For caravanners wanting more electrical power away from a powered site, 48V offers real benefits. However, the voltage on the brochure only tells part of the story. Battery capacity, inverter performance, charging capability and the quality of the installation determine what you can actually enjoy at camp.
Why does 48V make a difference?
The biggest advantage is delivering the same power with less current.
Consider a 3,000W electrical load. Using nominal voltages and ignoring conversion losses, supplying that power requires approximately 250 amps at 12V, compared with just 62.5 amps at 48V.
That reduction matters. Higher current requires heavier cabling and creates more heat in cables and connections. A higher-voltage system gives designers more flexibility to manage those demands, particularly when supplying a powerful inverter.
With identical cable resistance, reducing current to one-quarter reduces cable heating losses to one-sixteenth. That is a wiring benefit—not a claim that the entire caravan becomes sixteen times more efficient. Actual efficiency still depends on the components and installation.
More freedom to use the appliances you enjoy
The practical appeal of a well-designed 48V system is the ability to support appliances such as induction cooktops, microwaves, coffee machines and air conditioning away from mains power.
It provides a sensible foundation for caravans with substantial electrical demands. However, running several appliances together still requires enough continuous inverter output, sufficient battery discharge capability and correctly designed circuits.
A 48V badge alone does not confirm any of those things.
Buyers should ask for a demonstration of the appliances they expect to use together, rather than relying on a broad promise that the caravan can “run everything”.
Higher voltage does not automatically mean longer runtime
One of the easiest mistakes is comparing batteries only by their amp-hour rating.
Stored energy depends on both voltage and amp-hours. For example, a 100Ah battery at a nominal 51.2V stores approximately 5.12kWh—the same nominal energy as a 400Ah battery at 12.8V.
Neither automatically provides more runtime. Usable capacity, conversion losses and appliance consumption determine how long the power lasts.
For a simple illustration, a battery with 5kWh of usable energy supplying a steady 1kW load would last less than five hours once system losses are included. Other appliances would reduce that further. Air-conditioning consumption also changes with weather, settings and operating conditions.
Ask for usable kilowatt-hours and realistic runtime estimates with the assumptions explained.
Charging deserves as much attention as battery size
A large battery is useful only if your charging system can replenish it within your travel routine.
Moving to 48V does not automatically increase the energy collected by your solar panels or supplied by your tow vehicle. Solar output, charger ratings, sunlight and vehicle charging limits still matter.
Compatible equipment can charge a 48V system while driving. OzX, for example, offers an 850W DC-DC charger for its caravan power platforms. The important comparison is charging power in watts and energy recovered during a typical drive—not simply the voltage or charging amps.
There are trade-offs
A 48V system can involve additional equipment and integration. Existing 12V appliances need a suitable supply, commonly through a DC-DC converter, which introduces its own capacity limits and conversion losses.
Battery chemistry, weight, warranty and service support also deserve attention. Two systems advertised as 48V can differ substantially in these areas.
For someone mainly using lights, a fridge and water pump, with occasional inverter use, a properly sized 12V system may already meet their needs. The strongest case for 48V is a caravan designed around frequent, substantial electrical loads.
What should buyers ask?
Before purchasing, ask:
How much usable battery energy is included?
What is the inverter’s continuous output?
Which appliances can operate together?
How quickly can the battery recharge from solar, mains and the tow vehicle?
What runtime has been demonstrated, and under what conditions?
Who provides diagnosis, repairs and replacement parts?
Manufacturers announcing a move to 48V are recognising the demands of increasingly electric caravans. But an announcement for next year is not evidence of performance today.
A well-engineered 48V system can deliver a substantial improvement in off-grid comfort. Whether it lives up to the promise depends on the complete package.
Buy the capability you can verify—not just the voltage printed on the brochure.
