Powering Vessels Safely
Designed for the Future
Greenwill Power
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).
High C-rate performance
Discharge: up to 2.27C
Charge: up to 1C
Long life cycles
10,000+ cycles @80% DoD; 4,000+ cycles @100% DoD
Simplified Thermal Management
Natural air cooling by ventilation
Wide Operating Range
Charge: -10°C to 50°C; Discharge: -20°C
to 65°C (cell surface)
Cell
- Chemistry: Cylindrical LFP (LiFePO₄), 4.6Ah, 3.2V nominal.
- Safety: Individual CID fuse per cell; steel casing for impact / vibration resistance.
- Robustness: Operates at -20°C to 68°C; minimal gas release during thermal events (2.29-6.9L/cell).
- Small cells:Low energy capacity at 14.7Wh per cell, minimizing the risk of propagation.
Modules
- Config: 16S24P (51.2V, 110.4Ah, 5.65kWh).
- Design: IP67-rated steel enclosure; cylindrical cells feature enhanced surface area and spacing, facilitating efficient natural cooling.
- 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
- DNV TA Certificate
- LR Certification in process
- 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).
Warranty
-
10+ Years:
Covers defects and performance degradation (80% SoH at 10,000 cycles).
System Configuration
Greenwill Power offers battery racks in three heights-1311 mm, 1765 mm, and 2219 mm-allowing for optimal fitment in diverse battery rooms across different vessel types. The “R10” rack supports up to 10 modules, whereas the “R18” accommodates up to 18 modules. Modules are arranged in series within each string, each string featuring its own Battery Management System. These strings can be connected in parallel to form a comprehensive energy system, delivering the required energy output for various marine applications.
| System Specifications | |
|---|---|
| Rack Heights | 2219 mm (R18), 1765 mm (R14), 1311 mm (R10) |
| Rack Width & Depth | W840 mm, D500 mm |
| Cell type | LFP 4.6Ah Cylindrical |
| Single module Energy / Nominal Voltage | 5.65 kWh / 51.2V |
| Single string Max. Voltage | 1000 V |
| Max. Gravimetric Density - String | 104 Wh/kg |
| Max. Volumatic Density - String | 102 Wh/litre |
| Max. Energy Density footprint - String | 229 kWh/m² |
| Performance Specifications | |
|---|---|
| Discharge C-rate (Peak 5 min/continuous) | 2.27C / 2C (15min) |
| Charge C-rate - Continuous | 1C |
| Cycle Life (80% DoD, 1C/0.5C) | 10,000 |
| Example System 1 | MS001-17-10 |
|---|---|
| System Configuration | 10 strings each comprising of R18 racks with 1x BAU |
| Energy | 961 kWh |
| Voltage (Min/Nom/Max) | 789 / 870 / 979 V |
| Dimensions & Weight (H x W x D / Mass) | 2219 x 8400 x 500 mm / 10497 kg |
| Energy Density | 91.5 Wh/kg | 103 Wh/litre |
| Example System 2 | MS001-13-10 |
|---|---|
| System Configuration | 10 strings each comprising of R14 racks with 1x BAU |
| Energy | 735 kWh |
| Voltage (Min/Nom/Max) | 603 / 666 / 749 V |
| Dimensions & Weight (H x W x D / Mass) | 1765 x 8400 x 500 mm / 8123 kg |
| Energy Density | 90.5 Wh/kg | 99.1 Wh/litre |
| Example System 3 | MS001-09-10 |
|---|---|
| System Configuration | 10 strings each comprising of R10 racks with 1x BAU |
| Energy | 509 kWh |
| Voltage (Min/Nom/Max) | 418 / 461 / 518 V |
| Dimensions & Weight (H x W x D / Mass) | 1311 x 8400 x 500 mm / 5749 kg |
| Energy Density | 88.5 Wh/kg | 92.4 Wh/litre |
| Safety Specifications | |
|---|---|
| Thermal Runaway Anti-Propagation | Intrinsic cell level thermal runaway isolation with small LFP cylindrical cell |
| Disconnect Circuit | String level with HV breakdown |
| Short Circuit Protection | CID in each cell and fuse in battery string level |
| Emergency Stop Circuit | Hard-wired |
| Disconnect Switchgear rating | Full load |
| Off-gas duct | Not necessary |
| General Specifications | |
|---|---|
| Communication Protocol | CAN or Modbus |
| Class Compliance | DNV, LR (LR certification ongoing) |
| Ingress Protection | Module: IP67 | System: IP54 |
| Cooling | Natural air-cooling | Ventilation |
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.