Considering how to power your caravan air conditioner when you don't have access to mains power? Your options are a small portable camping generator or caravan batteries... yes it is possible to run a caravan air conditioner from the right RV battery system, but there are a few things you need to know first. Find out more below:
Example: Dometic Aircommand Ibis 4
Let's use The Dometic Aircommand Ibis 4 as an example for our explanation.
Dometic Ibis 4 Review
The Dometic Aircommand Ibis 4 has an inverter controller compressor so it has a very low start up power draw. It will slowly ramp up to its peak power draw. The peak power draw is around 1600W.
Therefore, you could use a good quality 2000W inverter, such as the Enerdrive ePOWER 2000W 12V Pure Sine Wave, connected to your battery bank. However, you need to understand the reality of of an RV air conditioners (be it an inverter or a non inverter) power draw.
The formula is simple: (kWh ÷ system voltage) × 1,000 = Ah.
Say the air conditioner draws an average of 1200W per hour. In a 12V system , that is 100 Amps. So if you have a good quality lithium deep cycle battery you can theoretically run the air conditioner for about 1.5 hours before you need to recharge your batteries. That is the big factor that most people miss. You will need to recharge those batteries and it takes a while to recharge a big battery bank.
Enerdrive Ultimate Off-Grid 4x4 Bundle
If you have a 40Amp DC to DC charger it will take about 3 hours of driving to compensate for charge lost from 1 hour of running your air conditioner. If you are using 600W of solar on the roof, it will take 1 full day of solar to replace that 1 hour of air conditioner running! Now, that is not taking into account any of your other appliances.
Let's say you have a back up generator with a 60A AC to DC Charger, it will still take about 2 hours of running your generator to replace the lost charge!
So a long story short, you can do it if you are aware of how that will affect your battery storage and charge loss and knowing how to manage that system.
Real-Life Example: Trip In A Van
Justin from Trip In A Van takes us through running their Dometic Harrier Air Conditioner from a 400Ah Enerdrive Lithium Battery System - skip to 25:29 in the video below!
The Dometic Harrier Plus Rooftop Air Conditioner only drew 45-55 Amps, which means they could comfortably run the system for 3 to 4 hours per day with an input of 30 Amps of solar in full sun. In this test example, the air con was only drawing the difference of 15 Amps from the battery system.
Obviously you have to take into account all the other appliances and electronics you need to power during your off-grid camping trip. The takeaway message is the Dometic Harrier Plus Air Conditioner ran more efficiently than theoretically calculated solely from the manufacturers specifications.
This is a big win for the Dometic Inverter Air Conditioner Models.
Dometic Inverter Air Conditioner Models
Introducing the Dometic FreshJet 7 Series – a top-tier, energy-efficient caravan air conditioner range designed for today’s modern caravanner. This range offers a compact design that saves valuable rooftop space without compromising on powerful cooling performance.
What makes the FreshJet 7 Series unique? It comes equipped with Dometic's CleanAir technology, which helps filter out dust, allergens, and odours, keeping the air inside your caravan fresh and clean. Additionally, its advanced inverter compressor cools the interior up to 41% faster than previous models while using less energy, making it both efficient and effective for off-grid adventures.
Other Inverter Air Conditioner Models
Battery Choice
Battery choice is critical: Enerdrive’s B-TEC Ultra 300Ah Lithium Battery is a game-changer for off-grid caravanning. Two in parallel give 600Ah - enough to run your air conditioner, fridge, and lights. For tighter spaces, the B-TEC 300Ah Slim Metal Case offers the same performance with a smaller footprint.
Another premium choice is the Invicta Xero 12V 300Ah Lithium Battery with Bluetooth, delivering reliable power, integrated monitoring via smartphone, and a 7-year warranty—ideal for serious off-grid travellers.
Value Options
For reliable performance on a budget, Renogy offers excellent 12V 300Ah lithium batteries. The Core Mini is compact yet powerful, while the Core Series with Self-Heating maintains performance in colder climates. Both are durable, efficient, and wallet-friendly solutions for off-grid adventures.
