A portable generator provides power where there isn't any, at a campsite, on a work site or during a blackout. Choosing the right one means matching its output to what you want to run and using it safely. This generator buying guide compares inverter and open frame generators and explains how to size one.
Inverter vs open frame generators
| Type | Pros | Cons | Best for |
|---|---|---|---|
| Inverter generator | Quieter, lighter, cleaner power, fuel-efficient at low load | Higher upfront cost per watt | Camping, caravans, electronics |
| Open frame generator | More power for the money | Louder, heavier | Work sites, tools, backup power |
Inverter generators
Inverter generators produce stable "pure sine wave" power that suits sensitive electronics like laptops, phones and TVs. Many adjust engine speed to the load, which saves fuel and reduces noise. Many campers prefer them for their quieter running.
Open frame generators
Open frame generators have an exposed frame and engine. They offer more power for the price, which suits running power tools or larger appliances, but they're louder.
How much power do you need?
Generators are rated in watts.
- Running (rated) watts: The power the generator can supply continuously.
- Starting (peak) watts: Short bursts for appliances with motors that draw extra power when starting, like fridges, air conditioners and power tools.
How to work it out
- List what you want to run at the same time.
- Find each item's wattage on its label or manual.
- Add up running watts.
- Add the highest extra starting load.
- Leave some headroom.
| Example use | Typical items | Typical generator size |
|---|---|---|
| Phones, lights and laptops | Small electronics | Around 1 to 2 kW |
| Camping with a fridge | Portable fridge, lights, chargers | Around 2 kW |
| Caravan with air conditioning | Caravan air conditioner and other loads | Around 3 to 3.5 kW or more |
| Home backup essentials | Fridge, lights, internet, chargers | Around 3 to 5 kW |
| Power tools on site | Saws, compressors | Around 3 to 6 kW |
These are rough ranges, so check your actual appliance ratings.
Fuel and runtime
- Fuel tank size and efficiency set how long it runs. Runtime is usually quoted at a partial load, so expect less at full load.
- Eco mode on inverter generators saves fuel at low loads.
- Storage: Store fuel in approved containers in a ventilated area away from the house, and follow the manual for long-term storage.
Noise
Noise is measured in decibels (dB), and the quoted figure depends on load and distance. Many campgrounds have rules on generator use and hours, so check before you go.
Features to consider
- Parallel capability to link two units for more power.
- Electric or remote start.
- Fuel gauge and low-oil shutdown.
- USB outlets.
- Wheels and handles for heavier units.
- Overload protection.
Generators to compare
Our generators range includes ONEX, Champion and Gentrax inverter and open frame generators. Our extension cords include Arlec, HPM and Jackson leads and reels. For camping gear, browse our camping and hiking and camping tools and lights ranges. Every brand we stock is listed on our brands page.
Safety first
Carbon monoxide
Generators produce carbon monoxide, a poisonous gas you can't see or smell.
- Only run a generator outdoors in a well-ventilated area.
- Never run it inside a home, garage, shed, tent, caravan or annexe, even with doors open.
- Keep it away from windows, doors and vents.
Electrical safety
- Never connect a generator directly to your home's wiring or power point (back-feeding). This can be deadly for you and electrical workers.
- To power your home, have a licensed electrician install a proper changeover switch and inlet.
- Use heavy-duty, outdoor-rated extension leads of a suitable length and rating.
- Keep the generator dry and don't touch it with wet hands.
Fire safety
- Turn it off and let it cool before refuelling.
- Keep fuel away from the running generator.
- Keep a fire extinguisher nearby.
For more tips, see our extension lead safety guide.
Preparing for blackouts
If you want a generator for storms or outages:
- Decide which essentials you need to run, such as the fridge, a few lights, internet and phone chargers.
- Test-run the generator outdoors every few months so it starts when you need it.
- Keep enough fresh fuel stored safely, and rotate it as the manual recommends.
- Keep leads, a torch and the manual together in one spot.
- Talk to a licensed electrician about a changeover switch if you want to power household circuits.
Generators for camping
For a camping trip:
- Choose a quiet inverter generator.
- Check campground rules.
- Keep it away from tents and other campers.
- Bring a suitable lead.
See our camping checklist. For charging phones and small devices, a power bank or portable power station may be enough. Read our power bank buying guide.
Maintenance
- Change the oil as the manual recommends.
- Clean or replace the air filter.
- Run the generator regularly to keep it in working order.
- Follow the storage instructions in the manual.
Related guides: Camping Checklist Australia, Extension Leads and Powerboards, Power Bank Buying Guide.
Frequently asked questions
What size generator do I need?
Add up the running watts of everything you'll use at once, add the highest starting load, and leave some headroom. Small camping setups often need around 2 kW.
Is an inverter generator safe for electronics?
Inverter generators produce stable power that suits laptops, phones and TVs. Check the specifications for pure sine wave output.
Can I plug a generator into my house?
Not directly. A licensed electrician needs to install a changeover switch and inlet so it can be connected safely.
Can I run a generator in my garage or tent?
No. Generators produce carbon monoxide, so only run them outdoors, away from windows, doors and vents.
