Abstract: A marine vessel propulsion device includes a propeller rotatable around a propeller axis, a duct that surrounds the propeller around the propeller axis, an internal combustion engine that rotates the propeller relative the duct, and an electric motor that rotates the propeller relative to the duct. The propeller includes a plurality of blades, and a cylindrical rim that surrounds the plurality of blades around the propeller axis. The electric motor rotates the propeller by rotating the rim.

Abstract: A marine vessel propulsion device includes a bracket that is attachable to a marine vessel, a duct that is rotatable around a steering axis with respect to the bracket, a propeller that is rotatable with respect to the duct around a propeller axis extending in a direction perpendicular or substantially perpendicular to the steering axis, and an electric motor that rotates the propeller. The propeller includes a plurality of blades and a cylindrical rim that surrounds the plurality of blades, and is surrounded by the duct. The electric motor rotates the rim with respect to the duct.

Abstract: An electric outboard motor to be driven by an electric motor separately includes an electric outboard motor main body including the electric motor and a propulsion section that applies the electric motor as motive power and a power supply section supplying power to the electric motor, in which the electric outboard motor main body and the power supply section are detachably connected by couplers via a cable. Further, the coupler of the cable is allowed to be attached and detached to and from the coupler on a side of the power supply section.

Abstract: The disclosure concerns a self-propelled ship comprising a shipboard electric network, a main electrical supply bus, propulsion means, a motor for driving the propulsion means, and means for supplying electricity to them. According to the disclosure, the supply means comprise a set of electric capacitors having a capacitance sized to provide, at their nominal electrical charge, at least temporarily, both of the nominal supply of the shipboard network and of the electric motor through the bus, and electrical connection means arranged on board the ship for connecting the set of electric capacitors to another electric network located at an arrival and/or departure point of the ship, for the purpose of recharging the capacitors to their nominal charge and to supply the first network during a stop at the arrival and/or departure point.

Abstract: A vehicle is provided that is amphibious to include submersible operations. The vehicle has wings configured to generate a sufficient dive force to oppose buoyancy of the vehicle, when desired, which are disposed on opposing sides of a central hull. The vehicle is configured to enable easy transition from land operations to water operations, to include water surface travel as well as submerged travel.

Abstract: A personal watercraft body comprises a recess configured to receive similarly shaped cassettes. A first cassette may be motorized to propel the body relative to a body of water. A second cassette may be non-motorized and may include a storage space therein for storing personal items. An insert may be disposed between the cassettes and the recess to orient and fit the cassettes within the body.

Abstract: A small size floating vessel having a dual fuel system, optimized cargo capacity, and options for selectively operating on diesel fuel and natural gas for maximizing the range of vessel operation and reducing vessel emissions of nitrogen oxides and particulates.

Abstract: The improvements of the present invention provide multipurpose and multi-functional improvements that enhance the functional utility of water vehicles. The combination includes connecting means which allow adaptation of a platforms, storage, and seating. An improved motor mount permits a motor to be protectively stowed until a hinge is actuated to rotate the motor 180 degrees for operation. The improvements also provide motor controls, an anchor and motor controls attached to a seat platform. A shelter hood assembly attaches in a selectable, collapsible manner giving an operator use and appearance configuration options, allowing the assembled hood to act as a barrier against weather elements in addition to supplying functional color components including wildlife decoys, camouflage, safety markings, diving insignia, or other aesthetic designs or coloring.

Abstract: An inflatable watercraft comprises a motorized cassette and at least one inflatable chamber. The at least one inflatable chamber is foldable relative to the motorized cassette at least when the inflatable watercraft is in a deflated configuration. The motorized cassette includes a motor, an impeller, at least one battery, and a pump configured to inflate the at least one inflatable chamber. The pump can include a reversible pump configured to deflate the at least one inflatable chamber.

Abstract: There is provided an item which floats in a body of water. The item includes a body having a surface provided to form at least part of the underside of the item and an opposing surface. The item includes apparatus comprising at least one channel which passes between the surfaces and allows the passage of water therethrough. A means provided to influence and/or be influenced by the passage of the water through the at least one channel to exert a propelling and/or controlling force on the item.

