Abstract: A fuel cell watercraft includes: a hull; an electric motor Serving as a power source adapted to generate propulsion of the hull; a fuel cell unit adapted to supply electric power to the electric motor; a hydrogen fuel tank adapted to supply hydrogen fuel to the fuel cell unit; a secondary battery serving as an auxiliary power supply for the fuel cell unit; and power regulation means for regulating the electric power supplied to the electric motor, in which the hull includes first and second storage spaces isolated from each other, the first and second storage spaces include equipment hatches able to be opened and closed by lid members, the fuel cell unit and the hydrogen fuel tank are housed in the first storage space, and the secondary battery and the power regulation means are housed in the second storage space.

Abstract: A fuel cell watercraft includes: a hull; an electric motor Serving as a power source adapted to generate propulsion of the hull; a fuel cell unit adapted to supply electric power to the electric motor; a hydrogen fuel tank adapted to supply hydrogen fuel to the fuel cell unit; a secondary battery serving as an auxiliary power supply for the fuel cell unit; and power regulation means for regulating the electric power supplied to the electric motor, in which the hull includes first and second storage spaces isolated from each other, the first and second storage spaces include equipment hatches able to be opened and closed by lid members, the fuel cell unit and the hydrogen fuel tank are housed in the first storage space, and the secondary battery and the power regulation means are housed in the second storage space.

Abstract: A fuel cell watercraft includes: a hull; an electric motor serving as a power source adapted to generate propulsion of the hull; a fuel cell unit adapted to supply electric power to the electric motor; a hydrogen fuel tank adapted to supply hydrogen fuel to the fuel cell unit; a secondary battery serving as an auxiliary power supply for the fuel cell unit; and power regulation means for regulating the electric power supplied to the electric motor, in which the hull includes first and second storage spaces isolated from each other, the first and second storage spaces include equipment hatches able to be opened and closed by lid members, the fuel cell unit and the hydrogen fuel tank are housed in the first storage space, and the secondary battery and the power regulation means are housed in the second storage space.

Abstract: A fuel cell watercraft (1) includes an electric outboard motor (6); a fuel cell unit (2) adapted to supply electric power to the electric outboard motor; a hydrogen fuel tank (3) adapted to supply hydrogen fuel to the fuel cell unit; and a storage space (10) adapted to house the fuel cell unit and the hydrogen fuel tank, wherein the fuel cell watercraft is configured such that a relief valve (30) is installed on the hydrogen fuel tank, the storage space includes a hatch (11c) used to introduce the fuel cell unit and the hydrogen fuel tank, a lid member (11b) used to tightly close the hatch, and means (11a) for detecting unauthorized opening of the lid member, and when the unauthorized opening is detected, the relief valve is opened.

Abstract: A fuel cell watercraft (1) includes an electric outboard motor (6); a fuel cell unit (2) adapted to supply electric power to the electric outboard motor; a hydrogen fuel tank (3) adapted to supply hydrogen fuel to the fuel cell unit; and a storage space (10) adapted to house the fuel cell unit and the hydrogen fuel tank, wherein the fuel cell watercraft is configured such that a relief valve (30) is installed on the hydrogen fuel tank, the storage space includes a hatch (11c) used to introduce the fuel cell unit and the hydrogen fuel tank, a lid member (11b) used to tightly close the hatch, and means (11a) for detecting unauthorized opening of the lid member, and when the unauthorized opening is detected, the relief valve is opened.

Abstract: A fuel cell watercraft includes: a hull; an electric motor serving as a power source adapted to generate propulsion of the hull; a fuel cell unit adapted to supply electric power to the electric motor; a hydrogen fuel tank adapted to supply hydrogen fuel to the fuel cell unit; a secondary battery serving as an auxiliary power supply for the fuel cell unit; and power regulation means for regulating the electric power supplied to the electric motor, in which the hull includes first and second storage spaces isolated from each other, the first and second storage spaces include equipment hatches able to be opened and closed by lid members, the fuel cell unit and the hydrogen fuel tank are housed in the first storage space, and the secondary battery and the power regulation means are housed in the second storage space.

Abstract: A corrosive environment sensor for measuring corrosive environment inside a space between a first member that is a conductor and a second member that is a conductor or insulator includes: a base having a surface which cam face the first member that is a conductor; and an electrode which is provided on the surface of the base and formed with a material different in ionization tendency from the first member and which faces at a distance the first member so as to form a galvanic coupling with the first member, and the corrosive environment sensor measures a galvanic current between the electrode and the first member.

Abstract: A corrosive environment sensor for measuring corrosive environment inside a space between a first member that is a conductor and a second member that is a conductor or insulator includes: a base having a surface which cam face the first member that is a conductor; and an electrode which is provided on the surface of the base and formed with a material different in ionization tendency from the first member and which faces at a distance the first member so as to form a galvanic coupling with the first member, and the corrosive environment sensor measures a galvanic current between the electrode and the first member.