Cummins Onan Generators

Macfarlane Generators is an authorised Cummins Onan installer and service agent for RVs, caravans, food and coffee vans, and mobile vehicles. Browse new and pre-owned Onan generators below, or shop Cummins Onan parts. Not sure which unit suits your vehicle? Call 1300 MAC GEN and talk to someone who installs them.

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Cummins Onan generators for mobile and vehicle power

Onan generators are built to run inside a vehicle: in an under-floor or side compartment, often off the vehicle's own fuel. That makes them a common choice for motorhomes, food and coffee vans, mobile clinics and other vehicles that need power on the move.

We supply, install and service them, with click and collect from our branches in Melbourne, Sydney, Brisbane and Perth, and delivery Australia-wide.

Replacing an Older Onan? Meet MacGen USR.

Our own range of enclosed generators, built on Honda and Kubota engines for RVs, vans and vehicles. Send us your current model and we'll match the right MacGen USR, then supply, install and service it.

Match My Generator

What we do for Onan owners

  • Supply: new Cummins Onan generator kits and pre-owned Onan sets, petrol and diesel.
  • Installation: fitting into RVs, vans and vehicles as an authorised Onan installer.
  • Servicing and repairs: as an authorised Cummins Onan service agent.
  • Parts: filters, service parts and spares from our Cummins Onan parts range.

Where Onan generators are used

Choosing the right Onan generator

Start with what you need to run: air conditioning, coffee machines, fridges or medical equipment all draw different loads. Then check the space you have, your fuel (petrol or diesel), and how quietly the unit needs to run. Our power calculator gives you a starting figure, or send us your current model and vehicle details and we'll recommend a unit.

Looking for an alternative?

Replacing an older enclosed generator? MacGen USR is our own range, built on Honda and Kubota engines for enclosed and vehicle installs. Send us your current generator model and we'll tell you which MacGen USR fits.

Cummins Onan or Cummins industrial?

Cummins Onan covers compact generators for vehicles, RVs and marine. For standby and prime power for sites and buildings, see our Cummins industrial generators. We've worked with Cummins for over 40 years.

Cummins Onan Generators FAQ

Frequently asked questions about Cummins Onan Generators

Yes. We're an authorised Cummins Onan installer and service agent for food and coffee vans, caravans, RVs and mobile applications.

Yes. We stock filters, service parts and spares for Onan generators. Browse Cummins Onan parts or call us with your model number.

Yes. Tell us your vehicle, the compartment size and what you need to power, and we'll quote supply and installation.

Yes. As an authorised Cummins Onan service agent, we service and repair Onan generators in RVs, vans and mobile applications. Book a service.

New Onan generators carry the Cummins manufacturer's warranty, and we support it. Pre-owned units carry no warranty unless one is stated in writing at the point of sale.

Yes. MacGen USR is our own range for enclosed and vehicle installs, built on Honda and Kubota engines.

Yes.

Australia’s trusted generator supplier

75+ Years Experience

Australia's longest-running generator specialists. We've powered businesses and homes since 1949.

Australian Owned

100% Australian owned and operated. Your purchase supports local workers and the national economy.

Ready-to-Use Delivery

Every generator is pre-tested and set up so you can start using it the moment it arrives.

Trusted by Thousands

Join thousands of satisfied customers across Australia who rely on our generators daily.

How to find what power generator you need

The Macfarlane Generators Power Calculator helps you estimate the generator size required for your application by calculating power demand, motor starting loads, and electrical conversions such as kVA, kW, amps, and horsepower. Designed for homeowners, tradies, and industrial operators, it provides practical tools and power consumption guides to help you select the right generator with confidence. Whether you're planning backup power, construction site equipment, or large-scale operations, the calculator simplifies generator sizing and power planning.

Power Calculator Questions? Call us on 1300 622 436