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Thornycroft Marine Generators
Marine Generators Depot supplies Thornycroft Marine Generators for yachts, cruising boats, workboats and commercial vessels requiring dependable auxiliary AC power. Thornycroft has a long-established British marine-engineering heritage, and its current generating sets are assembled in the UK specifically for marine use. The range provides practical marine diesel generator solutions for owners who value straightforward mechanical design, serviceability and proven marine cooling arrangements.
The current Thornycroft generator lineup centers on the TRGS and TRGT series, covering approximately 10kVA, 20kVA, 25kVA, 30kVA and 40kVA marine gensets. Published continuous ratings range from 9.5kVA on the TRGS-10 to 40kVA on the TRGS-40, with naturally aspirated and turbocharged engine configurations depending on output. This makes the range suitable for mid-size yacht power requirements as well as more demanding professional marine applications.
Although buyers commonly search for 10kW, 20kW, 30kW and 40kW marine generators, Thornycroft officially publishes these models in kVA. The actual kW available depends on the electrical configuration and applicable power factor, so generator selection should be based on the manufacturer’s rated output rather than assuming that kVA and kW are identical. For boats and yachts, the correct genset should also account for air conditioning, refrigeration, battery chargers, pumps, galley loads and other onboard consumers.
A notable feature of the Thornycroft range is its marine-specific cooling and exhaust arrangement. Generating sets are developed for saltwater operation with indirect heat-exchanger cooling and wet exhaust systems as standard, while dry-manifold exhaust configurations are available for specialized installations. These features make Thornycroft relevant for both recreational yacht generators and commercial marine installations where reliable cooling is fundamental to long-term operation.
Thornycroft offers both single-phase and three-phase marine generators, together with remote-control panels as standard and optional PTO arrangements. Current generating sets operate at 1500 RPM, a configuration commonly associated with 50Hz marine applications. Buyers should always confirm voltage, phase, frequency and continuous power requirements before selecting a generator, particularly when replacing an existing marine genset or supplying machinery with significant motor-starting loads.
For a replacement marine generator, Marine Generators Depot can help compare an existing genset against available Thornycroft models using output, electrical configuration, dimensions, cooling arrangement, exhaust system and available installation space. Thornycroft also maintains genuine spares and service parts for current and older products, which can be valuable for vessel owners considering long-term maintenance and support when choosing a new generator.
Whether you are considering a 10kVA Thornycroft boat generator, a 20kVA or 25kVA yacht genset, or a 30kVA–40kVA commercial marine generator, Marine Generators Depot can assist with new generator sourcing, repower comparisons, technical configuration, parts enquiries and worldwide supply for recreational and professional vessels.











