SCHOTTEL propulsion systems for the first fully electric American tugboat eWolf


Image courtesy of SCHOTTEL

Posted on December 10, 2021 at 11:11 AM by

The maritime executive

[By: SCHOTTEL]

Crowley’s new 25-meter eWolf vessel, the first fully electric tugboat to be built and operated in the United States, will be fitted with SCHOTTEL systems. As part of the fully integrated electrical package, SCHOTTEL supplies two RudderPropellers type SRP 430 with LE-Drive (“Embedded L-Drive”). MariHub, the IoT data gateway and monitoring solution, completes SCHOTTEL’s delivery range.

Built at the Master Boat Builders shipyard in Coden, Alabama, and designed by US firm Crowley Engineering Services, it is expected to enter service by mid-2023. eWolf will take care of the arrivals and departures of ships at the Port of San Diego in California.

Joshua Ellis, Vice President of Vessel Support Services at Crowley: “The zero emission design of the eWolf includes a propulsion system that will provide a sustainable vessel support solution with improved safety and agile maneuvering capabilities . Crowley looks forward to working with experienced and innovative partners like SCHOTTEL to deliver this revolutionary Vessel Assistance Tug that will provide San Diego customers with long-lasting, high-performance operations.

Space-saving, efficient, silent

The eWolf propulsion system consists of two electrically driven SCHOTTEL RudderPropellers propellers type SRP 430 LE (2,050 kW each) with propeller diameters of 2.5 meters. Thanks to this, the ship will achieve a pulling power of about 70 short tons.

The SRP 430 LE is characterized by its compact design. Due to the extremely low installation height of the LE-Drive and the omission of the upper gearbox, the mechanical efficiency is increased by about 3% and, at the same time, fuel consumption is reduced.

Emission-free towing operations

The eWolf will have a 6 MWh energy storage system of sufficient capacity to allow the vessel to provide a full day of normal work without using a drop of fuel. The batteries can power the propulsion system almost instantly, ensuring efficient support of ships and port escort services without emissions.

Tug systems are designed for rapidly changing load requirements. The ship has two generators on board for emergency use and to allow longer transit distances at reduced speed.

The products and services described in this press release are not endorsed by The Maritime Executive.


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