Keeping a camping fridge running for a night or two is fairly easy. Keeping it running for days at a time when you’re camping off-grid takes a little more planning.
If you’re still deciding which fridge to take camping, have a look at our Best Camping Fridge for 4WD Touring in Australia guide first. Once you’ve got an idea of the fridge you’ll be running, you can start working out how much power you’ll need to keep it going.
You need enough battery capacity to run the fridge when the vehicle is switched off, but you also need a way to replace the power you’re using. Depending on how you camp, that could be as simple as a portable power station and solar blanket, or a permanent dual-battery system charged from your 4WD and solar.
The good news is you don’t need to build an enormous 12V setup just to keep the fridge cold.
The right setup really comes down to three things: how much power your fridge uses, how much battery capacity you need, and how you’re going to recharge it.
In this guide, we’ll work through each of those, look at the different ways you can power a camping fridge off-grid, and help you work out which setup makes the most sense for the way you camp.
How Much Power Does a Camping Fridge Actually Use?
Before choosing a battery, solar panel or power station, it helps to have a rough idea of how much power your fridge is going to use each day.
A 12V camping fridge doesn’t run continuously. The compressor cycles on and off to maintain the temperature inside the fridge, so even though the specifications might say it draws 4 or 5 amps while running, that doesn’t mean it’s using 4 or 5 amps every hour.
How often the compressor runs depends on things like the outside temperature, the temperature you’ve set the fridge to, how often you’re opening it and whether you’re using part of the fridge as a freezer.
Even where you keep the fridge can make a difference. A fridge sitting in the shade with plenty of ventilation around the compressor is going to have a much easier time than one sitting in the back of a hot 4WD in the middle of summer.
That’s why it’s better to think about how much power your fridge uses over 24 hours, rather than focusing only on the maximum amp draw printed on the specifications.
As a rough example, if your fridge uses 30Ah over 24 hours, that’s 30Ah you’ll eventually need to put back into your battery if you want to keep camping indefinitely.
If you’re not sure how to work that out, we’ve covered it in more detail in our How Much Battery Do You Need for a Camping Fridge? guide, including how to estimate your fridge’s daily consumption and calculate the battery capacity you’ll need.
Once you’ve got a reasonable idea of your daily power use, the next question is where that power is going to come from.
Ways to Power a Camping Fridge Off-Grid
Once the vehicle is switched off and you’re set up at camp, you need somewhere other than your starter battery to draw power from.
There are a few different ways to do this, and you don’t necessarily need a permanent dual-battery setup. The best option depends largely on how often you camp, how long you stay off-grid and whether you want something permanently installed in your vehicle.
Portable Power Station
A portable power station is probably the simplest option if you want something you can buy, charge at home and take camping without permanently modifying your vehicle.
Everything is contained in one unit: the battery, charging system and outlets for connecting your fridge and other devices. Most modern power stations can also be recharged from solar or your vehicle while you’re away.
For weekend camping and people who only head away occasionally, that simplicity is a big advantage. You can also take the power station out of the vehicle and use it around camp or at home when you’re not travelling.
The main consideration is making sure you buy one with enough battery capacity for your fridge and anything else you plan to run.
We’ve looked at some of the options available locally in our Best Portable Power Station for Camping in Australia guide.
Portable Battery and Battery Box
Another option is a separate 12V battery, usually lithium these days, fitted into a portable battery box.
A good battery box gives you somewhere to connect the fridge along with common outlets such as USB, 12V sockets and Anderson plugs, while still allowing you to remove the whole setup from the vehicle when you need to.
It takes a little more planning than buying an all-in-one power station, particularly when it comes to charging the battery, but it can be a flexible way to build a portable system around your own requirements.
Dual-Battery System
If you’re regularly travelling or camping off-grid, a permanent dual-battery system starts to make more sense.
Instead of carrying a separate power source, an auxiliary battery is installed in the vehicle and kept separate from the starter battery. The auxiliary battery powers your fridge and other camping gear while leaving the starter battery to do its main job—starting the vehicle.
A DC-DC charger can recharge the auxiliary battery while you’re driving, and solar can be added to keep charging it once you’ve stopped at camp.
It’s a more involved and usually more expensive setup than a portable system, but for regular 4WD touring it means your camping power system is always there and ready to go.
If you’re weighing up the two approaches, we’ve covered the differences in more detail in Portable Power Station vs Dual Battery System.
What About the Starter Battery?
You can power a fridge from your vehicle while you’re driving, but I wouldn’t rely on the starter battery once you’ve stopped for any length of time.
A camping fridge can continue drawing power long after the engine is switched off, and flattening the battery that needs to start your vehicle isn’t a particularly good way to finish a camping trip.
That’s the main reason all of the options above use a separate battery source. You can keep the fridge running without worrying about whether the vehicle will start when it’s time to head home.
So now we’ve got somewhere to store the power. The next question is how much battery capacity do you actually need?
What Size Battery Do You Need for a Camping Fridge?
