AVR Generators

An automatic voltage regulator (AVR) keeps your generator's output voltage steady as the load changes, protecting the equipment you run. We stock replacement AVRs for alternators from Stamford, Leroy Somer, Mecc Alte, Sincro, Kipor, Marelli, Markon, Cromtech and Maxwatt. Send us your alternator's make, model and serial number and our parts team will confirm the right one.

AVR Generators
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What an AVR does

The AVR monitors the alternator's output voltage and adjusts the excitation to hold it at the set level, whatever the load. A healthy AVR means stable voltage for motors, tools and electronics.

Signs an AVR may need replacing

Voltage that's too high, too low or fluctuating, lights that flicker or surge as the load changes, or no output voltage at all can all point to an AVR fault. Other faults can show the same symptoms, so have a qualified technician test the generator before replacing parts.

AVRs by alternator brand

AVRs are specific to the alternator brand and model.

Our guide, An easy guide to AVRs, explains more.

Fitting and testing

Our service team diagnoses voltage faults, fits the replacement AVR and tests the generator under load. See Parts Support or call 1300 622 436.

AVR Generators FAQ

Frequently asked questions about AVR Generators

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.

Call us or send a quote request with your generator's make, model and serial number, and our parts team will confirm the correct part before you order.

Yes. Our service team diagnoses, services and repairs the generators and alternators we sell, and we supply the spare parts.

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.

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

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

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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