Lehmann Marine has introduced AQUBE, a new water-cooled modular LFP battery system engineered for maritime electrification. AQUBE delivers continuous 2C charge and discharge rates through the integration of the proven CUBE modular design with liquid cooling technology adapted from the company’s COBRA system. This enables the system to support high-power load profiles over sustained periods, reducing port turnaround times and supporting both fully electric and hybrid vessel operations.

The system employs lithium iron phosphate (LFP) cell chemistry, which provides intrinsic thermal stability. In the event of thermal runaway, only inert gas is vented rather than ignited. This property offers a safety advantage over traditional nickel manganese cobalt (NMC) batteries and supports compliance with DNV and ESTRIN safety requirements, which are critical for both passenger and working vessels in the maritime sector.

AQUBE’s modular units can be configured in series strings up to 1000 VDC. Each module features an integrated battery management system, pre-charge functionality, and is designed for direct connection to a ship’s cooling circuit. This maximizes operational reliability and allows for straightforward integration into vessel power and control infrastructures.

A key operational benefit of AQUBE is its service-oriented design. The compact modular architecture permits the replacement or maintenance of individual modules without needing to disconnect entire battery strings. This reduces downtime for operators and increases system accessibility, particularly important for vessels where space and time constraints are significant considerations.

Following the merger with Sunlight Group, Lehmann Marine’s annual production capacity has expanded to 300 MWh. The merger has also enabled global service support for AQUBE installations via a network of over 200 field engineers. The AQUBE battery system is targeted towards high-power propulsion and auxiliary systems in ferries, container feeders, and offshore support vessels, offering a scalable and class-compliant solution for the shipping industry’s decarbonization objectives.

First customer deliveries are planned for mid-2026, marking a significant step in Lehmann Marine’s efforts to provide safe, efficient, and high-performance energy storage solutions for a rapidly evolving maritime market.

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