Products / SubCtech / Li-ion Energy Storage Systems

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Ocean & Marine Monitoring Systems, AUV & ROV Subsea Batteries

SubCtech / Li-ion Energy Storage Systems

Li-ion Energy Storage Systems

Long-Life, API17F-Certified Subsea Energy Storage System for High-Demand Offshore Backup Power

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Li-ion Energy Storage Systems

Developed for high-demand energy scenarios exceeding 1 MWh, ESS are designed to serve as a primary or contingency power source for offshore infrastructure, particularly where grid connection is not feasible or intermittent. The architecture supports integration with renewable sources, providing a stable energy buffer for oil and gas production systems, subsea sensor networks, and remote autonomous assets.

Each system incorporates fully API17F-qualified lithium-ion battery modules and is certified to UN T38.3 standards, ensuring compliance with rigorous safety and transportation requirements. The accompanying subsea skids are meticulously engineered and qualified for pressure, temperature, and corrosion resilience, guaranteeing long-term survivability under harsh marine conditions.

Products include:

  • Battery Storage Skid (BSS) – The Battery Storage Skid (BSS) is a ruggedized energy storage system engineered for demanding subsea and offshore applications, delivering stable and reliable power under extreme marine conditions.
  • Converter Skid (Power Skid PS) – The Power Skid (PS) is the interface between the user’s subsea system and the Energy Storage System (ESS). The Power Skid connects the Battery Storage Skids BSS and provides interfaces.
  • Diagnosis & Charge Unit (DCU) – The Diagnosis & Charge Unit (DCU) is a reliable fast charging container with a charge power up to 170 kW to recharge BSSs after subsea deployment. Additionally, the DCU offers diagnostic functionality for all ESS components.

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