Technology & Specifications

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Orca ESS Solutions

The world’s most advanced maritime ESS (Energy Storage Systems). Designed and built specifically for the maritime industry, the Orca ESS product line from Corvus Energy represents the future of maritime ESS solutions. Corvus combined its industry leading research & development capabilities and knowledge gained from having the largest global installed base of ESS solutions, to build the industry’s safest, most reliable, highest-performing and most cost-effective maritime ESS product line, which includes: Orca Energy and Orca Power.

Orca Energy

Orca Energy is ideal for applications that are primarily energy capacity driven, moving large amounts of energy at an inexpensive lifetime cost per kWh. ORCA ESS is suitable for both all-electric and hybrid installations.

  • Ferries
  • Cruise ships
  • Ro/Ro – Ro/Pax
  • Super Yachts
  • Yachts
  • Offshore vessels
  • Rigs
  • Tugs
  • Fishing vessels
  • Merchant vessels
  • Port cranes
  • Shore charging
  • Fish farms







• Price per kWh reduced by 50%

• Highest C-Rates in the industry – up to a 6C peak C-rate

• Increased cycle life – lowering total system cost and extending ESS Lifespan

• Unparalleled energy density – 50% volume & 35% weight reductions

• Connection & commissioning time reduced by 80%

• Enhanced EMI immunity design for maritime environments

• Economical upfront & through-life costs = lower total cost of ownership

• Power connections contained within rack – no manual connections, enhanced reliability, increased safety

• Designed for pack voltages up to 1200VDC

• Scalable beyond 10MWh

• Industry-proven 4th generation BMS

• Easily monitored through the Watchman™ ESS Advisory Portal


Cell-level Thermal Runaway (TR) Isolation

  • – True cell-level thermal runaway isolation – TR does not propagate to neighbouring cells
  • – Isolation NOT dependant 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

Additional fire suppression system not required

Technical Specifications

C-rate – Peak discharge 6C
C-rate  – Charge/discharge 3C
Pack Sizing


50-1200V I 5,7 – 136 kWh


Energy 125kWh
Voltage Max: 1100 VDC I Nominal: 980 VDC I Min: 870 VDC
Cooling Forced Air/ Liquid Cooling
Dimensions (vertical) Height: 2241mm I Width: 865mm I Depth: 738mm
Dimensions (horizontal) Height: 1260mm I Width: 1730mm I Depth: 738mm


1620kg (3571lb)


EMC IEC 61000-4, CISPR16-1, 2, IEC60945-9
Ingress Protection System: IP44
Vibration and Shock UNIT 38.3, DNV 2.4, IEC 60068-2-6
Class Compliance DNV-GL, Lloyds Register, Bureau Veritas, ABS
Type Approval


DNV-GL, Bureau Veritas, ABS, RINA


Voltage Isolation 7,2 kV (IEC 60947-2)
Thermal Runaway anti-propagation Cell-level; DNV-GL Pt.6 Ch.2, NMA 2016 circular
Fire suppression reccomended Per SOLAS (machinery space)
Disconnect circuit Hardware-based fail-safe-for over-temp, over voltage
Maximum current parameter Updated 2x per second
Faults communicated Over-voltage, under-voltage, over-temperature
Short Circuit protection Fuses included
Disconnect switchgear rating Full load
Emergency stop circuit Hard-wired
Ground fault detection