Choosing between a 12V and 24V camping battery setup sounds more technical than it really is. The voltage you run affects everything from wiring efficiency and inverter performance to what appliances you can comfortably power off-grid. For most Australian campers, a well-built 12V system remains the practical choice. It comfortably runs essentials like fridges, lights, phone chargers and CPAP machines while keeping installation simple and accessory compatibility high.
A 24V setup starts making sense when power demands climb into heavier inverter territory, particularly when continuous loads push beyond roughly 2000W or when caravan air conditioning needs to run from battery power for extended periods. In the Outbax camping range, that role is served by the VoltX 24V 100Ah Pro LiFePO4.
Why This Question Keeps Coming Up
The 12V or 24V decision quietly locks you into an entire ecosystem of chargers, regulators, inverters, fuses, and accessories. Get it right the first time, and the rest of the build falls into place. Get it wrong, and you spend the next season pulling things back out of the canopy.
The question turns up again and again on Australian 4WD forums and caravan Facebook groups for a simple reason. Most touring rigs in this country are built around a 12V house bank. The fridge plugs in at 12V. The water pump is 12V. The LED bar, the USB sockets, the awning lights, the second cigarette socket feeding the inverter, all 12V. Then someone watches a YouTube van build from the United States, where everything runs at 24V or 48V, and the question lands in the comments below every camping battery review on the internet.
Gentrax 12V 200Ah Lithium LiFePO4 Battery
What 12V Actually Looks Like in an Australian Rig
A 12V LiFePO4 house bank is the default for one reason. It matches the rest of the rig. Your alternator charges at around 14.4V. Your DC-to-DC charger drops alternator current into the house bank without any conversion beyond what the charger does natively. Every camping fridge sold in this country runs on 12V. The MPPT solar regulator paired with your panel is 12V. Wiring is straightforward, fusing is conservative, and if something fails on the side of the Oodnadatta Track, the part you need is sitting on the shelf in any Auto One.
Outbax's 12V range covers the main scenarios. The VoltX 12V 100Ah Pro is the workhorse. The 100Ah Slim variant at around 11kg fits behind the back seat of a dual cab or under a canopy floor where there is no room for a standard footprint. The 100Ah Bluetooth Daly version lets you watch the state of charge from your phone, which is genuinely useful when the battery is buried in a hard-to-reach corner of the rig. For longer trips or bigger setups, the 12V 200Ah Pro doubles capacity in the same chemistry without changing anything else in the system.
Here’s what one of our customers said:
“This is my 2nd purchase of this type of battery from Outbax. These 2 are for my caravan, I have a 300amp which is now 3+ years old and still going strong in the 4wd.”
Gentrax 12V 100Ah Lithium LiFePO4 Battery
What 24V Actually Solves
The case for 24V is narrower than the internet suggests, but it is real. The single problem 24V solves cleanly is high continuous current. Power equals voltage times current. A 2500W inverter pulling a clean sine wave AC from a 12V bank draws roughly 210A continuously. At 24V, the same inverter draws around 105A. Half the current means you can use thinner cable, smaller fuses, and you avoid the voltage drop that punishes long cable runs.
For most camping setups, this never matters. A 60L fridge at 4A, an LED light bar at 5A, USB charging at 3A, and a CPAP at 6A is a load profile that 12V handles comfortably for nights on end. The 24V argument only becomes physically meaningful when you start running a small reverse-cycle air conditioner off the inverter, an induction cooktop for any sustained period, or a microwave you actually use for cooking rather than reheating. Those are caravan use cases, not 4WD touring use cases.
The VoltX 24V 100Ah Pro at $1,329 is the only dedicated 24V camping battery in the Outbax range. Outbax has been deliberate about that. Most camping buyers simply do not need a 24V setup, and pushing higher-voltage systems where they are unnecessary often leads to added cost, unnecessary complexity and, ultimately, customer returns.
VoltX 24V 100Ah Pro Lithium LiFePO4 Battery
The One Inverter Question That Decides It
If you want a single test that tells you which way to go, it is this: what is the continuous inverter load you actually plan to run, and for how long?