Abstract: This disclosure provides improved nautical craft that can travel and navigate on their own. A hybrid vessel is described that converts wave motion to locomotive thrust by mechanical means, and also converts wave motion to electrical power for storage in a battery. The electrical power can then be tapped to provide locomotive power during periods where wave motion is inadequate and during deployment. The electrical power can also be tapped to even out the undulating thrust that is created when locomotion of the vessel is powered by wave motion alone.

Abstract: Provided is an electric outboard motor that includes a drive motor, which is an AC motor, as a drive source. The electric outboard motor includes: an outboard motor main body that includes the drive motor and an inverter that converters a direct current to an alternating current to supply the alternating current to the drive motor; a control/power supply unit that is formed separately from the outboard motor main body and that can supply the direct current to the inverter; and a connection cable that electrically connects the outboard motor main body and the control/power supply unit. The inverter and the drive motor are stacked and arranged in an axial direction of a rotation output axis of the drive motor. Part of the inverter falls within an outline of the drive motor in a view in the axial direction of the rotation output axis of the drive motor.

Abstract: A multi-functional modular device includes: a shaft; electric motor(s); propeller(s); battery(s); and paddle blade(s) being removably attachable to the shaft for levering of a boat. With the blade(s) attached to the shaft and motor(s) de-energized, the device is usable for manual levering, and with the motor(s) energized, propeller thrust selectively assists in levering to propel the boat. Propeller thrust in a direction opposite to a propulsive direction from levering reduces work required per stroke, reducing the total levering power per stroke. Alternatively, using the thrust in the same direction as propulsive levering increases total propulsive power per stroke, but requires greater strength/work output by the rower/paddler. Removing the blade permits the propeller and motor to be statically submerged and clocked for directional propulsion.

Abstract: A power supply system for a marine drilling vessel is provided. The power supply system comprises a first power grid section coupled to a generator configured to generate electric power and further coupled to an electrically powered active heave compensator. The heave compensator is configured to raise and lower a drill string relative to the marine drilling vessel. The power supply system further comprises a second power grid section coupled to a generator configured to generate electric power and further coupled to an electrically powered thruster drive of the marine drilling vessel. The first power grid section is electrically coupled to the second power grid section.

Abstract: A propulsion chain (8) for a ship (6) including a main heat engine (18); at least one secondary electrical power house (26) powering a distribution panel (34); at least one transmission line (16) provided with an end propeller (14) and mechanically coupled to the main heat engine (18) to drive the latter; at least one rotating electrical machine (22) mechanically coupled to the transmission line (16) and powered from the distribution panel (34), a mechanical coupler (20) able to be freed from the main heat engine (18) and the rotating electrical machine (22) arranged on the transmission line (16), between the rotating electrical machine (22) and the main heat engine (18).

Abstract: The object of the invention is an electric current-generating and/or electric power-plant device (50) in a sailing structure comprising at least one power plant and at least one battery pool, whereby said power plant comprises at least one heat engine (18), a reducer/inverter assembly, and particularly a shaft line (22) equipped with at least one propeller at its end, with the current-generating device (50) being inserted between the flange (66) of the engine cover (68) of said engine (18) and the flange (70) of the reducer/inverter assembly (20), where said device (50) is characterized in that it takes the form of a closed module (64) that can be inserted directly between the flange (66) of the engine cover (68) and the flange (70) of the reducer/inverter assembly without disassembly, total or partial, of its components.

Abstract: A system for mounting a motorized cassette to a watercraft body comprises a mounting assembly configured to releasably secure the system to the watercraft body, a housing, a tiller, and a motorized cassette. The housing includes a receiving space and the motorized cassette is configured to be at least partially inserted into the receiving space. Manipulation of the tiller causes rotation of the housing relative to the mounting assembly such that the tiller can be used to steer the watercraft body.

Abstract: Improvements to electrically powered watercraft including kayaks are disclosed. The watercraft comprises a hull defining a cavity and a battery powered retractable propulsion unit. The retractable propulsion unit can be retracted into the cavity with powered or unpowered means. Various retractable propulsion units are disclosed, including propulsion units that are steerable wherein the thrust can be selectively directed. Specific embodiments to improve the steerability of electrically powered watercraft are disclosed. Mechanisms for disengaging the steering controls from the retractable propulsion units are also disclosed. Locking mechanisms for locking the retractable propulsion unit in an extended or fully retracted position are also disclosed.

