Purchasing your first portable generator can feel overwhelming. Walk into any hardware store or browse online retailers, and you'll encounter a bewildering array of options—different wattages, fuel types, inverter versus conventional, and price tags ranging from a few hundred to several thousand dollars. How do you know which one is right for your needs?
This comprehensive guide is designed specifically for Australian buyers who are new to generators. We'll cut through the technical jargon, explain what actually matters, and help you make an informed decision that you won't regret. Whether you need backup power for blackouts, a reliable companion for camping trips, or job site power for your tools, understanding the fundamentals will ensure you get exactly what you need.
Understanding Generator Basics: Watts Explained
The most important specification to understand is wattage—the measure of electrical power a generator can produce. Generators are rated with two wattage figures:
- Peak (Starting) Watts: The maximum power the generator can produce briefly to start motors and appliances with high startup demands.
- Continuous (Running) Watts: The sustained power output the generator can maintain during normal operation.
When sizing a generator, always base your decision on continuous watts, with peak watts providing headroom for startup surges. For example, a generator rated at 3000W peak / 2400W continuous can run appliances totalling 2400W indefinitely, with capacity to handle brief startup spikes.
📊 Common Appliance Wattages
Here are typical power requirements for common Australian appliances:
- LED lights: 10-20W each
- Phone charger: 10-20W
- Laptop: 50-100W
- Refrigerator: 100-400W running, 1000-1500W starting
- Microwave: 600-1500W
- Air conditioner (portable): 1000-2000W
- Electric kettle: 1800-2400W
- Power drill: 300-800W
- Circular saw: 1200-1800W
Inverter vs Conventional Generators
This is perhaps the most important decision you'll make, and understanding the difference will prevent costly mistakes.
Conventional Generators
Traditional generators, also called open-frame or AVR generators, produce electricity through a simple alternator. They're characterised by:
- Lower purchase price for equivalent wattage
- Louder operation (typically 70-80+ decibels)
- "Dirty" power with slight voltage fluctuations
- Constant engine speed regardless of load
- Better suited for heavy-duty applications
Conventional generators are excellent for powering tools on job sites, running pumps during floods, or providing high-wattage backup power where noise isn't a concern. However, the power fluctuations can potentially damage sensitive electronics.
Inverter Generators
Inverter generators use advanced electronics to produce clean, stable power. Their advantages include:
- Pure sine wave output safe for all electronics
- Significantly quieter operation (50-65 decibels)
- Fuel efficiency through variable engine speed
- Lighter and more portable
- Higher cost per watt
For camping, caravanning, and home backup power, inverter generators are typically the better choice. You can safely charge laptops, phones, and run modern refrigerators without worrying about damage.
💡 The Golden Rule
If you'll be powering any sensitive electronics (phones, laptops, modern fridges, TVs), choose an inverter generator. If you only need to run tools and simple appliances, a conventional generator offers better value.
Fuel Types: Petrol, Diesel, or Dual-Fuel
Petrol Generators
The most common choice for portable generators in Australia. Petrol is readily available, and petrol engines are generally lighter and quieter than diesel alternatives. The main drawback is fuel storage—petrol degrades over time and becomes unusable after 3-6 months without stabiliser treatment.
Diesel Generators
Less common in portable sizes, diesel generators offer greater fuel efficiency and longer engine life. Diesel stores better than petrol and is often cheaper. However, diesel engines are heavier, noisier, and more expensive upfront. They're most suitable for larger generators used frequently or for extended periods.
Dual-Fuel Generators
Some generators can run on both petrol and LPG (gas). This flexibility is valuable for emergency preparedness—when petrol stations lose power during blackouts, LPG bottles may still be available. LPG also stores indefinitely without degradation.
Key Features to Consider
Electric Start vs Pull Start
Electric start generators use a battery and key or button to start, similar to a car. This is more convenient, especially in cold weather or for users who find pull-starting difficult. Pull-start generators are simpler and lighter, with no battery to maintain. Many generators offer both options.
Fuel Tank Size and Runtime
Consider how long you'll run the generator between refuelling. A 10-litre tank might provide 8-10 hours at 50% load for an efficient inverter generator. For overnight camping or extended power outages, longer runtime reduces inconvenience.
Outlet Types and Quantity
Ensure the generator has appropriate outlets for your needs:
- Standard 10A outlets for most appliances
- 15A outlets for larger loads and power tools
- USB ports for direct device charging (convenient for camping)
- 12V DC outlet for charging batteries
- 30A RV outlet if powering a caravan (check compatibility)
Portability
If you'll be transporting the generator frequently, weight and handling features matter significantly. Look for integrated handles, wheels on larger units, and overall dimensions that fit your vehicle. Many compact inverter generators weigh under 25kg and can be lifted by one person.
✅ Australian Conditions Tip
In hot Australian summers, generators work harder to stay cool. Choose a generator with good ventilation design, and always operate in shaded areas when possible. Never run a generator in enclosed spaces due to carbon monoxide danger.
Sizing Your Generator: A Practical Approach
Follow these steps to determine the right size:
- List all appliances you want to run simultaneously
- Find running watts for each (check nameplates or manuals)
- Identify the highest starting wattage among motor-driven appliances
- Total running watts plus highest starting watts equals your minimum requirement
- Add 20% headroom for safety and efficiency
For most camping and light backup use, a 2000W inverter generator handles essentials comfortably. For running a caravan air conditioner or multiple power tools, step up to 3000-4000W. Whole-house backup typically requires 5000W or more.
Budget Considerations
Expect to pay $400-800 for a basic 1000W inverter generator suitable for camping essentials. Quality 2000W inverters from reputable brands range from $800-1500. Conventional generators offer more watts per dollar—a 3000W open-frame unit might cost $600-1000.
Remember that the cheapest option often proves expensive in the long run through poor fuel efficiency, shorter lifespan, and limited warranty support. Australian-supported brands offer peace of mind with local service centres and parts availability.
Final Recommendations
For most first-time buyers, we recommend starting with a quality 2000W inverter generator from a reputable brand. This size handles camping needs, provides meaningful backup power for essentials, and remains portable enough for one person to manage. As you learn your actual usage patterns, you can always add or upgrade later.
Take time to read reviews from Australian users, compare warranty terms, and consider where you'll source parts and service. A generator is a significant investment that should serve you reliably for many years.