Once you know roughly how much power your fridge uses each day, working out the battery size becomes much easier.
Let’s use the same example from earlier and assume your fridge uses around 30Ah over 24 hours.
On paper, a 100Ah lithium battery could provide a little over three days of fridge power without being recharged. In the real world, though, you’ll probably be using the battery for more than just the fridge.
You might be charging phones, running camp lights or powering other 12V gear. Hot weather can also make the fridge work harder, and it’s always sensible to leave yourself some spare capacity rather than planning to completely flatten the battery.
This is also where the length of your trip starts to matter.
For an overnight trip, you may only need enough stored power to get you through until you drive home. For a weekend away, a suitable battery or power station might cover the entire trip without needing much charging at all.
But once you’re staying off-grid for several days, simply carrying a bigger battery isn’t necessarily the best answer.
At some point, you need to start replacing the power you’re using.
That’s why battery capacity is only one half of the equation. A 100Ah battery that can be recharged each day may be far more useful than a 200Ah battery with no way of putting power back into it.
If you want to work through the numbers for your own fridge, our How Much Battery Do You Need for a Camping Fridge? guide goes into battery sizing, amp-hours and expected runtime in more detail.
For longer trips, though, this brings us to the other half of an off-grid setup: charging the battery while you’re away.
Can Solar Keep a Camping Fridge Running?
Yes, and for longer trips solar is one of the easiest ways to extend how long you can stay off-grid.
The important thing to understand is that the solar panel isn’t really there to run the fridge directly. Its main job is to replace the power the fridge and your other gear have taken from the battery.
During the day, your solar panel or blanket charges the battery while the battery continues supplying power to the fridge. When the sun goes down, the fridge simply keeps running from the energy stored in the battery.
Ideally, you want to generate enough solar power during the day to replace most or all of what you’ve used over the previous 24 hours.
Using our earlier example, if the fridge uses around 30Ah per day, your goal is to put roughly that amount back into the battery each day, plus whatever you’ve used for lights, phones and other equipment.
How much solar you’ll need depends on the size of the system, weather, time of year and how much usable sunlight you get. A panel rated at 200W won’t produce 200W continuously from sunrise to sunset, so it’s worth allowing some breathing room when sizing your setup.
For many camping setups, you’ll see solar panels and blankets around the 150W to 250W range, but there isn’t one perfect size for every fridge. Your actual daily power consumption is still the best place to start.
Fixed Solar Panel or Solar Blanket?
If you regularly tour, a fixed solar panel can be a great option because it’s always mounted and ready to charge whenever there’s sunlight.
A portable solar blanket gives you more flexibility. You can leave the vehicle parked in the shade and move the blanket into the sun, then reposition it during the day if needed.
The trade-off is convenience. Fixed solar requires virtually no setup once it’s installed, while a blanket needs to be unpacked, positioned and packed away each time you use it.
Neither option is automatically better. It really comes down to how you travel and whether you value the convenience of permanent solar or the flexibility of being able to move it around camp.
If you’re considering a portable setup, we’ve also looked at solar blankets and portable power stations and how the two work together for off-grid camping.
Once you can replace roughly as much power as you’re using each day, your battery stops being just a countdown until the fridge turns off. You’ve got a system that can potentially keep running for as long as you’ve got enough sunlight to keep it charged.
Example Camping Fridge Power Setups
We’ve covered a few different options, but sometimes it’s easier to see how everything fits together with a few real-world examples.
These aren’t exact prescriptions for what you should buy. Your fridge, weather conditions and other electrical gear will change the numbers, but they give you a good starting point for thinking about your own setup.
Overnight or Weekend Camping
If you’re only heading away for a night or two, you can keep things pretty simple.
Pre-cool the fridge at home, leave with a fully charged battery or portable power station and make sure you’ve got enough capacity to comfortably cover the trip.
For shorter trips, you may not need solar at all.
A portable power station can work particularly well here because there’s very little setup involved. Plug the fridge in, use the power you’ve brought with you and recharge everything when you get home.
If you camp regularly on weekends, adding a portable solar panel or blanket gives you another option and means you’re not completely reliant on the power you left home with.
Three to Five Days at Camp
Once you’re staying in the same place for several days, charging becomes much more important.
You could simply carry enough battery capacity to last the whole trip, but at some point that becomes expensive, heavy and unnecessary.
A better approach is usually to have enough battery capacity to comfortably get through the night and periods of poor weather, then use solar during the day to replace the power you’ve used.
This is where a lithium battery or suitably sized portable power station paired with solar starts to make a lot of sense.
Instead of asking whether your battery can last five days, you’re trying to create a setup that can replace roughly as much power as you use each day.
Regular 4WD Touring
If you’re regularly moving between campsites, your vehicle can become part of the charging system.
A typical touring setup might use a dedicated auxiliary battery to run the fridge, a DC-DC charger to recharge the battery while you’re driving and solar to keep it topped up when you’re stopped.
That gives you two ways to put power back into the system.
Drive during the day and the vehicle helps recharge the battery. Stay at camp and solar takes over.