Abstract: An outboard drive for a boat, having an electric motor, a power supply line and a contact-making apparatus, connected to the power supply line for connecting a DC voltage source. The outboard drive has a space for accommodating the DC voltage source. The contact-making apparatus has a first and a second contact stage, and a current limitation element is connected between the DC voltage source and the power supply line in the first contact stage.

Abstract: A power unit is housed in a casing, and a screw (propeller) is disposed outside the casing, the screw being driven by the power unit. The casing is formed as a watertight case in a substantially rectangular parallelepiped shape with a left-right width direction being a longitudinal direction, and the case has at least a front face portion coupled to a stern portion and a substantially flat upper face portion at a substantially same height as a top portion of the stern portion.

Abstract: A submersible vehicle for use in water includes a vehicle body and a hybrid vehicle propulsion system to propel the vehicle body through the water. The hybrid vehicle propulsion system includes a passive thrust system and an active thrust system. The passive thrust system includes a force redirector and a buoyancy control system. The buoyancy control system is operable to selectively generate vertical thrust by varying a buoyancy of the submersible vehicle and the force redirector is configured to generate a glide thrust responsive to changes in the elevation of the submersible vehicle in the water. The active thrust system includes a thruster mechanism operable to selectively propel and/or steer the vehicle body through the water.

Abstract: A device for charging at least one electric battery (1) on board a boat comprises a propeller (2) adapted to immersed in water through the movement of the boat be driven to rotate a axle (3) and an electric direct current machine (8) connected to the axle and adapted to generate voltage to the battery for charging thereof upon rotation of the axle. A DC/DC-converter (7) is arranged to convert the voltage generated by the electric machine through the rotation of the axle to a higher voltage suited for charging the battery. A member (10) is adapted to measure the voltage generated by the electric machine and a micro processor unit (9) is adapted to control the DC/DC-converter on the basis of voltage data delivered by said member.

Abstract: A ship drive system includes a first and one second drive shaft for driving a respective propulsion unit, wherein each of the electric drive shafts includes at least one speed-variable generator driven by an internal combustion engine for generating a motor voltage having a variable amplitude and variable frequency, and at least one speed-variable drive motor that is supplied with the voltage and coupled to the propulsion unit. The first and second drive shafts can be switched from a first operating state, in which they are electrically disconnected from each other, to a second operating state, in which they are electrically coupled to each other such energy can be transmitted from the at least one generator of the one drive shaft to the at least one drive motor of the other drive shaft. To this end, the at least one generator includes a superconductor winding.

Abstract: The invention relates to a method for improving the propulsion efficiency of vessels. The improvement is obtained by utilizing wave induced variations in propeller inflow, i.e. the speed of water flowing towards the propeller. The wave induced water speed variation is used to calculate the propeller speed in a way so that the propeller speed is optimal with respect to the total propulsion efficiency. The optimal propeller speed is determined by solving an optimization problem formulated as the maximization of the ratio of energy delivered by the propeller and the energy delivered to the propeller. The method may be used for vessels with one or more propellers.

Abstract: An electric outboard drive adapted to be mounted on a transom of a boat through a mounting bracket includes a driving device and a propelling device. Through engagement of a first transmission shaft with a second transmission shaft, the power of an electric motor of the driving device is transmitted to a propeller of the propelling device. As a result, when the electric motor drives the first transmission shaft to rotate, the propeller is rotated by the transmission of the second transmission shaft to propel the boat.

Abstract: Cooling systems and methods for hybrid marine propulsion systems are disclosed. A first cooling circuit is arranged to convey raw cooling water through an internal combustion engine and to at least one drive component of a drive unit for the marine propulsion system. A second control circuit is arranged to convey raw cooling water through an electric motor. The system is arranged such that raw cooling water in the second cooling circuit is conveyed to the first cooling circuit to cool the drive component without cooling the component of the internal combustion engine.

Abstract: There is provided a hybrid outboard motor capable of transmitting motive power of a power source appropriately and efficiently in a limited space while achieving compactness, high performance, and the like. The hybrid outboard motor includes: a casing; a power unit housed in the casing; a screw disposed outside the casing, the screw being driven by the power unit; a power transmission system transmitting motive power of the power unit to the screw; an internal combustion engine and an electric motor serving also as a generator, the internal combustion engine and the electric motor being arranged in parallel in a beam direction in the casing; and a first clutch disposed between the internal combustion engine and the electric motor, wherein one or both of the internal combustion engine and the electric motor are connected to a propulsion unit including the screw so as to rotate it.

