How Many Watts Does a Fridge Use? (Australian Guide)
Your fridge almost certainly uses between 21 and 52 watts on average, around the clock. Not 150 watts, not 400. The big numbers you see quoted are what the compressor draws while it is actually running, and your compressor is off most of the time.
You do not have to take anybody's word for this. The exact figure for your fridge is already stuck to the side of it, and you can check it in about a minute.
How many watts does a fridge use?
Every fridge sold in Australia carries an Energy Rating Label, and the number in the energy consumption box is, in the government's own words, an estimate of how much electricity a model uses annually, in kilowatt hours.
That figure already accounts for the compressor cycling on and off across a whole year, which is exactly what you want. Turning it into watts takes you two steps.
- Multiply the annual kWh by 1,000 to get watt hours
- Divide by 8,760, the number of hours in a year
The test fridge here says 373 kWh a year. So 373,000 divided by 8,760 gives 42.6 watts. That is the honest average, and it is the number every other calculation on this page is built from. Run yours now and you can follow along.
Fridge watts per hour, per day and per month
Once you have the average watts, the rest falls out. These figures use the government's own worked examples plus the fridge measured for this article. Find yours in the table, or work it out on your own sticker.
| Fridge | kWh/year | Average watts | kWh/day | kWh/month |
| 6-star efficient | 187 | 21.3W | 0.51 | 15.6 |
| 3-star | 349 | 39.8W | 0.96 | 29.1 |
| Test fridge | 373 | 42.6W | 1.02 | 31.1 |
| Larger family fridge | 458 | 52.3W | 1.25 | 38.2 |
Watts per hour is a slightly odd way to put it, but people search for it, so: the average watts figure is the hourly draw. A 42.6 watt average means 42.6 watt hours every hour, 1.02 kWh a day, about 31 kWh a month.
To turn any of that into money, multiply your annual kWh by your own electricity rate. The government uses this exact example: a 458 kWh fridge at 30.7 cents a kWh costs about $140.61 a year to run.
Watts vs amps: how many amps does a fridge use?
Amps are just watts divided by voltage, and your mains supply is 230 volts. So take your average watts and divide by 230.
| Fridge | Average watts | Average amps at 230V |
| 6-star efficient | 21.3W | 0.09A |
| 3-star | 39.8W | 0.17A |
| Test fridge | 42.6W | 0.19A |
| Larger family fridge | 52.3W | 0.23A |
Those are averages, and they are why your fridge happily shares a normal power circuit. The moment the compressor starts is a different story, which is the next section.
Why the sticker beats the number on the compressor plate
There are three different wattage figures floating around for any fridge, and people mix them up constantly.
Running watts. What the compressor draws while it is actually running. Often 100 to 200 watts on a domestic fridge. This is the number most websites quote, and on its own it is misleading, because the compressor is off more than it is on.
Surge or startup watts. The spike when the compressor kicks in, commonly three to six times the running figure. It lasts a fraction of a second. It is the number that decides whether a generator or inverter can start your fridge at all.
Average watts. The sticker figure divided out. This is the one that tells you what the fridge costs and how long a battery will run it.
Use average watts for anything to do with energy and cost. Use surge watts for anything to do with whether a device can start it. Mixing them up is how people end up buying a generator twice the size they need, or a battery half the size.
What we measured versus what the sticker said
Worth knowing before you trust the sum too far. Run overnight on a monitored battery, that same fridge told a different story. The sticker predicted 42.6 watts. The real average came in at 55 watts, about 29 per cent higher.
That is not the label lying. It is a standardised test in a controlled room, and your kitchen is warmer, your door gets opened, and your fridge may be fifteen years old. So do your sticker sum, then add roughly a quarter for real life.
Here is that overnight run on video, including the app screens showing the compressor cycling on and off through the night. The measurement starts partway in if you want to skip the unboxing.
The full write-up is in the BLUETTI FridgePower review if you want to see the label figure against the meter.
Will a 200W solar panel run a fridge?
Sometimes, and only just.
Work on four peak sun hours a day and 75 per cent system efficiency once you allow for your controller, cabling and heat. A 200 watt panel then makes about 0.6 kWh a day.
| Fridge | Needs per day | 200W panel makes 0.6 kWh |
| 6-star efficient | 0.51 kWh | Covered |
| 3-star | 0.96 kWh | Short by 0.36 kWh |
| Test fridge | 1.02 kWh | Short by 0.42 kWh |
| Larger family fridge | 1.25 kWh | Short by 0.65 kWh |
So a 200 watt panel will run a very efficient fridge in good conditions and fall short on everything else. If yours is a normal family fridge you want 400 watts or more, and you want battery in between, because the fridge keeps running after dark and the panel does not.
