Marine battery Svenner

51.2 Vlithiumion

Overview
Silent Sailing Svenner is a DNV Type Approved marine battery platform by EPTechnologies based on solid-state cell technology, designed for safe, long-life and scalable marine energy systems such as hybrid propulsion, hotel loads and onboard energy storage.

Key safety and platform features

• Withstands overcharge, extreme heat and punctures without thermal runaway.
• Hardware override switch and module-level protection with a dedicated fuse per module.
• Dual-core lockstep CPU BMS for redundancy and continuous monitoring; includes HVIL interlock and module-level internal water-leak detection.
• DNV Design Option 1: no propagation and no module gas ducting required; any fire is contained within the module.
• Remote data monitoring for system visibility to reduce downtime and optimise performance.
• Rack or self-stackable enclosure design for flexible installation and straightforward expansion.
• Scalable architecture: 51.2 V modular platform, up to 15 modules per string, expandable via parallel strings and multiple pack controllers.
• Estimated lifecycle cost advantage driven by long cycle life and material efficiency.

Performance and lifetime notes
Like all batteries, EPTechnologies batteries age through cycling and calendar ageing. Calendar ageing is approximately 1% per year when stored below 30 °C at 50–60% SOC. Cyclical ageing depends on depth of discharge and charge/discharge regimes; follow recommended operational guidance to maximise service life.

Recommended operational guidance

• Do not discharge below 5% SOC; maintain above 10% SOC where possible.
• Do not charge above 95% SOC for normal operation.
• Recommended average ambient temperature 25 °C; absolute maximum 50 °C.
• Normal maximum continuous discharge: typically up to 1C. Normal maximum charge up to 0.5C for extended cycle life (0.5C charge ~8,000 cycles with ~75% remaining capacity).

Tables (electrical, charge, discharge, environmental and mechanical details)
Electrical Characteristics
Chemistry: Lithium-ion (solid-state technology cells)
Nominal Voltage: 51.2 V
Energy: 16.1 kWh
Cycle Life: 10,000 @ 80% DoD
Configuration: 16 in series, 24 in parallel

Standard Charge
Max Continuous Charge: 220 A / 0.8C
Max Charge: 314 A / 1C

Standard Discharge
Max Continuous Discharge: 314 A / 1C
Peak Discharge: 350 A (15 min)

Environmental
Temperature Range: -10 °C to 60 °C
Ideal Working Temperature: 5 °C to 45 °C

Mechanical
Battery Case: ALU
Dimensions (L×W×H) mm: 810 x 425 x 250 mm
System Mount: Self-Stackable or Rack
Weight: 111 kg
Communication mode: CANbus 250k
IP Rating: IP55 (IP67 on request)
Certifications: CE, UN 38.3, DNV (DNV Type Approval NR TAE000054)
General Warranty: 2 years (3 years option)
Cycle life Warranty: 5 years

Cycle life vs Depth of Discharge (DoD)
50% DoD → 15,000 cycles
60% DoD → 13,000 cycles
70% DoD → 12,000 cycles
80% DoD → 10,000 cycles
90% DoD → 9,000 cycles
100% DoD → 8,000 cycles

Additional system architecture details

• Each string can include 1 to 15 batteries in series for nominal operation; strings can reach up to 900 V if required.
• Each string includes a string controller providing manual and remote disconnect switches and pre-charge.
• Pack Control Unit (PCU) features dual communication lines; optional slave PCU available for redundancy.
• Up to 16 strings in parallel per pack controller for large installations.

Technical specifications

• Brand: EPTechnologies
• Model: Svenner
• Chemistry: Lithium-ion (solid-state technology cells)
• Nominal voltage: 51.2 V
• Energy: 16.1 kWh
• Cycle life: 10,000 cycles @ 80% DoD (examples up to 15,000 cycles @ 50% DoD)
• Max continuous charge: 220 A / 0.8C
• Max charge (short): 314 A / 1C
• Max continuous discharge: 314 A / 1C
• Peak discharge: 350 A for 15 min
• Operating temperature range: -10 °C to 60 °C; ideal 5 °C to 45 °C
• Battery case: Aluminum
• Dimensions: 810 x 425 x 250 mm
• Weight: 111 kg
• Communication: CANbus 250k
• IP rating: IP55 (IP67 on request)
• Certifications: CE, UN 38.3, DNV (DNV Type Approval NR TAE000054)
• Warranty: General 2 years (3 years option); Cycle life warranty 5 years