Abstract: The invention relates to a drive device (1) for water vehicles comprising a propeller (2), a drive mechanism (3) for driving the propeller (2), and a magnetic coupling (4) which is arranged between the propeller (2) and the drive mechanism (3), wherein the magnetic coupling (4) comprises an outer magnetic element (7), an inner magnetic element (9) and a can (11), and wherein the can (11) is arranged between the inner magnetic element (9) and the outer magnetic element (7).

Abstract: There is provided a ship, in particular a cargo ship. It has a plurality of Magnus rotors, wherein associated with each of the plurality of Magnus rotors is an individually actuable electric motor (M) for rotating the Magnus rotor, wherein associated with each electric motor (M) is a converter (U) for controlling the rotary speed and/or the rotary direction of the electric motor (M).

Abstract: A personal watercraft body comprises a recess configured to receive similarly shaped cassettes. A first cassette may be motorized to propel the body relative to a body of water. A second cassette may be non-motorized and may include a storage space therein for storing personal items. An insert may be disposed between the cassettes and the recess to orient and fit the cassettes within the body.

Abstract: A water vehicle moving on or in a liquid and including a flotation element (1) that is connected by a connection member (6) to a carrier (3), the water vehicle being characterized in that the connection member (6) is shaped so as to enable the carrier (3) to assume at least two positions, namely:—a raised position where the longitudinal axis of the carrier (3) and those of the flotation element (1) substantially extend into the same horizontal plane, the carrier (3) then being on the surface and capable of making up a central shell; and—a lowered position where the carrier (3) extends under the plane including the longitudinal axis of each of the flotation element (1), the carrier (3) then being submerged.

Abstract: An autonomous aquatic vehicle with one or more fuel cells, a controller, a plurality of sensors, a battery, and at least one electric motor and propeller. The one or more fuel cells provide power to the battery, and the battery provides power for the vehicle. Seawater is provided to anodes of the fuel cell and air or oxygen is provided to the cathode to produce power for supply to the battery. The seawater-anode reaction creates waste or byproduct that tends to decrease output of the fuel cell. The waste or byproduct is automatically flushed from the fuel cell using seawater.

Abstract: The invention relates to a motorized watercraft with a control device (1) and with a drive unit (30) having a water propeller that is driven by an electric motor (31). The electric motor (31), an operating unit (10), a motor controller (20), a battery controller (50) and a battery (60) are placed in a vehicle hull, and the water propeller is mounted in a flow channel in the vehicle hull. In order to connect the controlling components and the components to be controlled by means of a system architecture, a system bus and of a man-machine interface, the invention provides that the operating unit (10), the motor controller (20), and the battery controller (50) are data-connected by means of a communications device controlled by the control device (1). This enables an, in particular, fail-safe transmission of data, a constant monitoring of the system components, and when required, an emergency shut-down.

Abstract: A marine power system comprises a motor for providing propulsion. It also comprises an energy storage unit (ESU) for storing and supplying energy to the motor. A prime power system is connected to the ESU and motor for selectively providing energy to these subsystems through a bus. The motor selectively receives energy from the prime power system and the ESU and can supply regenerative braking energy to the bus. The system can also accommodate multiple generator sets providing system power. The ESU can also provide starting power for the prime power system. Alternately, the prime power system drives a mechanical power system output shaft connected to the motor, and the marine system comprises an alternator driven by the prime power system output shaft. The ESU can transmit energy to the alternator. The prime power system can be located on a tugboat displacing a barge carrying the energy storage unit.

Abstract: The disclosed invention is directed to a watercraft which comprises at least one main force member attached to at least one wing; the main force member and/or wing and/or a float attached to the wing comprise sufficient displacement to provide flotation for the craft and its payload. Connected to the main force member is a force transmitting member, to which the engine is connected. The engine may comprise a person or another engine (conventional, electronic, wind, etc.). The engine may comprise a weight which undergoes vertical translation, thereby producing the force transmitted by the force transmitting member to the main force member.

Abstract: A mixed propulsion system for a seagoing vessel such as a liquid natural gas carrier including a gas turbine engine is described. The vessel has at least one electric propulsion drive and a plurality of prime movers of different types each coupled directly to drive an electrical generator. The outputs of the several generators are connected to at least two electricity distribution switchboards to supply the power requirements of the vessel, and each electric propulsion drive is cross-coupled to receive power selectively from either switchboard such that in the event of a single failure in a switchboard or prime mover or both power can be maintained to both propulsion drives.

