescoping plate assembly. The foldable electric scooter has a double headset design that increases a rake angle for more steering stability while still keeping the steering upright for an upright holding of the handlebars. The foldable electric scooter is manufactured by stamping of flat plate material.

A drive system for a vehicle having a rear drive assembly powered by a first power source, a front drive assembly in selective electrical communication with a second power source, a selector switch to selectively permit or prevent electrical communication between the front drive assembly and the second power source, and an output capacity sensor to detect an output of the first power source, where the rear drive assembly drives the vehicle when the selector switch is in a first position and both the rear and front drive assemblies drive the vehicle when the selector switch is in a second position and the output capacity sensor detects that the output of the first power source meets a threshold output.

A drive system for a vehicle having a rear drive assembly powered by a first power source, a front drive assembly in selective electrical communication with a second power source, a selector switch to selectively permit or prevent electrical communication between the front drive assembly and the second power source, and an output capacity sensor to detect an output of the first power source, where the rear drive assembly drives the vehicle when the selector switch is in a first position and both the rear and front drive assemblies drive the vehicle when the selector switch is in a second position and the output capacity sensor detects that the output of the first power source meets a threshold output.

A flying mobile body 4 includes: a rotary blade to rotate to generate lift; an airframe in which the rotary blade is provided; a power reception antenna to include a power reception surface that receives a radio wave transmitting electric power, the power reception surface having an area larger than an area projecting the airframe onto a rotation axis perpendicular plane that is a plane perpendicular to a rotation axis direction that is a direction parallel to a rotation axis of the rotary blade, and a drag reducing structure that reduces a drag generated with respect to a descending airflow generated by rotation of the rotary blade: a converter to convert electric power of the radio wave received by the power reception antenna into DC electric power; a storage battery; and an electric motor to generate power rotating the rotary blade.

A flying mobile body 4 includes: a rotary blade to rotate to generate lift; an airframe in which the rotary blade is provided; a power reception antenna to include a power reception surface that receives a radio wave transmitting electric power, the power reception surface having an area larger than an area projecting the airframe onto a rotation axis perpendicular plane that is a plane perpendicular to a rotation axis direction that is a direction parallel to a rotation axis of the rotary blade, and a drag reducing structure that reduces a drag generated with respect to a descending airflow generated by rotation of the rotary blade: a converter to convert electric power of the radio wave received by the power reception antenna into DC electric power; a storage battery; and an electric motor to generate power rotating the rotary blade.