Wattlab Launches Solar Flatrack Technology for Bulk Shipping
Wattlab, a Netherlands-based maritime solar energy specialist, has successfully deployed its innovative Solar Flatrack solution aboard the bulk carrier Vertom Tula. This installation marks a significant step in the company’s expansion into the international bulk shipping market. The Solar Flatrack system, which utilizes unused deck space without disrupting vessel operations, features a 79 kWp installation divided into four independent solar groups. These groups connect directly to the ship’s 400V AC hotel load switchboard, providing a sustainable energy source for onboard electrical demands.
The technology is particularly well-suited for bulk cargo vessels with stackable or folding hatch covers, making it ideal for ships up to Capesize size. Bo Salet, CEO and co-founder of Wattlab, emphasized that the system’s design allows for straightforward integration into existing deck layouts and cargo operations. Currently, the Solar Flatrack is suitable for vessels up to the Supramax class, with ongoing development aimed at adapting the technology for Panamax carriers.
Performance and Operational Flexibility
Wattlab’s Solar Flatrack technology has demonstrated its effectiveness during initial trials conducted in collaboration with TNO and shipping company Vertom. The trials took place on the Vertom Anette, where valuable insights were gained that informed the design and installation of 44 Solar Flatracks on the Vertom Tula. The results showed that the solar arrays performed consistently in marine conditions, significantly reducing auxiliary fuel use and contributing to lower emissions. Notably, the system was able to reduce approximately one-fifth of the vessel’s hotel load.
A key feature of the Solar Flatrack is its ability to remain operational during cargo handling. The units can be disconnected, stacked, or stored within the footprint of a 20-foot container when necessary, allowing shipowners to maintain flexibility in deck operations. Salet noted that the primary limitation of the technology arises from the handling of cargo on larger vessels, which often involves falling cargo that can create a harsher mechanical environment. To address this challenge, Wattlab is developing solutions that ensure the durability and reliability of the Solar Flatrack under demanding conditions.
With over 200 international parties expressing interest in the Solar Flatrack technology, Wattlab aims to help operators improve their performance in emissions-related indicators, such as the Carbon Intensity Indicator (CII) and the Energy Efficiency Existing Ship Index (EEXI). The company estimates a payback period of three to five years for shipowners who adopt this technology, making it a viable option for enhancing operational efficiency while complying with EU regulations, including FuelEU Maritime and the Emissions Trading System.
A Complementary Solution for Decarbonization
Salet describes the Solar Flatrack as a practical and complementary decarbonization solution rather than a direct replacement for other methods. Its primary advantage lies in delivering immediate fuel and emissions savings through a relatively simple retrofit process. Unlike shore power, which only generates value when a vessel is docked, the Solar Flatrack provides energy savings both at sea and in port, reducing reliance on generators.
When compared to wind-assisted propulsion, the Solar Flatrack is easier to retrofit and integrate into existing operations. While wind systems can offer significant savings, they are often route-dependent and may require substantial modifications to vessel design and operations. In contrast, the modular and low-profile design of the Solar Flatrack minimizes disruption during installation, lowering barriers to adoption.
