Space constraints on ships have traditionally limited options for compact battery storage systems. The new Kaptein Series power storage system addresses this by allowing battery modules to be installed individually throughout the vessel—even on the floor. Its advanced technology delivers the highest energy density, lowest weight, and fastest charging speeds currently available. This facilitates the integration of clean e-drives in shipping, improving both feasibility and cost-efficiency.
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Tesvolt Maritime Solutions has provided battery storage systems since 2018, focusing primarily on workboats, deep-sea vessels, and aquaculture, as well as pleasure craft and the yachting sector. To date, Tesvolt Maritime Solutions has equipped 160 ships with environmentally friendly battery propulsion systems, including the award-winning “E-Spatz,” operated by the German Federal Waterways and Shipping Administration. Ocean Batteries, established in 2019, specialises in modular, safe, and high-performance battery solutions. Tesvolt holds a 51% share in the joint venture Tesvolt Ocean. The company unveiled its new “Kaptein” battery storage system at SMM, the world’s leading maritime trade fair in Hamburg.
Long range and fast charging
“We’re entering the market with a best-in-class storage system, offering a technological solution for the biggest challenges faced by ship owners, system integrators and shipyards,” explained Kent Thoresen, CTO of Tesvolt Ocean. “The limited range of ships with electric propulsion remains a key issue for many owners. Space on vessels is often tight, restricting the number of battery modules that can be installed to reach the desired range. Our new Kaptein system, with an energy density of 246 Wh per litre, currently leads the market, delivering high capacity while occupying minimal space.”
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Most batteries approved for marine use do not support a continuous C-rate of 2 C. The “Kaptein” storage system offers a continuous C-rate of 4 C, making it the highest currently available in the maritime industry. This enables substantially shorter charging times for ship owners.
Light, safe and installable
The new storage system is also notably lightweight. At just 4.83 kg per kWh of storage capacity, it will be the lightest battery system available for marine use, compared to existing options weighing at least 7 kg per kWh. A unique fire suppression system further guarantees maximum safety.
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“We spent three years engaging deeply with customers across six focus groups to understand their needs. That’s why Kaptein is so well suited to address real challenges in ship e-propulsion,” added Kilian Hoffmann, CCO at Tesvolt Ocean. “We’ve already received a substantial number of inquiries about the new battery system.”
Support from the outset
“Every customer has different goals. That's why we always tailor our battery system precisely to the individual customer. Kaptein is not an off-the-shelf product. But due to its special cell-to-module design, it’s exceptionally cost-efficient compared to the rest of the market,” said Øystein Kjæreng, CEO of Tesvolt Ocean. “We’re a one-stop shop, offering planning, installation, and commissioning as well as monitoring, maintenance and recycling. We want to make a significant contribution with this new product toward accelerating the equipping of shipping with clean e-drives as simply and cost-effectively as possible.” (hcn)