Four hours is the winter number, not the average
Peak sun hours are not a fixed figure. They are highest in summer and lowest in winter, and they vary a long way by latitude.
Queensland runs around 6 peak sun hours in summer and about 5 in winter. South Australia sits near 5.5 in summer and 4.5 in winter. Victoria is lower again, generally between 3.5 and 4.2 across the year.
Four hours is used in the sums above deliberately, because it is roughly a winter figure for the southern states and it is the number you want when you are sizing for your worst case. If you are in Queensland in January you will do considerably better than the table suggests. If you are in Hobart in June, four hours is optimistic.
Size on the winter number. A solar setup that only works in February is not a backup plan.
Will a 2000W inverter run a refrigerator?
Comfortably, yes.
A domestic compressor running at, say, 150 watts might surge to somewhere between 450 and 900 watts on startup. A 2,000 watt inverter has room for that several times over.
The thing to check is not the wattage but the waveform. You want a pure sine wave inverter. Cheaper modified or stepped sine wave units make compressor motors run hot and noisy, and some modern fridges with electronic controls will refuse the supply outright. Anything sold as pure sine at 1,000 watts or more will run a domestic fridge without complaint.
Will a 1500W generator run a fridge?
Yes, with the same caveat and one extra.
1,500 watts covers a 150 watt compressor surging up to ten times its running draw, which is more headroom than you need. Where people come unstuck is running the fridge alongside something else. Add a kettle and you are over.
The extra caveat is that a cheap open-frame generator does not produce clean power. If you are running a modern fridge with a circuit board in it, use an inverter generator. It costs more and it is quieter, and it will not cook the electronics.
What size battery or power station do you need to run a fridge?
Now your average watts figure earns its keep. The sum is usable battery capacity, divided by your average watts plus about 15 watts of inverter overhead.
Usable capacity is roughly 95 per cent of the rating on the box, so knock five per cent off whatever you are looking at. On the test fridge at its measured 55 watts, that works out as:
| Battery size | Usable | Runtime on the test fridge |
| 864Wh | 821Wh | About 12 hours |
| 1,433Wh | 1,362Wh | About 19 hours |
| 2,016Wh | 1,915Wh | About 27 hours |
| 8,064Wh | 7,661Wh | About 109 hours |
Check the surge rating too, not just the capacity. A unit quoting a surge figure around double its continuous rating will start a fridge without drama. That 2,016Wh row is the one measured against a real run rather than a spec sheet, and it held a family fridge for about 27 hours on test.
If you would rather not do sums, the Power Station Finder asks a few questions and does it for you, or you can read what size power station you need to run a fridge for the longer version.
Four ways to cut what your fridge costs you
Check your seal. Shut the door on a sheet of paper. If it slides out with no drag, the seal has gone and the compressor is running more than it should. Replacement seals are cheap.
Give it air. If yours is jammed hard against a wall it cannot shed heat, so it runs longer. Fifty millimetres behind and above makes a measurable difference.
Turn your second fridge off. The beer fridge in the garage is often older, less efficient and half empty, and in a hot garage it works harder than the one in the kitchen. It can easily cost more to run than the main fridge.
Buy on the sticker, not the price. The government's own comparison puts a 3-star 349 kWh fridge at about $190 a year against a 6-star 187 kWh fridge at about $102, on a 54.32 cent tariff. That is the difference you are choosing between in the shop. That gap compounds over a decade of ownership.
The short version
Find your sticker. Take the annual kWh, times 1,000, divide by 8,760. That is your average watts, and it answers the cost question, the battery question and the solar question. Add about a quarter to it for real-world conditions.
Use surge watts, not average watts, when you are asking whether something can start the fridge. Those are two different questions and the same number will not answer both.
Worth reading next: how long food lasts in a fridge without power, whether a UPS will keep your fridge running, or the BLUETTI FridgePower review for what these numbers looked like on a real fridge for a full day.
Annual consumption examples are from energyrating.gov.au's published worked examples. Watts, amps, daily and monthly figures are calculated from those, and from a fridge measured directly for this article. Solar output assumes four peak sun hours and 75 per cent system efficiency; peak sun hours vary by state and season as set out above. Checked 2 September 2026.
