Diesel Generators

Diesel generators are built for long hours, heavy loads and sites that can't afford to lose power. We supply diesel gensets from compact portable units through to industrial sets over 1,000kVA, in single and three-phase, from brands including PowerLink, Pramac, Kubota, Cummins and Caterpillar. Use the Power Calculator to work out your size, or call 1300 622 436. We action enquiries within the hour.

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Why diesel

A diesel generator uses less fuel than a petrol unit of the same output, runs longer between services and handles continuous, heavy loads. That's why diesel is the standard for construction sites, farms, commercial standby and prime power. Petrol suits light, occasional use. Diesel pays its way when the generator works hard or often.

Portable diesel generators

Compact diesel generators give you diesel's fuel economy and long run times in a unit you can move around a site, farm or property. The range includes open-frame and silenced models, many with electric start. See the smaller sizes in Portable Generators, or filter this range by kVA.

Industrial and commercial diesel gensets

For commercial standby, prime power and project work, we supply enclosed diesel gensets in three-phase 415V and single-phase from PowerLink, Cummins, Caterpillar and Pramac. We supply industrial generator and load bank solutions up to 2,500kVA, and larger sets are custom built to order. Industrial sets are quoted to your requirements, because the enclosure, transfer switch, fuel tank, delivery and installation all change the price. Tell us about your project and we'll recommend the right set. See also Industrial Generators.

Single-phase or three-phase

Homes and small sites usually run on single-phase 240V. Three-phase 415V powers motors, pumps, workshops and commercial buildings. Your electrician can confirm what your site uses, or we can help. Three-phase sets by size:

Prime and standby ratings

Diesel gensets carry two ratings. Standby is the output for emergency backup when the mains fails. Prime is the output for running as your main power source. Each product lists both, and we'll match the set to how you'll actually run it.

Installation, service and support

We can supply the generator on its own or deliver a turnkey job: generator, automatic transfer switch, installation, commissioning and testing. Our service team includes certified electricians and technicians trained in generator maintenance and critical power systems. We've supplied diesel generators to aged care facilities, water boards, rural councils and mine sites, with after-hours support set up around each client's needs.

Used diesel generators

Every pre-owned unit is tested and inspected. See Used and Second-Hand Generators.

Why buy from Macfarlane Generators

We've supplied and serviced generators since 1949, with branches in Melbourne, Sydney, Brisbane and Perth. We keep diesel generators in stock, so urgent jobs don't wait on long lead times. Buy online and collect free from any branch, or have it delivered Australia-wide.

Diesel Generators FAQ

Frequently asked questions about Diesel Generators

Standby sets only run during a mains outage and are sized for that occasional load. Prime sets are designed to run as the primary power source for extended periods, a site with no mains connection at all, or one that runs off-grid deliberately. Tell us which one you need; it changes both the spec and the duty cycle rating we size to.

Most industrial and commercial sites run three phase. Single phase suits smaller loads - offices, small workshops, some retail. If you're not sure, send us your switchboard details or existing supply and we'll confirm.

Diesel suits long run times, heavy or continuous loads and business backup. It uses less fuel for the same output and lasts longer between services. Petrol costs less upfront and suits light, occasional use.

Both. We can deliver only, or have our licensed electricians connect, load-test and commission the set on site, the same service we run for our hire fleet.

Send us your load list and tell us whether it's prime or standby duty and single or three phase. We'll size it. For a starting figure before you call, use the Power Calculator.

Industrial sets are quoted to your requirements. The enclosure, transfer switch, fuel tank, delivery and installation all change the price. Send a quote request or call 1300 622 436. We action enquiries within the hour.

Most orders are dispatched within 1–2 business days once payment has cleared. Allow 7–10 working days for large items. Deliveries run on weekdays between 9am and 5pm, to ground level only, and someone needs to be there to sign.

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