Enerdrive Lithium Battery & Solar Bundles
Solar Is Essential
By using solar energy, you can recharge your 12V battery throughout the day, giving you the ability to run your air conditioner at night even without access to 240V power. Solar is a crucial component for any effective off-grid system designed to power an air conditioner. Even if you have a large battery setup, having enough solar capacity to recharge those batteries is essential. Brands like Enerdrive and Renogy provide a wide range of high-quality solar panels that pair seamlessly with your power system and come in various sizes to fit your roof space.
Caravan Solar Panels
If roof space is limited, portable solar panels are another option to boost your 12V battery system. You can build a solar setup tailored to your needs, but remember—when it comes to solar, more is always better. The value of a large battery bank depends entirely on having enough solar power to recharge it. Additionally, every solar system requires a charge controller to regulate battery charging, prevent overcharging, and prolong the life of your batteries.
Enerdrive Bundles
Enerdrive offer a range of 400Ah Lithium Battery & Solar bundles to accommodate running one of these Dometic caravan air conditioners:
If you are just pulling up for lunch and you are doing a lot of driving, you can run your caravan air con unit from your batteries for a short time. Some of our customers do this and as new caravan air con models get more and more energy efficient and lithium battery technology becomes even more powerful, lightweight and affordable, we will no doubt gradually see more of this... see our full range of caravan lithium battery bundles HERE and our power systems HERE.
For the serious off-grid caravan installation we have created an ultimate caravan off-grid bundle exclusively using Victron products, all with a 5 year warranty!
This bundle has a big enough inverter to run any roof top air conditioner on the market. You can easily scale it up by paralleling multiple 200Ah lithium batteries together to increase your run time off the grid.
Victron Ultimate Caravan Off-Grid Bundle
For many of our customers wanting to free camp and use their air con in their van, the best solution is often a caravan/camping generator. You'll need fuel and oil and an extension lead of course, but a good generator will allow you to run your air con for more than 6-8 hours straight without having to worry about re-fueling. In hot climates when you want a good night's sleep in a cool van, this generator option is therefore most likely going to be the best one, unless you have a decent sized lithium battery system.
Recommended Generators
Another worthy mention is cost. It depends on what power system you already have in your van, but if you are starting from scratch, then a new large lithium battery power system can be several thousands of dollars. There are however, a huge amount of benefits that the latest RV lithium battery systems offer for your next adventure, and they can be worth every penny for many customers - some of these benefits can be seen here in more detail in our related article: 'Power on the go: Generator vs. Battery'.
But if we just stick to the the consideration of wanting to run your caravan aircon whilst free camping, you can get yourself a quality inverter generator such as the Cromtech 2400W for over $1,000 or the MaxWatt 2500W for just under $1,100.
So overall, whilst you can run your caravan aircon from a battery bank, its important to know how long you will be able to run it and how long it is going to take you to recharge your batteries. It can be done... but often (although not in every case) a caravan generator is a better and cheaper solution.
Need help selecting a generator to run your caravan air con? Check out our blog post "Running a Caravan Air Conditioner from a Generator" or give one of our product experts a call on 1300 400 122!
Example: 400Ah Off-Grid RV Battery System
Energy-saving tips
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Improve insulation with reflective window covers, thermal blinds, or block-out curtains.
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Park in the shade whenever possible to limit heat buildup inside your van.
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Keep curtains or blinds closed during the hottest part of the day.
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Use a roof vent or 12V fan to circulate air and reduce cooling demand.
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Set your thermostat to a comfortable and efficient range, around 24–26°C.
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Avoid running the AC at full power unless absolutely necessary.
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Use timers or smart energy apps like VictronConnect or Enerdrive ePRO to:
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Monitor system performance
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Track power usage in real time
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Automate settings to prevent overuse
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We would love to hear about how long you run your air conditioner from your battery bank. Comment below!
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DISCLAIMER* Please note, this advice is general in nature and we strongly recommend consulting the product manual and where relevant, a professional installer.