Below 1000W continuous, 12V is comfortable. Cable sizing is sensible, fusing is standard, and your existing 12V accessories all keep working. Between 1000W and 2000W continuous, 12V remains viable provided you size the cable correctly and mount the inverter close to the battery. Once continuous loads start sitting above 2000W for any meaningful length of time, the current at 12V becomes uncomfortable. Cabling gets heavy and expensive. Voltage drop across the run becomes a measurable loss rather than a footnote. That is the point where 24V earns its place.
Peak load is not the same as continuous load. A 3000W peak inverter that mostly runs a 200W fridge and the occasional 1200W kettle does not need 24V. A 2500W inverter that runs an air conditioner for two hours each evening does. The honest test is the one you can run yourself with a spreadsheet and a clear head before you spend any money.
VoltX 12V 1KW Pure Sine Wave Inverter + FREE VoltX Inverter LCD Display
The Hidden Costs of Moving Up to 24V
The price on the 24V battery itself is only the beginning. A 24V house bank needs a 24V-compatible AC charger, because the standard LiFePO4 chargers sold for the 12V market output 14.6V and will not charge a 24V pack. It needs a 24V-compatible MPPT solar regulator. It needs either a 24V alternator setup, which is rare in Australian vehicles, or a 12V to 24V boost DC-to-DC charger if you plan to top up while driving, and those units are more expensive and less common than their 12V to 12V cousins.
Then there is the step-down converter that keeps your 12V fridge, lighting, and water pump running off the 24V bank, because none of those accessories will work directly on 24V. By the time you stack those costs, the move from 12V to 24V is rarely the $700 swap people expect. It is more often a $1,200 to $1,800 reconfiguration. For many buyers, the cleaner move is to double capacity at 12V and leave the rest of the rig alone.
Can I Just Wire Two 12V Batteries in Series?
Technically, yes. In practice, it is the option that creates the most regret. For series wiring to work reliably, both batteries need to be the same make, the same model, the same age, the same cycle count, and ideally from the same manufacturing batch. They need to be at the same state of charge before you connect them. Two separate BMS units now have to play nicely under load, and if one trips out for overcurrent or overtemperature, the entire 24V output drops with it. Replacement becomes painful later because the survivor is now mismatched against any new battery you buy.
The VoltX 24V 100Ah Pro avoids all of this with one chemistry pack, one BMS, one warranty, and one set of terminals. If you genuinely need 24V, buy the voltage you need rather than engineering it out of two 12V batteries.
Worked Example: The Weekend 4WD Camper
A dual-cab ute with a canopy, a 60L fridge, an LED bar, two phones charging overnight, and a CPAP machine sits around 70 to 90Ah of consumption per night. A 100Ah lithium house bank handles a long weekend on its own without solar, and a 200W folding panel will keep it topped up indefinitely. The VoltX 12V 100Ah Slim is built for the canopy install, the standard is built for under-seat or under-tray, and either runs on the SRNE 25A AC charger when you are home. No inverter discussion, no step-down converter, no voltage drama. This is where 12V earns its reputation.
Worked Example: The Caravan with Air Conditioning
A 22-foot caravan with a 2500W pure sine wave inverter running a small reverse-cycle aircon for two hours each evening, plus the usual fridge, lights, water pump, and TV, is where the maths actually changes. Sustained current draw at 12V approaches 200A. At 24V, it sits closer to 100A, with cable and fusing sized accordingly. The VoltX 24V 100Ah Pro, paired with adequate solar capacity and a 24V-compatible MPPT regulator, handles this kind of load without the cable headaches. Outbax has built the 24V Pro for this kind of buyer, not for the general camping market.
The 12V 200Ah Middle Path
A lot of buyers reach for 24V because they assume higher voltage automatically means more capacity. It does not. The VoltX 24V 100Ah Pro stores roughly 2,560Wh. The VoltX 12V 200Ah Pro stores roughly 2,560Wh. The difference is how that energy is delivered, not how much energy there is. If your inverter load stays below 2000W continuous and your fridge, lights, and pumps are all 12V, doubling capacity at 12V gives you the same usable energy without the ecosystem rebuild.
The Final Word
Pick 12V unless your continuous inverter load gives you a clear reason not to. If the load is genuinely there, the VoltX 24V 100Ah Pro is a cleaner answer than two 12V batteries in series. Either way, the right battery is the one that matches the rest of your rig. The voltage on the spec sheet is not the prize. The trip you take with it is.
