An auxiliary hull unit detachably mounted to a transom on a marine vessel, wherein the hull unit is mounted at least partially below the water line of the vessel and arranged to extend rearwards parallel to the rearward extension of hull sections adjacent to the hull unit. The hull unit comprises a rear hydrofoil system for the marine vessel; the rear hydrofoil system comprising at least one pair of foldable hydrofoils which are pivotable in a lateral direction relative to the hull unit, wherein each hydrofoil is controllable by at least one actuator for displacement of the at least one pair of foldable hydrofoils in the lateral direction of the hull unit between a stowed position and a deployed position. The hull unit can be provided with a propulsion unit.

A small planing watercraft includes: a travel electrical component driven for travel of the small planing watercraft; an accessory electrical component provided separately from the travel electrical component; a battery supplying power to the travel electrical component and the accessory electrical component; a sensor detecting a physical quantity corresponding to a level of the battery; and processing circuitry determining, based on a result of detection of the sensor, whether the level of the battery is a predetermined power saving level, and controlling, when it is determined that the level of the battery is the power saving level, operation of the accessory electrical component so that power consumed by the accessory electrical component is less than that before determination.

A system and method of using accumulator(s) to generate electrical power in a marine environment. The system includes a first power source coupled to an electric machine coupled to a hydraulic pump coupled to an accumulator. The first power source is a power supply operable to convert AC to DC, and the accumulator is a high-capacity hydraulic energy storage device. The electric machine configured to operate as an electric motor driving the hydraulic pump in a first direction charges the accumulator. The charged accumulator configured to drive the hydraulic pump in a second direction driving the electric machine configured to operate as an electric generator to generate a second power source. The hydraulic/electric power system also includes a first controller configured to operate a first electrical load powered by the first power source and a second controller configured to operate a second electrical load powered by the second power source.

An auxiliary hull unit is detachably mounted to a transom on a marine vessel. The hull unit is mounted at least partially below the water line of the vessel and arranged to extend rearwards parallel to the rearward extension of hull sections adjacent to the hull unit. The hull unit has a rear hydrofoil system for the marine vessel. The rear hydrofoil system has at least one pair of foldable hydrofoils which are pivotable in a lateral direction relative to the hull unit. Each hydrofoil is controllable by at least one actuator for displacement of the at least one pair of foldable hydrofoils in the lateral direction of the hull unit between a stowed position and a deployed position. The hull unit can be provided with a propulsion unit.

A marine vessel (10) includes: a hull (11); an electric propulsion portion (15) that propels the hull (11); a water tank portion (20) that is provided on the hull (11) and is capable of storing water in the water tank portion; a float portion (40) that is provided within the water tank portion (20) so as to be movable upward and downward; and a battery case (30) that is attached to the float portion (40) and is capable of storing a detachable portable battery (35) which becomes an electric power source of the electric propulsion portion (15) in the battery case.

A marine busbar cabinet includes a low-voltage control system, a high-voltage busbar system, a cabinet body, and an insulating isolation structure. The high-voltage busbar system includes at least two battery clusters. The at least two battery clusters satisfy at least one of being connected in series or being connected in parallel. The low-voltage control system is electrically connected to the at least two battery clusters. The cabinet body has an accommodation cavity configured to accommodate the low-voltage control system and the high-voltage busbar system. The insulating isolation structure is disposed in the accommodation cavity. The insulating isolation structure is configured to divide the accommodation cavity into a low-voltage chamber and a high-voltage chamber that are insulated from each other. The low-voltage control system is disposed in the low-voltage chamber. The high-voltage busbar system is disposed in the high-voltage chamber.

The present invention is concerned with a buoyant rotatable marine transducer and a load reduction device defined by the buoyant rotatable marine transducer, and in particular a load reduction device for use in securing an offshore structure such as a floating platform or the like, as are common in the areas of marine renewables, oil and gas applications, aquaculture, the buoyant rotatable marine transducer having a buoyant body adapted to assume a first orientation when at least partially submerged in a body of water and unloaded, in which a longitudinal axis of the body is disposed substantially vertically, and first and second mooring connection points provided on the body wherein at least the first mooring connection point is positioned such that a load applied via the first mooring connection point to the body acts off axis of the longitudinal axis.