Wattlab
Wattlab develops custom solar energy systems. With roots originating from the Vattenvall Solar Team, Wattlab builds upon their own expertise by bringing solar energy and technology to the shipping industry.
By applying thin and lightweight solar panels in the marine industry, Wattlab aims to contribute to a solution for the climate problem. The solar hatches’ energy can be used to power the onboard applications that are otherwise powered by a generator. On hybrid ships, the generated solar energy supports propulsion. The elimination of genset and fuel use results in less pollution and noise for the environment. As the usage of a generator is no longer allowed in some ports, it is required to connect to shore power, which is not always facilitated well. The use of solar hatches allows the captain more freedom as the vessel is not reliant on a fixed location with shore power.
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This case study explores a 100 kWp solar PV system installed on the hatch covers of a handymax bulk carrier. Operating primarily in Northern Europe, the system offsets auxiliary engine load during idle periods, leading to estimated savings of ~$350,000 between 2025 and 2035. With a CAPEX of $100,000, the payback period is around three years. Most savings come from fuel reduction, with additional benefits from EU ETS and FuelEU compliance. The business case is most sensitive to engine efficiency (SFC) and fuel price.