Corvus Orca ESS

The Corvus Orca ESS is the most installed marine battery energy storage system worldwide, operating in over 700 vessels and maritime applications around the world.

Suitable for a variety of marine applications and vessel types, the Orca offers both energy and high power. Based on proven performance, the Corvus Orca set the industry standard in marine battery system safety and reliability. No other maritime energy storage system can compete with the installation count of the Orca.

Leading marine energy storage safety and reliability

Corvus Energy invests in innovation, quality, and continuous improvement. When the Corvus Orca ESS launched in 2016, it set new industry standards for marine energy storage. Corvus combined its industry-leading capabilities in marine battery system development with hands-on experience as the provider of the largest global base of maritime energy storage systems in operation to build the industry’s safest, most reliable ESS.


The Corvus Orca ESS is ideal for applications that need both energy and a high amount of power, moving large amounts of energy at an inexpensive lifetime cost per kWh. The Corvus Orca is suitable for both hybrid electric and all-electric marine applications and for use in the Corvus BOB all-in-one, installation ready battery room solution. Typical vessel types include:

  • Ferries
  • Tugs
  • Cruise Ships
  • Ro/Ro – Ro/Pax
  • Yachts
  • Offshore Vessels
  • Rigs
  • Fishing Vessels
  • Merchant Vessels
  • Port Cranes
  • Shore Charging
  • Fish Farms


  • High C-Rates – up to 3C
  • Installed on 400+ vessels around the world
  • Designed for voltages up to 1200 VDC
  • Low installation and commissioning time
  • Low life cycle cost
  • Enhanced reliability with contained power connections
  • Flexible and modularised design
  • 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

Corvus Energy safety innovations

Passive single-cell Thermal Runaway (TR) Isolation

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

Exceeds Class and Flag requirements for TR gas venting

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



Technical Specifications

Performance Specifications
C-Rate - (Discharge / Charge)up to 3C / up to 3C
Systems specifications
Battery Cell ChemistryLithium ion NMC / graphite
Single Module Size / Increments5,6 kWh / 50 VDC
Single Module Capacity 128 Ah
Single Pack Range38-136 kWh / 350-1200 VDC
Max Gravimetric Density - Pack77 Wh/kg | 13 kg/kWh
Max Volumetric Density - Pack88 Wh/l
Example Packs
Energy124 kWh
VoltageMax: 1100 VDC | Nom: 980 VDC | Min: 800 VDC
Dimensions - Vertical Pack - 124 kWhHeight: 2241 mm | Width: 865 mm | Depth 738 mm | 1628 kg
Dimensions - Horizontal Pack - 124 kWhHeight: 1260 mm | Width: 1730 mm | Depth 738 mm | 1726 kg
Example System - 8 Vertical packs
Energy992 kWh
VoltageMax: 1100 VDC | Nom: 980 VDC | Min: 800 VDC
Dimensions 8 x 124 kWhHeight: 2241 mm | Width: 6920 mm | Depth 738 mm | 13 024 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 pack level
Emergency Stop CircuitHard-wired
Ground Fault DetectionIntegrated
Disconnect Switchgear RatingFull load
General Specifications
Class ComplianceDNV , Lloyds Register, Bureau Veritas, ABS, RINA
Type ApprovalDNV , Bureau Veritas, ABS, RINA
Ingress ProtectionSystem: IP44
CoolingForced Air
Vibration and shockUNT38.3, DNV 2.4, IEC 60068-2-6
EMCIEC 61000-4, IEC 60945-9, 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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