Choosing the best generator for a caravan is not straightforward. Wattage ratings, noise levels, fuel economy, weight and price all compete for attention, and most buying guides online do little more than reprint the same spec sheets.
We took a different approach. The Outbax team tested five Gentrax inverter generators under real caravan conditions, measuring actual noise output at seven metres, timing fuel consumption under load and running common appliances to see which units deliver and which fall short.
This guide covers everything you need to make a confident decision: how we tested, what we found, how to size a generator for your setup and what the noise rules are at Australian caravan parks. Whether you are powering a basic weekend tourer or running air conditioning on a long-haul trip through the outback, there is a model here that fits.
Why an Inverter Generator Is the Best Choice for Caravan Use
Clean Power Output: What Pure Sine Wave Means for Your Caravan Appliances
A pure sine wave generator produces electricity that mirrors the smooth waveform from your household mains. That matters for caravans because modern appliances, from inverter air conditioners to CPAP machines, phone chargers and LED televisions, rely on stable, clean power. Feed them the choppy output of a cheap conventional generator, and you risk overheating, erratic performance or permanent damage.
Every inverter generator in this test produces a true pure sine wave at 240V, which means your sensitive electronics are as safe on the road as they are plugged in at home.
Gentrax GT3500 Inverter Generator
Noise, Weight and Fuel Efficiency Compared to Conventional Generators
Conventional open-frame generators are louder, heavier, and less fuel-efficient than their inverter counterparts. A typical 3.5kW open-frame unit sits around 75-80 dB at 7 metres. The equivalent inverter model runs between 55 and 62 dB under a similar load. That difference is enormous in a caravan park at night.
Inverter generators are also lighter. Most units in the 2 to 3.5kW range weigh under 30 kg, making them manageable for one person to load in and out of a vehicle. Fuel efficiency improves, too, because inverter technology adjusts engine speed to match the actual load rather than running flat out regardless.
Key Features to Look for in a Camping Generator
When comparing models, focus on rated (continuous) wattage rather than peak wattage. Check the noise rating at 25% load, as that reflects the level you will hear most of the time. Look for electric or remote start if ease of use matters to you, and confirm the unit has overload protection and low oil shutoff for long-term reliability.
How We Tested and Noise-Rated Each Caravan Generator
Our Testing Methodology: Real World Conditions, Not Lab Data
Each generator was set up outdoors on level ground and run through three load stages: light load (LED lights and phone charger), moderate load (compressor fridge and small fan), and heavy load (portable air conditioner cycling on and off). We recorded fuel consumption per hour at each stage and noted how quickly the unit stabilised after a sudden load change.
Testing was conducted by the Outbax product team over consecutive days under similar weather conditions to ensure comparable results.
VoltX VX3850 Pro 2-Wire Inverter Generator
How We Measured Noise Levels in Decibels
Noise measurements were taken at seven metres from the exhaust side using a calibrated sound level meter. We recorded peak and average readings at 25%, 50%, and 100% rated load. Seven metres is the approximate distance between neighbouring sites at most Australian caravan parks, so these figures reflect what your neighbours would actually hear.
Best Generators for Caravans in 2026: Our Top Picks Compared
Best Overall: Gentrax GT3500 Inverter Generator (3.5kW)
The Gentrax GT3500 earned its place at the top of this list by balancing power, noise and portability better than anything else we tested. At 3.5kW rated output, it handles a compressor fridge, microwave, lighting and device charging simultaneously. Noise averaged 62 dB at seven metres under moderate load, which is quieter than a normal conversation.
It weighs 28 kg, starts reliably on the pull cord and runs for over seven hours at 25% load on a single tank. For buyers who prefer keyless starting, the Gentrax 3.5kVA Remote Electric Start Inverter Generator offers the same core performance with push-button and remote start convenience.
Here’s what one of our customers said,
“I recently purchased a 3.5kva Gentrax generator. First thing that drew me to it was Australian made. Where I live there are 5 units owned by other people. The generator itself runs great. The price was excellent compared with other 3.5kva generators and the manual that comes with it is very informative and detailed ie, how to store it for long periods without the seals and components deteriorating.”
