Corvus Dolphin Power

The Dolphin Power ESS is specifically designed for lightweight applications. Dolphin Power combines outstanding power density and a reasonable energy density with the highest level of safety, setting a new industry standard for maritime energy storage systems.

The flexible design of the Dolphin Power allows the system to be stacked in various directions enabling high space efficiency in compact installations. Dolphin Power is ideal for high-speed vessels that need to boost propulsion to
reach max speed, or vessels that must recharge the batteries quickly and often.


Dolphin Power is ideal for vessels where light weight is essential but where high charge or discharge power is also required. Typical vessels are:

  • Fast ferries
  • Ferries
  • Yachts
  • Tourist vessels
  • Cruise ships
  • Sightseeing vessels


  • High C-Rate, up to 4,4C peak
  • Low weight
  • Designed for voltages up to 1000 VDC
  • Flexible installation
  • Low life cycle cost  
  • Easy and safe plug and play connections
  • Very flexible and modularised design
  • Passive single-cell Thermal Runaway protection
  • Reduces fuel, emissions, noise and maintenance
  • Industry-proven Battery Management System (BMS)
  • Remote monitoring

Corvus Energy safety innovations

Passive-Single-Cell-level Thermal Runaway (TR) Isolation

  • True cell-level thermal runaway isolation
  • TR does not propagate to neighbouring cells
  • Isolation NOT dependent on active cooling



Technical Specifications

Performance Specifications
C-Rate - Peak (Discharge / Charge)4,4 C / 2,0C for 10 seconds
C-Rate - Continous (Discharge / Charge)2,2C / 1,6C
System Specifications
Single Module Size / Increments7,8 kWh / 128 VDC
Single Pack Range7,8-62,4 kWh / 128-1024 VDC
Max Gravimetric Density - Pack125 Wh/kg | 8,0 kg/ kWh
Max Volumetric Density - Pack75 Wh/l
Example Pack - 7 Modules
Energy54,4 kWh
VoltageMax: 896 VDC | Nom: 805 VDC | Min: 672 VDC
DimensionsHeight: 2380 mm | Width: 655 mm | Depth: 500 mm | 436 kg
Example System - 4 Packs
Energy218,4 kWh
VoltageMax: 896 VDC | Nom: 805 VDC | Min: 672 VDC
DimensionsHeight: 2380 mm | Width: 2620 mm | Depth 500 mm | 1743 kg
Safety Specifications
Thermal Runaway Anti-PropagationPassive cell-level thermal runaway isolation
Fire Suppresion Per SOLAS, class and Corvus recommendation
Disconnect CircuitCell individual fail-safe for over-temperatur and over-voltage
Short Circuit ProtectionFuses included on cell, module and pack level
Emergency Stop CircuitHard-wired
Ground Fault DetectionIntegrated
Disconnect Switchgear RatingFull load
General Specifications
Class ComplianceDNV GL, Lloyds Register, Bureau Veritas, ABS, RINA
Type ApprovalDNV GL
Ingress ProtectionSystem: IP23
CoolingForced air
Vibration and ShockUNT38.3, DNV 2.4
EMCIEC 60945-9

Market Segments

Cruise and Ferry

Electric and Hybrid RoPax, Electric and Hybrid Car Ferries, Hybrid Powered Cruise Ships, Electric and Hybrid Ferries, Electric and Hybrid Yachts, Electric and Hybrid Passenger Ferries

Learn more
Corvus is the leading provider of marine battery energy storage systems for maritime applications, including electric and hybrid tugboats and workboats.

Tugs and Workboats

Electric and Hybrid Tugboats, Electric and Hybrid Workboats

Learn more

Offshore Wind

Non Vessel Wind Installations, Offshore Wind Installation Vessels, Offshore Wind Service Vessels

Learn more

Offshore Oil & Gas

DP2 vessels, DP3 Vessels, Oil and Gas, Offshore support vessels

Learn more

Fishing and Aquaculture

Fish farm support vessel, Fish farms, Fishing, Fish Farming and Aquaculture

Learn more
merchant vessel


Deep sea vessels, Hybrid short sea merchant vessels

Learn more
Corvus Energy is the leading provider of marine energy storage systems, including solutions for hybrid port equipment and electric vessel charging.


Learn more


Subsea Heave Compensation, ROV and Seabed

Learn more