Abstract: An enhanced counter-rotating electric motor and an associate propulsion system for use with a water-vehicle includes a motor housing, a stator within the housing that rotates about a central axis in one direction, an armature within the stator that rotates about the central axis in an opposite direction from the stator, a first axle that is secured to the stator and extends out from the housing, a second axle that is secured to the armature and extends out from the housing, water-tight rotational seals about each of the two axles, a centrifugal-force-balancing electrical connection mechanism that supplies functioning electrical communication between the motor and external electrical circuitry while operating the motor, and a propeller secured to each said axle.

Abstract: A method for operating a vessel is provided. The method can include determining the most efficient power source from a plurality of power sources for operating the vessel. The power sources can include a battery bank and an AC power source. The method can also include drawing power from the most efficient power source to operate the vessel; harvesting energy from electrical rotating sources; monitoring the battery bank; and charging the battery bank when a state of charge of the battery bank drops below a predetermined state of charge, wherein the charging is performed using the harvested energy, the AC power source, an external power source, or a combination thereof.

Abstract: There is provided a ship, in particular a cargo ship. It has a plurality of Magnus rotors, wherein associated with each of the plurality of Magnus rotors is an individually actuable electric motor (M) for rotating the Magnus rotor, wherein associated with each electric motor (M) is a converter (U) for controlling the rotary speed and/or the rotary direction of the electric motor (M).

Abstract: A gas-fired superconductive electrically propelled ship is provided with a cargo tank 1 (fuel tank) for storage of LNG 2, a vaporized gas feed line 3 for feeding of vaporized gas 2? produced in the cargo tank 1 as fuel to dual-fuel engines (driving engines) 5 for generators 6, a gas heater 4 incorporated in the vaporized gas feed line 3 for heating of the vaporized gas 2?, a propelling superconductive motor 7 driven with electric power produced by the generator 6, a heat pump 15 for cooling the superconductive motor 7 and maintaining low temperature of the motor and an LNG gasification line 26 for feeding of LNG 2 from the cargo tank 1 as cold source for compression radiation treatment in the heat pump 15 and for guiding of the vaporized gas 2? having treated to the cargo tank 1 and to the vaporized gas feed line 3 at entry-side of the gas heater 4.

Abstract: Provided is an apparatus for generating electricity required by an LNG carrier which stores LNG, which is obtained by liquefying natural gas to ultra low temperature in a gas field, in an LNG storage tank and carries the stored LNG. The apparatus includes: a reformer reforming boil-off gas occurring in the LNG storage tank and producing synthetic gas; and a fuel cell generating electricity through an electrochemical reaction of the synthetic gas produced by the reformer.

Abstract: A lightweight watercraft device designed for use by general consumers and those without means or desire for a traditional, larger boat. The device comprises a pilot seat, an outboard electric motor and steering means mounted to a lightweight foam hull wrapped in a composite shell. The hull comprises a central region bounded by two forward sweeping sides that form the bow of the vessel. The sides taper from bow to stern, terminating at the rear of the boat in a squared configuration. The hull is a unitary foam structure, wrapped in plys of composite material for structural reinforcement. A plank board is bonded between plys along the central axis of the boat, and provides support for the seat, a rear transom board and an area for carrying supplies. Mounted on the transom board is the outboard electric motor, which provides motive power for the vessel.

Abstract: A propulsion device for a marine vessel, the propulsion device comprising an electrical machine with integral magnetic gearing, which comprises three members, namely a first or inner rotor comprising a first plurality of permanent magnets, a second rotor in the form of a plurality of ferromagnetic pole pieces, and a stator which is associated with a plurality of 3-phase windings and to the periphery of which a plurality of second permanent magnets are fixed. The magnetic pole piece rotor is connected to a drive shaft provided with a propulsion means for providing propulsion to the marine vessel. The first or inner rotor is free to rotate about the drive shaft. The pole pieces of the second rotor are arranged to magnetically couple the permanent magnets of the first or inner rotor to the second permanent magnets on the stator.

