Parallel Hybrid: Diesel + Dual Electric Motor with Energy Storage

This parallel hybrid system features dual electric motors. It’s best suited for vessels such as mid-size passenger vessels, patrol boats, or workboats/fishing boats requiring higher electric power to accomplish their duty cycle in restricted areas and zero-emission zones.


High Voltage

Data / Command Signals

System Overview

  • Parallel hybrid using diesel and electric power
  • During low-power operation, the e-motor can use excess diesel power to generate electricity
  • In high-demand phases, electric power can boost diesel power
  • Machinery compartments can be located to optimize cargo space or meet class requirements

RePTO Drive with MasterClutch™

  • Installed between marine diesel engine and marine transmission
  • Supports all features of QuickShift® transmission
  • Permits power generation through PTO/PTI in forward, neutral and reverse
  • Prevents engine back-driving during electric-only operation

Marine Transmission

  • Based on standard marine transmission for worldwide support
  • No trailing pump needed; transmission is lubricated as it’s driven by diesel or e-motor(s)
  • Efficient design minimizes losses

Propulsion Controller

  • Twin Disc standard propulsion controller and operator interface

Hybrid Controller

  • Manages power distribution, interfacing with propulsion controller and high voltage equipment


  • Selection based on application characteristics (torque, installation)

Inverter, High Voltage Equipment

  • Controlled and monitored by hybrid controller

Energy Storage & BMS

  • Selection based on application characteristics

Diesel Engine

  • Not supplied by Twin Disc

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Twin Disc specialists are available to work with your technical experts to select the optimal configuration and components for your specific application.

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