DY Duckyang has moved forward with a 10 MWh-class marine ESS business. The company has completed demonstration and certification of a 1.02 MWh-class water-cooled ESS and, building on this, is targeting supply of marine ESS at roughly 10 times that scale, at the 10 MWh class. While the battery system itself is similar between land-based and marine ESS, differing environmental constraints — installation space, vibration, and salt exposure — fundamentally diverge the cooling method and certification process design. This article organizes what completing the demonstration stage means from a system-design standpoint, and the nonlinear difficulty-escalation factors typically seen across a 10x scale-up. 1. Why marine applications require water cooling The…