Corvus Blue Whale ESS

The Corvus Blue Whale marine energy storage system is designed specifically for large vessels, like Cruise Ships and Ro-Pax, and vessels that require a large amount of energy.

The Corvus Blue Whale marine battery energy storage system is designed for use in Cruise, Ro-Pax, Ro-Ro, Mega Yachts, and other vessels where the operational profile calls for low C-Rate, slow battery system charge and discharge rates, and emissions-free sailing over long periods of time.

Extending the range of zero-emission operations for Cruise, Ro-Pax, and other large maritime vessels

Blue Whale was developed with large marine energy storage installations in mind, specifically battery systems that require more than 10MWh total system energy. Optimization for energy density enables Blue Whale to deliver more power. This in turn extends the vessel’s ability to maintain zero-emission operations, including during transit through emissions-restricted zones and zero-emission port stays.


The Corvus Blue Whale ESS is ideal for marine applications that require a large amount of energy at a cost-effective kWh price. Typical vessel-types include:

  • Cruise Ships
  • Ro-Ro / Ro-Pax
  • Yachts
  • Merchant Vessels
  • Workboats
  • Inland Vessels
  • Sightseeing Vessels


  • Industry leading volumetric and gravimetric room energy density
  • Designed for voltages up to 1140 VDC
  • Low installation and commissioning time
  • Very cost-efficient for large installations
  • Enhanced reliability with contained power connections
  • Weight and volume reduced ~30% and ~50 % compared to Corvus Orca ESS
  • Flexible and modularised design
  • Service aisles optional
  • Passive single-cell Thermal Runaway protection
  • Scalable capacity and voltage according to vessel requirements
  • Industry-proven Battery Management System (BMS)
  • Remote monitoring capabilities
  • Enhanced EMI immunity design for maritime environments

Advancing marine energy storage technology with the Corvus Blue Whale

The Corvus Orca ESS, the most installed marine energy storage system worldwide, set the industry standard for maritime energy storage reliability and safety. The Blue Whale design incorporates the unsurpassed safety features of the Orca, and additionally provides key advances required to meet the energy demands of large vessels. This includes improved energy density, with weight and volume reduced by ~30% and ~50 % compared to Orca. Learn more about Blue Whale via the video and product specifications below.

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


Exceeds Class and Flag standards TR Gas venting

  • Integrated thermal runaway gas exhaust system
  • Easily vented to external atmosphere rather than the battery room



Technical Specifications

Performance Specifications
C-Rate - Peak (Discharge / Charge)1C / 1C for 20 minutes
C-Rate - Continuous (Discharge / Charge)0,7C / 0,7C
System Specifications
Battery Cell ChemistryLithium Iron Phosphate
Single Module Size/Increments44.35 kWh / 80 VDC
Single Module Capacity560 Ah
Single Pack Range301-4967 kWh / 560 - 1120 VDC
Max Gravimetric Density - Room105 Wh/kg | 9,6 kg/kWh
Max Volumetric Density - Room58 Wh/l
Example Pack - 6 strings (14 modules/string)
Energy3726 kWh
VoltageMax: 1226 VDC | Nom: 1109 VDC | Min: 840 VDC
Dimensions Height: 2755 mm | Width: 5560 mm | Length 10 047 mm
Weight37 296 kg
Example System - 4 packs of 6 Strings (14 modules/string)
Energy14 902 kWh
VoltageMax: 1226 VDC | Nom: 1109 VDC | Min: 840 VDC
DimensionsHeight: 2755 mm I Width: 5560 mm I Length: 10 047 mm
Weight149 184 kg
Safety Specifications
Thermal Runaway Anti-PropagationPassive cell-level thermal runaway isolation with exhaust gas system
Fire SuppressionPer SOLAS, class and Corvus recommendation
Disconnect CircuitHardware-based fail-safe for over-temperature and over-voltage
Short Circuit ProtectionFuses included on the module and string level
Emergency Stop CircuitHard-wired
Ground Fault DetectionIntegrated
Disconnect Switchgear RatingFull load
General Specifications
Class Compliance (Pending)Lloyds Register, Bureau Veritas, ABS
Type ApprovalDNV
Ingress ProtectionSystem: IP44
CoolingForced air
Vibration and ShockUNT38.3, DNVGL-CG-0339, IEC 60068-2-6
EMCIEC 61000-4, CISPR16-2-1

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

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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

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Offshore Wind

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

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Offshore Oil & Gas

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

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Fishing and Aquaculture

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

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merchant vessel


Deep sea vessels, Hybrid short sea merchant vessels

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


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Subsea Heave Compensation, ROV and Seabed

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