For someone regularly travelling around Australia, that’s a very different use case from someone heading away for a couple of weekends each year, which is why it makes sense to choose the power system around how you actually camp, rather than simply buying the biggest battery or power station you can afford.
If you’re still deciding between a portable setup and something permanently installed in the vehicle, our Portable Power Station vs Dual Battery System guide goes into the pros and cons of both.
How to Reduce Your Camping Fridge’s Power Use
So far we’ve focused mostly on storing and replacing the power your fridge uses, but there’s another side to the equation: reducing how much power you need in the first place.
A few simple changes can make a noticeable difference, particularly when you’re camping in hot weather or staying off-grid for several days.
Pre-cool the fridge before you leave home. If possible, plug the fridge into mains power the night before your trip and load it with food and drinks that are already cold. That way your camping battery isn’t doing all the work of bringing everything down to temperature.
Keep the fridge out of direct sunlight. The hotter the fridge gets, the harder the compressor has to work to maintain the temperature inside. Parking in the shade or positioning the fridge somewhere protected from the afternoon sun can help reduce its workload.
Give it some ventilation. Your fridge needs to get rid of the heat produced by the refrigeration system. Avoid packing camping gear tightly around the vents or compressor area where it can restrict airflow.
Try not to constantly open it. Every time you open the lid, warm air gets in and the fridge has to cool everything back down again. You don’t need to guard it with your life, but opening it every five minutes isn’t going to help your battery.
Don’t make it colder than it needs to be. There’s no benefit in running the fridge close to freezing if you’re only trying to keep food and drinks cold. If you’re using a fridge/freezer combination, remember the freezer compartment will also increase the amount of power the unit needs.
None of these changes will suddenly double your battery life, but together they can reduce how hard the fridge has to work.
And when you’re camping off-grid, every bit of power you don’t use is power you don’t have to put back into the battery.
What’s the Best Way to Power a Camping Fridge Off-Grid?
There isn’t one setup that’s going to suit every camper.
If you’re heading away for the occasional weekend and want to keep things simple, a portable power station may be all you need. Add some portable solar and you’ve got a setup that can keep the fridge running for longer trips without making any permanent changes to your vehicle.
If you prefer something more flexible, a lithium battery and battery box lets you build a portable 12V system around the gear you actually use.
And if you’re regularly touring in your 4WD, a permanent dual-battery system with DC-DC charging and solar starts to make a lot more sense.
Whichever way you go, the basic process is the same.
Work out how much power you’re using. Make sure you’ve got enough battery capacity to store it. Then work out how you’re going to replace that power while you’re away.
You don’t need the biggest battery, the biggest solar panel or the most expensive setup.
You just need a system that suits the way you camp.
Once you’ve got those three things reasonably well matched, keeping the fridge cold off-grid becomes the easy part.
Frequently Asked Questions
Can I Run a Camping Fridge From My Car Battery?
You can run a 12V camping fridge from your vehicle while you’re driving, but relying on the starter battery while you’re camped isn’t a great idea. If the fridge drains the battery too far, you may not have enough power left to start the vehicle. For off-grid camping, a separate auxiliary battery or portable power source is a much safer option.
How Long Will a 100Ah Battery Run a Camping Fridge?
It depends on how much power your fridge actually uses. If your fridge uses around 30Ah over 24 hours, a 100Ah lithium battery could theoretically provide a little over three days of fridge-only power without being recharged.
Real-world runtime will vary with temperature, fridge settings, other electrical loads and how much usable capacity you have available.
For a more detailed breakdown, see our guide to how long a 100Ah battery will run a camping fridge, including lithium vs AGM runtimes, real-world examples and the effect of adding solar.
What Size Solar Panel Do I Need to Run a Camping Fridge?
There’s no single solar panel size that suits every camping fridge. You need to consider how much power the fridge and your other equipment use each day, then choose enough solar capacity to replace that energy during the available sunlight hours.
For many camping setups you’ll see panels and blankets in the 150W to 250W range, but your actual daily power consumption is a better starting point than choosing a panel based on a general rule.
Can a Portable Power Station Run a 12V Camping Fridge?
Yes. A suitable portable power station can run a 12V compressor fridge and is one of the simplest ways to build a portable camping power setup.
The main things to check are the power station’s usable battery capacity, its 12V DC output and how quickly you can recharge it from your vehicle or solar while you’re away.
Can Solar Run a Camping Fridge Overnight?
Not by itself. Solar produces power during daylight hours, so overnight your fridge will normally run from the energy stored in your battery or portable power station.
The solar system then recharges the battery during the day, ready for the next night.
Is a Power Station or Dual-Battery System Better for a Camping Fridge?
Neither is automatically better.
A portable power station is simple, portable and doesn’t require a permanent installation, which can make it ideal for occasional camping and shorter trips.
A dual-battery system is permanently installed and can be charged while you’re driving, making it particularly useful for regular 4WD touring.
We’ve compared both options in more detail in our Portable Power Station vs Dual Battery System guide.