The Challenge
A coastal cargo vessel lives in two different electrical worlds. Under way and during cargo operations, the deck crane, hatch equipment, hydraulics, and hotel load demand full generating capacity. At anchor or alongside — which can be a large share of the vessel's calendar — demand falls to a fraction of that. Running one large genset around the clock means burning fuel at poor part-load efficiency for thousands of hours a year, and piling those hours onto a single engine. The operator wanted a configuration matched to how the ship actually spends its time, certified by China Classification Society, and supplied as a complete engine-room package.
Our Solution
We paired two Weichai marine gensets sized to the vessel's two operating states: a 200kW main unit on the WP10 platform carrying seagoing and cargo-handling loads, and a 120kW harbor unit on the WP6 platform carrying anchorage and port loads on its own. Both are heat-exchanger cooled with direct seawater circuits, supplied as open-frame engine-room units with class-approved local control panels. The split cuts fuel burn during every low-load hour and spreads running hours across two engines instead of wearing out one.
Load-matched main/harbor pairing — the 120kW unit alone carries anchorage and port loads, cutting fuel consumption and saving the main unit's running hours for when they earn revenue.
Both units CCS-certified with class-approved control panels, delivered as a complete documented package for survey.
Engine-mounted heat exchangers with direct seawater cooling and marine anti-corrosion build — engineered for the engine room of a working coastal vessel, with service parts available in any Chinese port.
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The Result
Both units were surveyed, commissioned, and put into service on schedule. Across the vessel's first operating year, the harbor unit has carried the ship's full at-anchor and in-port load on its own — hours that would previously have run a larger engine at poor efficiency — while the main unit has supported every cargo operation without interruption. The operator's superintendent now specifies the same two-tier pairing when refitting other vessels in the fleet.