Abstract: This ship 10 is a ship for transporting cargos such as containers, and it is possible to efficiently perform the cargo handling operation for cargos. A lower hold 16 is provided below a deck 15 in a hull 14. The deck 15 is provided with protruding portions 17 and 18 protruding in the right and left side directions of the hull, and a plurality of frameworks 21 each including vertical pillars 22 and 23 fixed to the respective protruding portions 17 and 18 and a horizontal beam 24 through which the vertical pillars 17 and 18 are connected to each other are provided for the deck 15. Openable partition covers 25 are provided between frameworks adjacent to each other, and an upper hold 26 is formed on the deck 15 by the partition covers 25 and the deck 15. The cargo handling operation for the lower hold 16 is performed by an inboard crane 33 provided in the lower hold 16, and at the same time, the cargo handling operation for the upper hold 26 is performed by a quay crane 37.

Abstract: A watercraft propulsion system is disclosed, including: a mechanical drive assembly capable of coupling to and being driven by a power source element of a propeller-based watercraft engine; and a pair of paddle drums coupled to and driven by the mechanical drive assembly, thereby propelling the watercraft through a body of water. For example, the mechanical drive assembly is adapted to couple to a drive shaft power source element, while or to an electrical wiring power source element within a positioning shaft. The paddle drums include blades capable of producing thrust via contact with a solid bottom surface containing the body of water, and/or with a top surface of the body of water. When applied to outboard engines, surface drive engines, air cooled marine engines and trolling motors, this system allows for navigation of extremely shallow water without damaging equipment, scarring lake beds or destroying native grasses.

Abstract: An electrical linear motor for propelling a marine vessel through a liquid medium, comprises a housing secured to the marine vessel and submerged in the liquid medium, an insert within the housing and having at least two electrical coil windings disposed on internal walls of the insert; a thruster subassembly moves between the internal walls of the insert, the thruster subassembly having a front cover, an internal channel with check valve and at least two sets of permanent magnets attached to the thruster subassembly and maintained in sufficiently close proximity to the electrical coil windings so that an electromagnetic field created by a controlled energizing of the electrical coil windings interacts with a magnetic field from the permanent magnets to provide a resulting linear force, which causes a reciprocating linear motion of the thruster subassembly, wherein the check valve is in an open position during a back stroke of the thruster subassembly so that the liquid medium flows freely through the thruste

Abstract: An electric boat comprising a boat housing with a rechargeable battery bank; two wind turbines disposed in sides of the boat housing, the wind turbines are driven by oncoming wind; a first turbine system operatively connected to the wind turbines via a first drive shaft; a transformer's power inverter/charge controller operatively connected to the rechargeable battery and to the first turbine system; an electric motor operatively connected to the transformer's power inverter/charge controller or rechargeable battery; jet pump for propelling the boat, the jet pump is operatively connected to the electric motor; and a plurality of solar panels disposed on the boat housing operatively connected to the rechargeable battery.

Abstract: The main propulsion and drive system of a merchant vessel such as a freighter or tank vessel, or a military vessel is supplemented by an auxiliary propulsion and drive system that includes at least one, but preferably a pair of auxiliary propellers that flank the main propeller at port and starboard positions and each of which are attached via a drive shaft through a gear train, which can optionally include a clutch mechanism, to an auxiliary motor or motors. In order to reduce the drag when the main propeller is disabled, segments of a wake field modifying propeller duct are mounted for repositioning to form at least a partial housing or cowling that diverts the water over the exterior surface of the duct and minimizes contact with the stationary blades of the main propeller as the vessel moves through the sea when powered by the auxiliary propulsion system.

Abstract: Some embodiments provide a propulsion system for a marine vessel that includes an electric motor-generator coupled between an internal combustion engine and a propeller through one or more clutches. The propulsion system includes a controller configured to adjust a torque load of the electric motor-generator based on factors such as rotational speed, propeller torque, and/or a peak torque output of the internal combustion engine. Some embodiments provide a propulsion assembly component including an electric motor-generator that can be installed in an existing marine propulsion system. Embodiments also provide methods for propelling a marine vessel.

Abstract: A method for operating a vessel is provided. The method can include determining the most efficient power source from a plurality of power sources for operating the vessel. The power sources can include a battery bank and an AC power source. The method can also include drawing power from the most efficient power source to operate the vessel; harvesting energy from electrical rotating sources; monitoring the battery bank; and charging the battery bank when a state of charge of the battery bank drops below a predetermined state of charge, wherein the charging is performed using the harvested energy, the AC power source, an external power source, or a combination thereof.