Corvus Dolphin Energy NxtGen ESS

The Corvus Dolphin Energy NxtGen marine energy storage system is designed for vessels that require a high-energy battery system for lightweight applications.

The Corvus Dolphin Energy NxtGen offers outstanding energy density, reasonable power density, and the highest level of marine battery safety. Its space-efficient, high-energy battery system design is perfect for applications where lightweight is essential.

Fit more battery power into less space.

Maximize use of available battery room space to achieve higher levels of battery system output and capacity with the Corvus Dolphin Energy NxtGen. The space efficient, rack-free design enables energy dense battery modules to be stacked in various configurations, like compact, high-energy building blocks. Eliminating the limitation of fixed-height racks provides the flexibility to fully utilize the space available, fitting more battery power within a limited footprint.


Dolphin Energy NxtGen ESS is ideal for ships with long, slow charges and discharges where lightweight is essential. The system is suitable for both hybrid electric and all-electric maritime applications. Typical vessels include:

  • Ferries
  • Yachts
  • Canal Boats
  • Tourist Vessels
  • Sightseeing Vessels


  • Low C-rate for slow charge and discharge
  • Low weight
  • Designed for voltages up to 1200 VDC
  • Flexible installation
  • Low life cycle cost  
  • Easy and safe plug and play connections
  • Very flexible and modularized 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

Next generation marine energy storage, advancing maritime battery technology with the Corvus Dolphin Energy NxtGen.

Leveraging the latest advances in marine battery energy storage technology and zero-emission solutions, the Dolphin Energy NxtGen is the newest ESS in the Corvus Energy family of products. Its next generation design builds upon learnings from our experience with over 1,000 projects and millions of system operational hours as the maritime sector leader in battery energy storage and sets new industry standards in marine battery systems.

Corvus Energy safety innovations

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

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



Technical Specifications

Performance Specifications
C-Rate - Peak (Discharge / Charge)1,1C / 1,0C for 10 seconds
C-Rate - Continuous (Discharge / Charge)0,5 C / 0,5C
System Specifications
Battery Cell ChemistryLithium ion NMC / graphite
Single Module Size / Increments8,2 kWh / 50 VDC
Single Module Capacity190 Ah
Single String Range33-197 kWh / 130-1205 VDC
Max Gravimetric Density - String168 Wh/kg | 5,96 kg/kWh
Max Volumetric Density - String212,5 Wh/l
Example Pack - 24 Modules
Energy197 kWh
VoltageMax: 1205 VDC | Nom: 1046 VDC | Min: 864 VDC
Dimensions (Vertical)Height: 2775 mm | Width: 500 mm | Depth: 666 mm | 1163 kg
Example System - 30 Strings
Energy3941 kWh
VoltageMax: 797 VDC | Nom: 697 VDC | Min: 576 VDC
Dimensions - Assumes 4 stacks deepHeight: 1975 mm | Width: 3980 mm | Depth: 4026 mm | 23867 kg
Safety Specifications
Thermal Runaway Anti-propagationPassive cell-level thermal runaway isolation
Fire SuppressionPer SOLAS, class and Corvus recommendation
Disconnect CircuitHardware-based fail-safe for over-temperature and over-voltage
Short Circuit ProtectionFuses included on cell level
Emergency Stop CircuitHard-wired
Ground Fault DetectionIntegrated
Disconnect Switchgear RatingFull load
General Specifications
Class ComplianceDNV GL, Lloyds Register, Bureau Veritas* (*Project Approval)
Type ApprovalPending
Ingress ProtectionIP55
CoolingForced air
Vibration and ShockUNT38.3, DNV 2.4

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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