Abstract: A method for charging an auxiliary voltage source of a boat having an electric drive that is powered by a main voltage source of the boat, the auxiliary voltage source providing power for at least one additional component, is described. A protection and/or control circuit is electrically connected to the main voltage source via a DC-to-DC converter configured for power supply, and to the auxiliary voltage source via a switch or a reverse blocking valve. The auxiliary voltage source is charged via the main voltage source.

Abstract: A boat having an electric motor coupled with an electrical store is disclosed. The electrical store includes a storage element, and positive and negative poles in current-conducting connection with the storage element. An isolating circuit element is operatively connected to a user activatable emergency stop switch. The isolating circuit element is configured to, upon activation of the emergency stop switch, isolate the current-conducting connection between the storage element and at least one of the poles.

Abstract: A housing is disclosed. The housing contains one or more components, where at least one of the components is an electrical component and where the components do not fill the housing completely and a cavity remains within the housing. One or more filling elements are provided in the cavity which fill more than half of the cavity on contact with water.

Abstract: The invention relates to a boat with an electric drive that comprises electric components, especially an electric motor and an electric storage unit. The components are interconnected via an electric grid. At least one of the components is connected to the grid by means of a first connection means, the first connection means comprising first connection means main contacts for connecting the at least one component to the grid, and a second connection means being provided for connecting the electric storage unit to or disconnecting it from the grid. According to the invention, the first connection means comprises at least one pair of auxiliary contacts for connecting the at least one component to a monitoring line and said monitoring line is operatively connected to the second connection means.

Abstract: A cooling system and method is disclosed. A coolant line is in thermal contact with an electric motor of a boat drive. Coolant is pump able by a pump through the coolant line. The coolant line is in thermal contact with a component that is spatially separate from the boat drive. The coolant line has a first line section which is in thermal contact with the electric motor, a second line section which is in thermal contact with the component, and the first line section is detachably connectable to the second line section.

Abstract: The invention relates to a boat with an electric drive and a main voltage source, which provides power for the electric drive, and with an auxiliary voltage source, which provides power for at least one additional component. According to the invention, a charging device for charging the auxiliary voltage source is provided, wherein the charging device is connected to the main voltage source.

Abstract: The invention relates to a boat with an electric drive and an electrical store which has at least one storage element and a positive and a negative pole. The poles are in current-conducting connection with the storage element. An isolating means for isolating the current-conducting connection between at least one of the poles and the storage element is provided, and is operatively connected to an emergency stop switch which is directly activatable by the user of the boat.

Abstract: The invention relates to an electrical store having at least one store element (2) and one positive and one negative pole (3, 4), the poles (3, 4) being electrically conductively connected to the store element (2), and the electric motor (18) being connected to the poles (3, 4). A water sensor (5, 13) is provided, which determines whether one of the poles (3, 4) is in contact with water, the water sensor (5, 13) being operatively connected to a disconnection device (9), which is used to interrupt the electrically conductive connection between at least one of the poles (3, 4) and the store element (2) (FIG. 1).

Abstract: The invention relates to a boat with an electric drive that comprises electric components, especially an electric motor and an electric storage unit. The components are interconnected via an electric grid. At least one of the components is connected to the grid by means of a first connection means, the first connection means comprising first connection means main contacts for connecting the at least one component to the grid, and a second connection means being provided for connecting the electric storage unit to or disconnecting it from the grid. According to the invention, the first connection means comprises at least one pair of auxiliary contacts for connecting the at least one component to a monitoring line and said monitoring line is operatively connected to the second connection means.

Abstract: The invention relates to a boat having a battery that is located in a battery housing, the battery housing being provided with a waste gas outlet. In accordance with the invention the battery housing is provided with a waste gas outlet and the battery housing is gastight and watertight with the exception of the waste gas outlet, the waste gas outlet comprising a gas-permeable seal, in particular a diaphragm, and a pressure relief valve.

Abstract: A cooling system and method is disclosed. A coolant line is in thermal contact with an electric motor of a boat drive. Coolant is pump able by a pump through the coolant line. The coolant line is in thermal contact with a component that is spatially separate from the boat drive. The coolant line has a first line section which is in thermal contact with the electric motor, a second line section which is in thermal contact with the component, and the first line section is detachably connectable to the second line section.

Abstract: A mounting for fastening an outboard engine on a boat, in particular a kayak, has a support arm with a first fastening element for fastening the support arm on the boat. The first fastening element is a clamping device for receiving and fixing a knob on the boat.

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 circuit and a method for connecting a first electrical storage device and a second electrical storage device in parallel is disclosed. The first electrical storage device and the second electrical storage device have in each case a no-load voltage UBat1, UBat2 and an impedance R1 and R2, respectively, and have connecting terminals for charge withdrawal or charge supply. The no-load voltage UBat1 of the first storage device is greater than the no-load voltage UBat2 of the second storage device. In the case of a charge withdrawal, a charge is initially only withdrawn from the first storage device and the second storage device is connected in parallel with the first storage device when the difference of the voltage dropped across the connecting terminals of the first storage device and the no-load voltage UBat2 of the second storage device is less than a predetermined differential add-on voltage.

Abstract: A battery with at least one battery cell has two battery poles and current-conducting connections between the battery cells and the battery poles. A safety switching encompasses a current-limiting element in the connection between the battery cells and one of the battery poles. A switch is parallel to the current-limiting element and a control device closes the switch, if the current between the battery cells and the battery poles falls below a predetermined threshold minimum current.

Abstract: A mounting for fastening an outboard engine on a boat, in particular a kayak, has a support arm with a first fastening element for fastening the support arm on the boat. The first fastening element is a clamping device for receiving and fixing a knob on the boat.