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

Profitable. Sustainable. Powerful.

These innovative hybrid and electric systems support greener power transmission while delivering the reliability you expect from Twin Disc. Explore some of Twin Disc’s hybrid and electrification options, then contact our team of experts to learn about the endless custom solutions available to create the optimal system. With more than a hundred years of experience in the design of innovative power transmission products, Twin Disc understands your needs and delivers the solutions that earn your confidence.


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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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