Cummins Inc. has extended its portfolio of Onan marine generator sets with the introduction of the MDC (Marine Diesel Cummins) Turbo and Onan QSB7E ranges.

Details of the two generator sets were shared at the Marine Equipment Trade Show (METS), a premium European showcase for professionals in the leisure marine industry.

The arrival of the MDC Turbo and Onan QSB7E means boatbuilders and owners can now deal with a single trusted brand – Cummins – for the entire power requirement of their vessel. Cummins is the parent brand of Onan and of Stamford, the leading name in alternators for marine applications.

The electrical power spread of the Cummins marine Onan range now stretches from 4 kWe to 195 kWe. Previously, the highest Cummins Onan rating available was 65 kWe.

Cummins generator sets are renowned for their robust build quality and outstanding performance characteristics, notably in the area of low noise, vibration and harshness (NVH).

The two new ranges, which can run on 100% hydrotreated vegetable oil (HVO 100), build on that proud heritage of reliable, smooth and efficient power delivery.

The versatility of the MDC and Onan QSB7E is enhanced by the ability to synchronise the generator sets, yielding benefits such as improved stability of electrical supply, greater fuel efficiency and higher levels of comfort all round for passengers and crew.

Cédric Merveillaud, Cummins Director of Marine Europe, said: “With the one supplier for propulsion and auxiliary power, life becomes a lot simpler and more productive for boat builders and owners. Cummins can handle the entire power demand.”

The MDC genset complies with EPA Tier 3 and EU Stage V regulations and is available for both commercial and recreational marine applications as a 50 Hz or 60 Hz model.

It can also be specified as either non-aftercooled or aftercooled. This provides two power outputs, giving the genset a rating of 40 to 80 kWe and 80 to 110 kWe respectively.

Using the Cummins Onan Digital Display, the MDC provides user-friendly diagnostics including extensive engine and alternator information, ensuring customer ease on the water.

At the top end of the Cummins Onan genset scale now sits the Onan QSB7E, a perfect low noise power solution for a variety of maritime applications including high-end superyachts, small passenger ferries, fishing boats and offshore support vessels.

Available as unclassed, class-ready and full-class, the Onan QSB7E has 10 power nodes and can be specified with an open or enclosed unit in both 50 and 60 Hz models. Maximum output is up to 195 kWe.

Like the MDC, the Onan QSB7E can be supplied with the additional option of a front mounted power take-off which can be used to power various auxiliary systems, for example, hydraulic pumps, giving the customer flexibility and redundancy onboard.

For ease of maintenance and maximum use of space, the MDC and Onan QSB7E have single-side service access and the water-cooled exhaust can be installed either in forward or rear-facing configuration. At the base of both generators are multiple outlets for fuel and battery cables.

“Cummins marine genset products are designed and built to provide reliability, performance and durability at reduced noise and vibration levels,” said Merveillaud. “That’s why this complete marine generator set package is ideal for recreational and light commercial vessels.

“The 99kW commercial genset node is very popular in certain markets, and we expect the B4.5 genset package with a Cummins Stamford alternator will be an obvious choice when selecting power for operators for years to come.”

The MDC and Onan QSB7E gensets are backed by Cummins’ extensive warranty (five years / 2,000 hours), and users have access to a worldwide service network of more than 10,000 authorised dealer locations, the largest such network in the world.

Cummins B4.5 packs propulsion punch

The light but power-dense B4.5 is compliant with IMO II, EU Stage V and RCD 2 regulations without the use of aftertreatment. It offers a power range of 102-250 hp in propulsion format (76-186 kW) and 76-129 kWm in auxiliary format.

Thanks to its optimised turbos, the B4.5 has best-in-class peak torque, which not only provides greater acceleration but makes it easier to maintain speed, even for vessels with high loads such as dredgers and fishing boats.

The high-pressure common rail fuel system of the B4.5 delivers class-leading fuel consumption while its cast water-cooled exhaust manifold makes for lower surface temperatures and improved overall performance.

The air intake system includes commercial and recreational reusable washable air cleaners for more cost savings.

The electrical system is offered in both 12 and 24 volts with simple electrical OEM interface connections that can be integrated with Cummins’ C Command Systems. A remote backup throttle option is also available for easier integration for vessels that require it.

The electronic system includes automated push button start/stop controls easily integrated through the ECM. It also features engine protection and derate reducing the risk of catastrophic failure.

The B4.5 is available with a base warranty of 24 months or 1,000 hours for high output and light duty applications; 24 months or 3,000 hours for intermittent duty applications; or 24 months or unlimited hours for continuous duty and prime power applications.

The B4.5 is offered with either dry or wet exhaust elbows which allows for easier integration with any vessels that need to be repowered.

Cummins QSB 6.7 for smooth and responsive performance

The compact design and flexible installation options make the Cummins QSB 6.7 ideal for a wide range of boat applications.

Its outstanding performance is courtesy of a perfectly matched turbocharger and new 24-valve cylinder head that delivers industry-leading power density.

The QSB 6.7 is also amazingly quiet, emitting 80 per cent less noise at idle, helped by the new Walker air filter and the same smoothly efficient high pressure common rail fuel system as featured on the B4.5.

The QSB6.7 is compliant with IMO II, EU Stage V and RCD 2. In recreational marine propulsion mode, power ranges from 230-550 hp (172-410 kW) and from 98-210 kWm in auxiliary mode. It delivers incredible torque of 720-1250 lbft (976-1695 Nm) for maximum enjoyment at the helm.

Single loop, low temperature aftercooling eliminates the need for two keel coolers and lowers emissions. The tube-and-shell heat exchanger is designed for superior durability and ease of service with minimal maintenance requirements. Fan drive is available for radiator-cooled configurations

The QSB 6.7 complies with US EPA Tier 3 emissions regulations without the use of aftertreatment. It is designed to meet the International Association of Classification Societies (IACS) and SOLAS requirements. Oil service intervals can be increased to 500 hours if using ultra-low sulphur diesel (ULSD).

As with the B4.5, the QSB 6.7’s electrical system is offered in both 12 and 24 volts isolated and non-isolated versions.

The QSB 6.7’s 24v Quantum System electronics package features a proven ECM to monitor operating parameters such as fuel consumption, duty cycle, engine load and speed, while providing diagnostics, prognostics and complete engine protection. A simplified electrical customer interface box for all vessel connections removes any complexity from installation.

The QSB 6.7 is available with a base warranty of 24 months or 1,000 hours for high output and light duty applications; 24 months or 3,000 hours for intermittent duty applications; or 24 months or unlimited hours for continuous duty and prime power applications.