Why the 4500W
Our most powerful generator.
Impressive power for its size, with 4000W of running power, a generous 12L fuel tank and a compact 40kg design. Built for caravanning, home backup and the job site.
4000WRunning power
Big power
Run the aircon and more.
On a hot night, the aircon is only the start. With 4000W of continuous running power and two AC outlets, the Promac 4500W gives you the flexibility to power selected caravan air conditioners while keeping everyday essentials like the fridge, lights and coffee machine running.
10 hrsFrom, on a 12 L tank
Home backup
Ready for the next blackout.
When a storm knocks the power out, you want something that keeps going. With a 12L fuel tank delivering 10+ hours of runtime and two AC outlets, the Promac 4500W can keep essentials like your fridge, freezer, lights, fans and phone chargers running when you need them most.
Made for
Made for bigger jobs.
Big vans
Power for the big van
Run your caravan aircon with other appliances at the same time - No problem!
Home backup
Keep the house going
Run several essentials in a blackout: fridge, freezer, lights and phones.
Job sites
Power for the tools
Two AC outlets run power tools and chargers on clean, stable power.
Promac 4500W vs Others
Feature
Promac 4500W
Others
Power-to-weight
100W per kg — impressive power for its size
Often heavier for similar or less power.
Run time
From 10 hrs on a 12 L tank
Runtime varies by tank size and load
Noise
From 53 dB(A). Quiet for its size
Often be louder under load
Moving it
Wheel & handle kit included
Wheels and handles not always included
Start
Electric start, battery included
Ease of starting varies by model
Warranty
3-year engine warranty, local parts
Varies by brand
"Others" means a typical open-frame generator. Features vary by brand.
40 kgOn wheels
Easy to move
Big power that rolls.
Built for power and practicality, the Promac 4500W features a convenient wheel and handle kit that makes moving its 40kg frame easy to manage. Simply lift the handle, tilt it onto its wheels and roll it wherever you need power, whether that's beside the caravan, around the shed or on the job site.
E-StartPush Button.Power On.
Simple Operation
Easy Electric Start.
Forget the hassle of pull-starting. The Promac 4500W features electric push-button starting, making it quick and easy to get your generator up and running. Just follow a few simple steps, press the start button and you're ready to power up.
Good to know
Questions people ask
Will it run my caravan air conditioner?
Yes! It will run caravan air conditioners, with 4000W of running power. That leaves room to run other appliances at the same time, like the fridge or the microwave.
How long does it run on a tank?
With a generous 12L fuel tank, it delivers 10+ hours of runtime - and you can expect even longer on lighter loads. Our 10-hour figure is deliberately conservative, with the fuel-saving inverter technology helping extend runtime when power demand is lower.
Is it easy to move?
Absolutely! At 40kg, the included wheel and handle kit makes moving it around easy. For lifting into a ute or trailer, we recommend two people.
Is it easy to start?
Absolutely! With electric push-button starting, getting up and running is simple. Just add oil and fuel, connect the included battery and follow the easy steps in your Quickstart Guide. You're ready to go!
Can I use it to power my home in a blackout?
Yes! You can keep several household essentials running, including your fridge, freezer, lights and phone chargers. Use suitable heavy-duty extension leads and appropriately rated power boards to connect appliances, without exceeding the generator's capacity. Always operate the generator outdoors in a well-ventilated area, well away from doors, windows and vents. Never connect it directly to your home's wiring.
Can I connect it to my home's power through a changeover switch?
Yes! With a professionally installed generator changeover switch, you can connect your generator to your home's electrical system using a suitable lead and dedicated inlet. This allows you to power selected household circuits through your existing power points and switches during a blackout, without running extension leads throughout the house.
A licensed electrician must install the system and confirm compatibility with your generator.
Located on the Sunshine Coast? We highly recommend Blackout Protection for home backup generator installations.
Is it quiet?
It runs from 53 dB(A) at 7 metres, which is quiet for a generator this size.
What warranty do I get?
The generator comes with a 3-year warranty on the Macht engine and a 12-month warranty on all other generator components, with warranty agents and spare parts available across Australia.
Promac is Australian-owned, family-run since 1981 and proudly based in Beerwah, Queensland.
How do I look after it?
Regular maintenance is important to keep your generator running reliably. Always follow the service schedule in your manual, and keep an eye on a few simple things like avoiding old or stale fuel, checking your oil levels and avoiding extended periods of running with very little load.
We also stock a Generator Service Kit and 1L engine oil to make regular servicing easy.
Can I see one in a store?
Yes. Use the store locator to find a Promac stockist near you or give us a call anytime we can help guide you in the right direction! Phone: 1800 773 267 or email promac@promac.com.au
Compare the range
Which Promac generator is right for you?
The Camping Companion
2000W Inverter Generator
$995.00
Best for lightweight, portable power
View the 2000WHeading off for a weekend? This light, easy-to-carry unit runs portable fridges, LED lights and device charging, with 1,800W running power at 18.5 kg.
- Most popular
The All-Rounder
3300W Inverter Generator
$1,395.00
Best for caravanning and everyday power
View the 3300WA great all-rounder for caravanning, home backup and light trade jobs. Easily powers caravan appliances and coffee machines, with 3,000W running power and convenient push-button start.
- You're viewing
The Powerhouse
4500W Inverter Generator
$1,945.00
Best for bigger power demands
You're viewing this oneIdeal for caravanning, home backup, rural properties and demanding worksites. With 4,000W running power, a generous 12L fuel tank and included handle and wheels, it delivers serious power without the bulk. Electric Start!
Compare full specs
| Specification | 2000W | 3300WMost popular | 4500W |
|---|---|---|---|
| Running (rated) outputRun power | 1,800W | 3,000W | 4,000W |
| Starting outputStart power | 2,000W | 3,300W | 4,500W |
| WeightWeight | 18.5 kg | 23 kg | 40 kg |
| Size (L × W × H, mm)Size (mm) | 480 × 285 × 460 | 500 × 305 × 500 | 595 × 440 × 515 |
| Wheel & handle kitWheel kit | No | No | Yes |
| Noise at 7 mNoise | From 52 dB(A) | From 54 dB(A) | From 53 dB(A) |
| Fuel tankFuel tank | 4 L | 7 L | 12 L |
| Run timeRun time | 6 hrs at 50% load | From 6 hrs | From 10 hrs |
| Start systemStart type | Recoil | Electric + recoil | Electric & recoil |
| AC power outletsAC outlets | 1 | 1 | 2 |
| USB & 12V outletsUSB/12V | Dual USB + 12V | Dual USB + 12V | Dual USB + 12V |
| Digital displayDisplay | Yes | Yes | Yes |
| Macht engine warrantyWarranty | 3 years | 3 years | 3 years |
