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Marine Propulsion using Batteries

  • An overview of marine propulsion using batteries is provided, with a focus on current battery-powered and hybrid ship applications. The reasons why passenger vessels and ferries are well suited to battery propulsion, given their short routes and access to charging infrastructure, are explained.
  • The hybrid use of batteries in offshore and coastal vessels with complex operating profiles is explained. How batteries can optimize engine loading, improve redundancy, and reduce maintenance requirements is highlighted.
  • Battery energy density is discussed, and lithium batteries are compared with conventional battery technologies. Trade-offs between different battery chemistries, packaging effects, and the impact of auxiliary systems on usable energy density are explained.
  • Operational constraints such as state-of-charge limits and battery degradation are addressed. How these limitations reduce usable battery capacity and affect the feasibility of fully battery-powered vessels is explained.
  • Challenges related to system weight, volume, cost, and life-cycle emissions are presented through a case study of a coastal vessel. Why hybrid solutions are needed to compensate for battery energy density limitations while reducing long-term emissions is highlighted.
Updated on Jan 18, 2026