You can learn here more about hybrid propulsion system used by SeaBoater yachts.

WORLDWIDE FIRST SERIALIZED HYBRID PROPULSION SYSTEM: The environmentally friendly HYBRID SOLUTION marks a new chapter in the history of pleasure boat propulsion systems. It not only assures zero emission and low speed maneuvering in harbors, noiseless drive on inland waters and nature reserves, but also eliminates the need for separate generator units for other onboard equipment. The “zero emission” electric drive mode allows a speed of 5 knots using solely electric propulsion and switches to the combustion engine with an easy turn of the ignition key. The ingenious propulsion then gets “boosted” by the electric drive and enables quicker acceleration, lowering fuel consumption, improving response and dynamics. Significantly reduced maintenance costs and improved ease of service are further irrevocable arguments that hybrid engines are introducing a serious technological novelty.


4 electric motor operates in 4 modes:

1. STARTER MODE
In Starter Mode, the combustion engine can be started with the electric motor. The conventional starter motor can be eliminated or will remain redundant.

2. GENERATOR MODE
In Generator Mode, the extended battery pack is optimized and charged.

3. ELECTRIC CRUISE MODE
In Electric Cruise Mode, the boat is driven purely by the electric motor. The battery pack is constantly monitored on its state of charge and battery condition. This is brought to the attention of the driver through the STEYR CONTROL CENTER (SCC).

4. BOOST MODE
In the lower speed range, depending on dynamic requirements of the driver and the battery condition, the Boost Mode is used and the combustion engine is then supported by the massive torque of the electric motor. The e-motor supports the coupling and decoupling of the combustion engine. An improved response of the drive unit occurs through the boost mode.

The STEYR ELECTRONIC CONTROL (SEC) unit forwards the driver demands via CAN protocol to the engine control unit (ECU) and hybrid control unit (HCU). Both control units regulate the torque composition of drive units depending on dynamic requirement. At the same time, the condition of the components (batteries, e-motor, combustion engine, environmental conditions) is monitored through the control units. The control units have adjustable functions and engine characteristics in order to coordinate all drive train variants to the driver’s demands in the appropriate boat.