Best for Running a Caravan Air Conditioner: Gentrax GT6600 Inverter Generator
If you need to run a rooftop air conditioner alongside other appliances, the Gentrax GT6600 is the generator to consider. Its 5.5kVA rated output comfortably absorbs the startup surge of most caravan air conditioners and still leaves headroom for a fridge, lights and charging. It is the heaviest unit in the lineup at around 89 kg, so two people are needed to move it. Noise came in at 62 dB under heavy load, still well within caravan park limits.
Best Compact Option: Gentrax GT800 Inverter Generator
Weighing just 8.5 kg, the Gentrax GT800 is the most portable generator in the Outbax range. It is ideal for solo travellers or couples with minimal power needs: phone charging, LED lighting and a small 12V fridge. Noise was impressively low at 58 dB average under moderate load. It will not run a microwave or air conditioner, but for lightweight free camping setups, it is hard to beat in size, noise and price.
Here’s what one of our customers said:
“I have had this little fella for several years now, and its performance has been faultless. I live in FNQ and my power supply is appalling. For example, the genny has been running for about 25 hours in the last week. I kid you not. So it has done a lot of hours. I give it regular oil changes and it starts first pull every time. It is all that I need to run the essentials - lights, computer, fridge (inverter motor) , and occasionally, the washing machine. This is starting to sound like a paid ad, but it’s not. At this price, it is an absolute bargain.”
Best Value Mid-Range: Gentrax GT2500 Inverter Generator
The Gentrax GT2500 sits in the sweet spot for most caravanners who do not need air conditioning. It comfortably runs a compressor fridge, LED lights, a television and multiple device chargers. Noise came in at 62 dB at seven metres, making it one of the quietest mid-range units available in Australia. At under 28 kg, it is light enough for one person to carry and store.
Gentrax GT1200 Inverter Generator
What Size Generator Do You Need for a Caravan?
Common Caravan Appliance Wattage Requirements
Before choosing a generator, add up the wattage of every appliance you plan to run at the same time. A compressor fridge typically draws 60 to 150W running, but up to 600W on startup. LED lights use around 10 to 30W total. A phone charger draws about 10W. A microwave sits at 600 to 1,000W. A portable air conditioner can draw 1,000 to 2,000W continuously, with startup surges reaching 3,000W.
Once you have your total, add 20% headroom. This protects the generator from running at full capacity and extends its service life.
Sizing for Air Conditioning vs Basic Caravan Setups
A basic caravan setup with a fridge, lights, fans and charging will sit between 500W and 1,200W total. A 2.5kVA generator covers that with room to spare. If you are adding air conditioning, you need at least 3.5kW rated output to handle the startup surge safely. For larger rooftop units or running the air conditioner alongside a microwave, a 5.5kVA or higher generator is the right choice.
The Outbax Gentrax range spans 1kW to 6kW, so there is a model matched to every caravan power requirement.
Noise Rules at Australian Caravan Parks: What You Need to Know
Typical Decibel Limits and Quiet Hours
Most Australian caravan parks set noise limits between 65 and 70 dB measured at the site boundary. Quiet hours typically apply from 9 or 10 pm through to 7 or 8 am, and some parks ban generators entirely during these periods. A growing number of parks require inverter generators specifically and refuse entry to conventional open-frame models.
National parks and state forests that permit free camping often have less formal rules, but the expectation of keeping noise to a minimum still applies.
How Inverter Generators Help You Stay Within the Rules
All five generators in this guide measured below 63 dB at seven metres under moderate load. The quietest, the Gentrax GT800, averaged just 58 dB. Eco mode, which reduces engine speed when the load is light, drops noise even further. If you are staying in parks with strict policies, a quiet inverter generator is not optional. It is essential.
Gentrax GT800 Inverter Generator
Choosing the Right Caravan Generator Comes Down to How You Travel
The right generator depends on three things: how much power your caravan demands, how much noise your campsite tolerates and how much weight you are willing to carry. For most setups, a mid-range inverter generator between 2.5kVA and 3.5kW covers the essentials with noise to spare. If air conditioning is non negotiable, step up to 5.5kVA.
Every generator in this guide was tested under real conditions by the Outbax team, and each model is available with free shipping across Australia. Browse the full Gentrax inverter generator range at Outbax to find the right fit for your next trip.
