Leisure & commercial • 7.5–100 kVA • Isuzu-powered • Built in Australia
Reliable marine power for commercial and pleasure craft.
Isuzu-powered marine generators from Vortum and Zenith Engineering – available in New Zealand through Shaw Diesels.
From the super-silenced Vortum range for leisure craft and light commercial vessels, through to the heavy-duty Zenith Isuzu gensets built to spec for commercial fishing, charter and ferry operations – we’ve got the right marine generator for your vessel.
Both ranges are built by Zenith Engineering in Australia and powered by genuine Isuzu engines. As an authorised Isuzu Power Solutions dealer, Shaw Diesels provides the local sales, installation, parts and service support to keep your generator running for years to come.
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Two ranges.
One trusted partner.
Whether you’re fitting out a luxury launch or repowering a coastal trader, we’ve got the right marine genset.
- Vortum: Super-silenced 7.5–18.5 kVA for leisure and light commercial vessels. Just 57 dB at 7m under full load, quieter than a normal conversation.
- Zenith Engineering: Commercial-grade 20–100 kVA gensets built to spec for fishing, charter, ferry and large leisure operations.
- Genuine Isuzu engines: Fully marinised or keel-cooled, with on-water service support from our specialist marine team.
- MeccAlte, Stamford or Leroy Somer alternators: AVR-controlled, with anti-condensation heaters and double-dipped marine windings.
- Built in Australia: Zenith Engineering, Brisbane workshop, manufacturing marine generators since 1945.
- NZ-supported: Sales, installation, parts and service through Shaw Diesels in Auckland and Christchurch.
Choose your range.
Two distinct ranges from the same Australian manufacturer – engineered for very different jobs.
Pick the one that fits your vessel.
Vortum
Super-silenced marine generators from 7.5 to 18.5 kVA. Built around genuine Isuzu engines and MeccAlte alternators inside a purpose-built sound-attenuated cabinet. The V18.5 produces just 57 dB at seven metres under full load – whisper-quiet for leisure and light commercial vessels.
Zenith Engineering
Heavy-duty Isuzu-powered marine gensets from 20 to 100 kVA, built to your vessel’s spec. Choice of fully marinised or keel-cooled cooling, wet or dry exhaust, electronic or mechanical control panels, and Stamford, MeccAlte or Leroy Somer alternators.
Super-silenced power for leisure & light commercial.
The Vortum range delivers serious power without the noise.
At 57 dB at seven metres under full load, the V18.5 is quieter than a typical conversation – so you’ll barely know it’s running.
That level of silence comes from 2mm powder-coated aluminium construction, 32mm acoustic foam with embedded rubber wavebar, and a directional baffle airflow design that eliminates the noise-leaking vents found on conventional marine generators.
Three models – V7.5, V13 and V18.5 – standard at 230V / 50Hz / single phase. Genuine Isuzu engines, MeccAlte alternators, DSE 4520 MKII control panel, and a fully marinised wet exhaust system as standard.
Vortum Range
Commercial-grade power, built to your spec.
The Zenith Isuzu marine genset range delivers serious power for commercial fishing, charter, ferry and large leisure operations.
Eight models from 20 to 100 kVA in single and three-phase configurations – every unit built to the specifications required by the end user.
Choose fully marinised or keel-cooled engine systems, wet or dry exhaust, electronic or mechanical control panels, and a selection of premium alternators from Stamford, MeccAlte or Leroy Somer. Load sharing systems are available for parallel operation, and every unit is load tested prior to delivery with a certificate provided.
Proven in some of the harshest marine environments on earth – from the South Pacific to the Maldives.
Now available in New Zealand through Shaw Diesels.
Zenith Engineering range
Specialist marine support, wherever your vessel is.
Shaw Diesels doesn’t just sell marine generators – we install, service and support them.
Our specialist marine team can do the job in our workshop at the Auckland marina or our Christchurch branch, or we can come to your vessel – anywhere in New Zealand or the Pacific.
Every Vortum and Zenith generator is powered by a genuine Isuzu engine, and as an authorised Isuzu Power Solutions dealer, we have the expertise and the genuine parts inventory to keep your generator running for years to come.
Contact us
Rapid response 24/7.
0800 3388 969
A marine generator that won’t start when you’re offshore is the last thing you want.
When something goes wrong – at the wharf, at anchor or underway – our team is on call to help, 24 hours a day, seven days a week, anywhere in New Zealand and the Pacific.
Call 0800 3388 969
The full marine generator range.
Three Vortum models from 7.5 to 18.5 kVA, plus seven Zenith models from 20 to 100 kVA.
All Isuzu-powered, all built in Australia by Zenith Engineering.
