MAN Engines

A comparison of marine hybrid system operating modes

MAN Marine Hybrid Systems in comparison
hybrid systems:

The following operating modes form the basis for the application-specific adaptation of the system designs: performance, efficiency and comfort.

Zero-emission mode

Energy for drive and power consumption provided by the battery

Emission-free and whisper-quiet – in zero-emission mode, the energy for the drive as well as the power consumption is provided exclusively by the battery. The battery can be charged in three ways: Shore connection in port, on-board gensets, main propulsion engines.


  • No noise and exhaust gas emissions
  • No vibration
  • Access to special protection zones
MAN Hybrid System: Zero-emission mode

Diesel-electric mode

Reduce noise and exhaust gas emissions and save fuel

In diesel-electric mode, power supply and propulsion are provided by the existing on-board gensets and supported by the battery. This reduces main drive operating hours.


  • Low noise and exhaust gas emissions
  • Low vibration
  • Efficient operation (low fuel consumption)

Cross-over mode

Use different operating modes and maximise the economic benefit

In a two-engine system cross-over mode, both drivelines are operated in different modes. While one driveline is in diesel mode, the electric motor operates as an alternator and provides the electrical energy for the ship. In the second driveline, the main diesel engine is disengaged so that the e-engine receives its energy from the first diesel engine. It operates in motor mode and thus provides the drive energy.


  • Extremely economical operation
  • High range
  • Low vibration
  • Extended operating time until maintenance (TBO)

Hotel mode

Always ready for operation thanks to guaranteed power supply from the battery

In comfortable hotel mode, power is supplied by the battery alone while the diesel engines are switched off. The innovative technology ensures that power consumption is possible for an extended period without diesel engines. Independently of this, the batteries can be charged in parallel via a charging connection.


  • No noise & exhaust gas emissions
  • No vibrations
  • Full operational readiness without engines

Boost mode

Maximum power thanks to the interaction of combustion engines and battery-powered electric motors

Here, the combustion and battery-powered electric motors work hand-in-hand and complement each other. When power is needed, the electric motor provides additional energy from its power reserves. Thus, the boost mode offers the highest power density and enables maximum power. Working together, the 12-cylinder diesel engine and the e-drive can thus achieve performance equivalent to that of a pure 16-cylinder engine.


  • Combining high performance with the advantages of hybrid and zero-emission propulsion
  • Up to 20 % increase in power compared to conventional drive

Diesel mode

Full speed ahead plus charge power for the battery at the same time

In classic diesel mode, the energy for the drive is provided by the conventional diesel engine, or diesel engines in multi-engine systems. In this mode, the electric motor rotates along without function and without generating electricity. In addition, electricity can be generated in diesel mode to charge the batteries. In this case, the operating hours of the gensets are reduced.


  • Established drive
  • High range
  • Familiar flexible driving styles from economical to sporty

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