New Cummins Onan Marine QD 21.5MDKDR-8112A Generator for Sale

The Cummins Onan Marine QD 21.5MDKDR-8112A Generator is a premium 21.5kW marine diesel generator engineered to deliver dependable auxiliary onboard power for luxury motor yachts, bluewater cruising yachts, catamarans, sportfishing boats, expedition vessels, passenger ferries, commercial fishing vessels, and offshore workboats. Designed for continuous-duty operation, this marine genset combines exceptional fuel efficiency, remarkably quiet performance, and proven durability, making it an ideal solution for vessels that require reliable electrical power during extended voyages.

Built within the internationally recognised Cummins Onan Quiet Diesel (QD) Series, this onboard generator supplies clean, stable AC electrical power for today’s advanced marine electrical systems. Whether you’re replacing an ageing boat generator, upgrading your vessel’s auxiliary power system, or specifying a dependable marine power generator for a new build, the QD 21.5MDKDR-8112A delivers the engineering excellence and worldwide support that have made Cummins Onan one of the world’s most trusted marine generator manufacturers. Powered by the proven Kubota V2403 diesel engine, it incorporates advanced electronic controls and precision voltage regulation for dependable onboard electrical performance.

If you’re researching the Cummins Onan Marine QD 21.5MDKDR-8112A price or searching for the Cummins Onan Marine QD 21.5MDKDR-8112A for sale, this model is an excellent choice for anyone looking to buy a Cummins Onan marine generator that delivers dependable performance, low operating costs, and long-term ownership value.

Built on the Cummins Onan Quiet Diesel (QD) Series

The Cummins Onan Marine QD 21.5MDKDR-8112A belongs to the advanced Quiet Diesel (QD) Series, a family of premium marine auxiliary generators engineered specifically for demanding recreational and commercial marine applications.

Powered by a dependable 4-cylinder, 4-stroke, water-cooled Kubota V2403 marine diesel engine, this vessel generator incorporates freshwater cooling through a heat exchanger, a brushless four-pole alternator, advanced electronic governing, solid-state voltage regulation, and premium acoustic insulation. These technologies work together to deliver stable voltage, precise frequency control, reduced harmonic distortion, excellent fuel economy, and exceptionally quiet performance while minimising vibration. The generator also supports SAE J1939 CAN communication and optional Cummins Onan Digital Display, allowing operators to monitor engine and alternator performance with advanced onboard diagnostics.

Backed by more than 90 years of marine power innovation, the Quiet Diesel Series continues to be recognised as one of the industry’s leading quiet marine generators, trusted by yacht builders, marine engineers, commercial operators, and vessel owners worldwide.

Why Choose the Cummins Onan Marine QD 21.5MDKDR-8112A?

Choosing the right marine diesel generator means investing in dependable onboard electrical power that performs every time you leave the dock.

The QD 21.5MDKDR-8112A offers:

• Reliable 21.5kW continuous-duty electrical output
• Proven Quiet Diesel technology
• Fuel-efficient Kubota V2403 marine diesel engine
• Exceptionally quiet operation with reduced vibration
• Brushless Onan alternator with precision voltage regulation
• Freshwater cooling with heat exchanger
• Stable power for sensitive marine electronics
• Advanced electronic diagnostics and self-monitoring
• Compact installation footprint
• Worldwide Cummins dealer and technical support

Its dependable engineering makes it one of the best marine generators for owners seeking reliable marine energy solutions during offshore cruising, extended voyages, and demanding commercial operations.

Applications

This yacht generator is engineered to provide dependable auxiliary electrical generation across a wide range of marine applications.

Recommended applications include:

• Luxury motor yachts
• Cruising yachts
• Sailing yachts
• Bluewater catamarans
• Sportfishing boats
• Expedition yachts
• Trawlers
• Liveaboard vessels
• Passenger ferries
• Commercial fishing boats
• Offshore support vessels
• Professional marine workboats

Whether supplying power for navigation electronics, communication systems, refrigeration, battery charging equipment, watermakers, air-conditioning systems, galley appliances, or hotel loads, this marine auxiliary generator delivers dependable electrical performance while maintaining excellent fuel economy and exceptionally quiet operation.

Technical Specifications

Genuine Warranty Coverage

Every new Cummins Onan Marine QD 21.5MDKDR-8112A Generator is supplied with genuine Cummins manufacturer warranty protection against defects in materials and workmanship when installed, commissioned, and maintained according to Cummins’ published recommendations.

Routine servicing using genuine Cummins Onan replacement parts, approved lubricants, and scheduled preventive maintenance helps preserve warranty eligibility while maximising operational reliability, fuel efficiency, and service life. Cummins’ express limited marine warranty covers virtually all non-routine components during the first two years, with major powertrain and generator components receiving extended coverage through years three to five, subject to the manufacturer’s warranty terms.

Built for Long-Term Marine Reliability

A marine diesel generator is one of the most important systems aboard any vessel, making reliability essential when selecting the right onboard power solution. The Cummins Onan Marine QD 21.5MDKDR-8112A combines advanced Quiet Diesel technology, dependable electrical generation, efficient fuel consumption, and proven marine engineering to deliver years of reliable service.

If you’re comparing Cummins Onan marine generators for sale, this model stands out through its stable electrical output, exceptionally quiet performance, worldwide service support, and low lifetime operating costs. Owners researching the Cummins Onan Marine QD 21.5MDKDR-8112A price consistently recognise its outstanding long-term value, making it an excellent investment for both recreational and commercial marine applications.

Frequently Asked Questions

Is the Cummins Onan Marine QD 21.5MDKDR-8112A suitable for offshore cruising?

Yes. Its continuous-duty design, dependable Kubota diesel engine, and stable electrical output make it ideal for offshore cruising, long-distance passages, and liveaboard vessels.

Can this generator replace an older Cummins Onan marine generator?

In many cases, yes. Compatibility depends on your vessel’s engine-room dimensions, mounting arrangement, electrical configuration, and onboard power requirements.

Is this generator suitable for commercial marine applications?

Absolutely. It is widely used aboard commercial fishing vessels, passenger ferries, offshore support vessels, and professional marine workboats requiring dependable auxiliary electrical generation.

How often should this generator be serviced?

Routine maintenance should follow Cummins’ recommended service schedule, including oil and filter changes, cooling system inspections, belt checks, impeller inspections, and scheduled load testing.

Are genuine Cummins Onan replacement parts available worldwide?

Yes. Genuine replacement parts and factory-authorised technical support are available through Cummins’ extensive worldwide dealer network.

Request a Quote

The Cummins Onan Marine QD 21.5MDKDR-8112A Generator is engineered to deliver dependable onboard electrical power, exceptionally quiet operation, and long-term reliability for demanding marine environments.

Whether you’re replacing an existing boat generator, upgrading your vessel’s auxiliary electrical system, or specifying a premium marine genset for a new installation, contact us today to request a personalised quotation, confirm availability, discuss worldwide shipping, or receive expert guidance in selecting the right Cummins Onan marine generator for your vessel.