Wattlab’s standardized 400 kWh battery pack can be retrofitted to inland vessels in one day

Dutch maritime technology firm Wattlab has introduced WEstack, a standardised battery system designed to be retrofitted onto inland vessels within a single working day. This rapid installation contrasts sharply with traditional custom-engineered battery solutions, which often require weeks to fit. The fully assembled and tested system is delivered ready to connect, simplifying the upgrade process for a variety of vessels including dry cargo ships, tankers, and small coastal craft. WEstack is installed on the aft deck and is suitable for both new builds and retrofits, offering four capacity options ranging from 100 kWh to 400 kWh. The system addresses the inefficiency of diesel generators commonly used in inland shipping, which typically operate at just 10–15% of their rated capacity. By enabling the generator to run at optimal load points to charge the battery before shutting down, the system can reduce generator operating hours by up to 90%, leading to significant fuel savings and lower maintenance demands. Wattlab has already deployed this technology on over 30 vessels worldwide, signalling growing acceptance within the sector. Bo Salet, CEO of Wattlab, emphasised the importance of energy efficiency as the most immediate and cost-effective means to cut emissions in maritime transport, particularly given the limited availability and high cost of alternative fuels. The standardised design and streamlined installation process aim to overcome key barriers to battery adoption in inland shipping. The introduction of WEstack could mark a pivotal step in accelerating the electrification of inland vessels, improving operational efficiency while reducing environmental impact. As the maritime industry seeks to meet stricter emissions regulations, solutions like Wattlab’s standardised battery packs may become increasingly vital. Further adoption and potential scaling of this technology could help shape the future of sustainable inland waterway transport.