Every year, thousands of Australians load up the car, hitch the van, and head for the bush — only to discover, somewhere between the second sunset and a warm beer, that their battery wasn't up to the job. It's a common frustration, and almost always preventable.
The difference between a reliable power setup and a flat battery at dawn comes down to one decision: choosing the right capacity for the way you actually camp. A couple running a portable fridge over a long weekend has very different energy demands from a family touring the Nullarbor for six weeks.
This guide breaks down how to size a lithium battery based on your real-world needs — whether you're a weekend warrior or a long-haul tourer. Outbax offers a full range of LiFePO4 deep cycle batteries across capacities and voltages, and the advice here will help you match the right one to your setup.
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How to Calculate Your Campsite Power Consumption
Listing Your Essential Appliances and Their Power Draw
Before comparing battery sizes, start with a simple audit. Write down every appliance you plan to run off-grid: your 12V fridge, LED lighting, phone and tablet chargers, a water pump, perhaps a diesel heater in cooler months. Note each item's wattage — this is usually printed on the device or listed in its manual.
A typical 40-litre 12V compressor fridge draws around 2.5 amps per hour on average. A set of LED strip lights might pull 1 amp. Charging two phones overnight adds roughly another amp-hour. These numbers seem small individually, but they compound over a full day and night off-grid.
Converting Watts to Amp Hours for Accurate Sizing
Battery capacity is measured in amp hours (Ah), but many appliances list their consumption in watts. The conversion is straightforward: divide the wattage by your system voltage. For a standard 12V system, a 60W appliance draws 5 amps per hour. Multiply that by the number of hours you plan to use it, and you have a daily amp-hour figure for that device.
Why Depth of Discharge Matters for Battery Capacity
A 100Ah battery doesn't give you 100Ah of usable energy. Lead-acid batteries should only be discharged to around 50%, which halves the usable capacity. Lithium (LiFePO4) batteries, by contrast, can safely discharge to 80–90% depth of discharge, like in the VoltX 12V 100Ah LiFePO4 battery, without damaging the cells or shortening battery life. This is one of the key reasons lithium has become the preferred chemistry for camping and caravan use — you get significantly more usable watt hours from the same rated capacity.
VoltX 12V 100Ah LiFePO4 battery
Sizing a Lithium Battery for Weekend Camping Trips
Typical Power Needs for a 2–3 Night Setup
A standard weekend camping setup — portable fridge, LED lights, phone charging, and occasional water pump use — typically consumes between 30 and 50 amp hours per day. Over two nights without mains power or solar input, that's roughly 60–100Ah of total energy storage required.
Why a 100Ah Lithium Battery Suits Most Weekend Campers
For the majority of weekend campers, a single 100Ah lithium battery like the VoltX 12V 100Ah Bluetooth Daly LiFePO4 Battery provides a comfortable margin. With 80–90Ah of usable capacity, it covers two to three nights of moderate use without stress. It's also compact and light enough for a portable setup — far easier to manage than the equivalent lead-acid alternative, which would need to be twice the rated capacity to deliver the same usable power.
Here’s what one of our customers said about this battery:,
“Purchased VoltX Lithium battery with 5 year warranty, installed as second battery in my ute. Very happy with battery performance and Bluetooth monitoring features. Good deal on item and fast and reliable delivery.”
Outbax's 100Ah LiFePO4 range is purpose-built for this scenario: reliable overnight power draw, manageable weight, and enough headroom for the occasional unplanned extra night.
VoltX 12V 100Ah Bluetooth Daly LiFePO4 Battery
Battery Sizing for Extended Touring and Caravan Travel
Power Demands During Week-Long and Multi-Week Tours
Extended touring changes the equation. Longer trips mean more appliances running for more hours — an inverter powering a laptop, a diesel heater cycling through cold inland nights, a larger fridge-freezer, and sustained water pump use. Daily consumption can climb to 80–120Ah depending on the rig and the season.
Tourers doing the Big Lap or spending weeks in remote parts of Western Australia or the Top End can't afford to undersize. Running a battery bank below safe discharge levels repeatedly will shorten its lifespan, even with lithium chemistry.
When to Step Up to a 200Ah Battery or Dual Battery System
If your daily consumption regularly exceeds 70Ah, a single 100Ah battery won't provide enough margin. A 200Ah deep cycle battery like the VoltX 12V 200Ah Pro Lithium LiFePO4 Battery doubles your energy storage and gives comfortable autonomy for two or more days without solar input. For larger rigs or higher consumption setups, wiring two batteries in parallel creates a battery bank of 200Ah, 300Ah, or more — scalable to your actual needs.
Pairing Solar Charging With Your Battery Bank
Solar panels are a near-essential companion for extended off-grid travel. A well-matched solar setup can replenish 40–80Ah per day, depending on panel size, angle, and conditions. This means a 200Ah battery like the VoltX 12V 200Ah Slim LiFePO4 Battery paired with a quality solar charging system can sustain moderate touring consumption indefinitely, provided you get reasonable sun exposure — which, across most of Australia, is rarely a problem.
VoltX 12V 200Ah Slim Lithium LiFePO4 Battery
Comparing 12V, 24V, and 48V Lithium Battery Options
12V Systems — The Standard for Most Camping and Caravan Setups
The vast majority of Australian camping and caravan electrical systems run at 12 volts. Most 12V accessories — fridges, lights, USB chargers, water pumps — are designed for this voltage. A 12V lithium battery slots directly into these setups with no additional conversion equipment. For most campers and tourers, 12V remains the practical and cost-effective choice.
When 24V or 48V Configurations Make Sense
Higher voltage systems — 24V and 48V — are typically reserved for larger off-grid installations, such as permanent caravan setups with high power draw or hybrid solar-battery systems for remote cabins. The advantage is efficiency: higher voltage means lower current for the same wattage, which allows thinner cabling and reduced energy loss over longer runs. Outbax stocks 24V and 48V lithium batteries like the and VoltX 48V 100Ah Pro LiFePO4 Battery for these applications, though most recreational users will find a 12V system more than sufficient.
VoltX 24V 100Ah Pro Lithium LiFePO4 Battery
Maximising Your Battery Life on the Road
Charge Cycle Management and Temperature Considerations
LiFePO4 batteries are rated for thousands of charge cycles — far more than lead-acid alternatives. But longevity still depends on care. Avoid storing a fully discharged battery for extended periods, and where possible, keep the state of charge between 20% and 80% during daily use. Australian summers push ambient temperatures well above 30°C in many camping locations; while lithium handles heat better than lead-acid, prolonged exposure to extreme temperatures still affects long-term performance.
Monitoring Power Draw to Avoid Over-Discharge
A quality battery management system (BMS) — built into all reputable LiFePO4 batteries — protects against over-discharge, overcharge, and short circuits. Pairing this with a simple battery monitor gives you real-time visibility of your power consumption and remaining capacity. Knowing exactly where you stand means no surprises on the third morning of a remote camp.
Match Your Battery to Your Adventure
The right lithium battery isn't the biggest or the most expensive — it's the one that matches how you actually travel. Weekend campers who run a fridge, a few lights, and a phone charger can rely on a well-built 100Ah LiFePO4 battery with confidence. Extended tourers covering thousands of kilometres across remote Australia need a larger capacity — 200Ah or a dual battery bank — paired with solar to maintain reliable off-grid power day after day.
Outbax carries a full range of lithium batteries across 12V, 24V, and 48V configurations, from compact 100Ah units for weekend escapes to high-capacity options built for serious touring. Browse the range, match the capacity to your setup, and head out knowing the power will be there when you need it.
