Powering Vessels Safely
Designed for the Future

Marine Energy Storage System

  • Extreme Safety: Cell-level thermal runaway isolation.
  • 10,000+ Cycles: Industry-leading lifespan.
  • Plug-and-Play: cable connections only.
  • Powerful and robust: up to 2.5C discharge
  • Zero Liquid Cooling: Natural air-cooling simplicity.

Prevent

Mitigates file / explosion risks even in harsh conditions.

Long life cycle

Optimized for >10,000 cycles at 80% depth of discharge (DoD).

Ease of Integration

Modular design, cable connection only.

Eco-Conscious

Non-toxic LFP chemistry for sustainable lifecycle management.

Where to use

Passenger ships, cargo ships, offshores,and yachts

Engineered for
Marine Excellence

Safety-Centric Design

Cell-level thermal runaway containment. IP67 protection (validated by saltwater immersion tests).

Cylindrical cells structure

Chained cylindrical cells structure in module.  Metal-covered cells: Even heat dissipation, low overheat risk

Light ventilation

Passive natural cooling.  No pumps, No gas ducts or liquid cooling needed.

High C-rate sustain

Discharge: up to 3C, Charge: up to 1C

Cylindrical Cell Workforce

  • Chemistry: Cylindrical LFP (LiFePO₄), 4.6Ah, 3.2V nominal.
  • Safety: Individual CID fuse per cell.
  • Robustness: Operates at -20°C to 68°C; minimal gas release during thermal events (2.29–6.9L/cell).
  • Energy Density: 14.7Wh/cell—5% of prismatic cells, reducing propagation risk.
  • Heat dissipation: 400% more surface area comparing with prismatic cell.
  • Even heat dissipation: center of cell is only 13mm away from the casing
  • True cell-level thermal runaway isolation Energy of a cell is not enough to open the CID of neighboring cells
  • 300% discharge rate compared with prismatic cell as multi tap out cell structure

Modules

  • Config: 16S24P (51.2V, 110.4Ah, 5.65kWh).
  • Design: IP67-rated steel enclosure; natural cooling via cell spacing (400% more surface area vs. prismatic).
  • Physical: 345 × 486 × 221 mm (W×D×H); 54.4kg.
  • Performance: Max 110A charge (1C), Up to 330A discharge (3.0C).

BMS

  • 3-Tier Architecture:
  • BAU (Battery Array Unit): Central control.
  • BMU (Battery Management Unit): Per-string monitoring.
  • BSU (Battery Sub-Unit): Cell-level SoC/SoH tracking.
  • Features: Multi-string support, fault isolation, remote diagnostics via Starlink/G60.

Certifications

  • Safety Tests:
  • Thermal Runaway: UL9540A-compliant (gas release <0.5L/Ah).
  • Saltwater Immersion: IP67 validated (CNAS L5998).
  • Flame Resistance: 1-hour external fire test (CNAS L6957).
  • Features: Multi-string support, fault isolation, remote diagnostics via Starlink/G60.

Warranty

  • 10+ Years:
  • Covers defects and performance degradation (80% SoH at 10,000 cycles).

System Specifications

System Specifications
Item Specification
Rack Heights 2219 mm (R18), 1760 mm (R14), 1311 mm (R10)
Rack Width & Depth W840 mm, D500 mm
Cell Type LFP 4.6Ah Cylindrical
Single module Energy / Nominal Voltage 5.45 kWh / 51.2V
Single string Max. Voltage 1000 V
Max. Gravimetric Density — String 104 Wh/kg
Max. Volumetric Density — String 102 Wh/litre
Max. Energy Density Footprint — String 227 kWh/m²
Performance Specifications
Item Specification
Discharge C‑rate (Peak 5 min / Continuous) 3C / 2C
Charge C‑rate — Continuous 1C
Cycle Life (80% DoD, 0.5C) 10,500

ESS Module
Configuration

ITEM Specifications Remarks
Configuration 16S24P
Nominal Voltage 51.2V
Nominal Capacity 110.4 AH / 5,652 WH
Min Capacity 108 AH
Max Charge Voltage 56.8V 3.55V for cell in case of unbalance
Discharge Cut-off Voltage 48V Leave some margin for long lifecycle
Max Continuous Charge Current 110A (1C)
Max Continuous Discharge Current 220A (2C)
Peak Discharge Current Up to 330A (3C) For 5 min#
Operating Temperature Charge: -10°C ~ 50°C
Discharge: -20°C ~ 65°C 		Cell surface temperature
ESS module Size (W*D*H) 345mm × 486mm × 221mm
ESS module weight 54.4kg
IP level IP67

ESS String
Configuration

Model Nominal Voltage Nominal Capacity
MS001-04-01 204.8V 110.4Ah / 22.67kWh
MS001-05-01 256.0V 110.4Ah / 28.26kWh
MS001-06-01 307.2V 110.4Ah / 33.91kWh
MS001-07-01 358.4V 110.4Ah / 39.57kWh
MS001-08-01 409.6V 110.4Ah / 45.22kWh
MS001-09-01 460.8V 110.4Ah / 50.87kWh
MS001-10-01 512.0V 110.4Ah / 56.52kWh
MS001-11-01 563.2V 110.4Ah / 62.18kWh
MS001-12-01 614.4V 110.4Ah / 67.83kWh
MS001-13-01 665.6V 110.4Ah / 73.48kWh
MS001-14-01 716.8V 110.4Ah / 79.13kWh
MS001-15-01 768.0V 110.4Ah / 84.79kWh
MS001-16-01 819.2V 110.4Ah / 90.44kWh
MS001-17-01 870.4V 110.4Ah / 96.09kWh

DNV Approved
Product Installation for Classified Vessels

This approval underscores our dedication to innovation, rigorous quality standards, and delivering reliable solutions for the maritime industry.

We are thrilled to announce that GNW Power Limited has received official DNV approval, confirming compliance with DNV rules for classification – Ships, offshore units, and high speed and light craft. This certification verifies that our products are accepted for installation on all vessels classed by DNV, in line with the relevant DNV guidelines and standards.

Engineered for Reliability:
Our Comprehensive Testing

Our batteries undergo stringent safety evaluations to deliver unmatched reliability and performance in every scenario.

Robust Saltwater Trial
  • Survives 3-minute saltwater exposure.
  • Safe discharge with heat/smoke.
  • No damage after 7-day monitoring.
Intensive Flame Resistance Evaluation
  • Damage limited to single cell.
  • Neighboring cells continue functioning.
  • Steel casing withstands over 1000°C
Heat Propagation Safety Test
  • Overcharged cells activate CID successfully.
  • No fire or explosion observed.
  • Module maintains normal operating voltage.
Thermal Runaway Realiance Test
  • CID triggers during controlled overheating.
  • Produces only 6.9L gas volume. Less gas than competing brands.

Why Choose Greenwill?

  • Proven Marine Expertise:
  • Deemed in marine projects globally (UK, EUROPEAN, Asia,Autralia,).
  • Global Suport:
  • Remote monitoring and diagnostics via Starlink.
  • Performance: Max 110A charge (1C), Up to 330A discharge (3.0C).
  • 10.8GWh annual cell production with fully automated, eco-efficient lines.

Engineered for the Sea,Trusted by Innovators.

Contact Us:

Greenwill · Guangzhou, China

Email: info@greenwill.com Web: www.greenwill.com