Space changes everything
A campervan electrical system faces the same requirements as a caravan setup — battery storage, charging from solar and alternator, 240V output, safe distribution — but with one big difference. You’re working in a space the size of a small bathroom.
In a caravan, there’s usually a dedicated electrical cupboard. In a van conversion, your electrical gear shares space with your kitchen, your bed, and your storage. Every component needs to earn its place. The wiring needs to be tidy because you’ll be looking at it every day. And the install needs to be right the first time, because pulling apart cabinetry to fix a mistake is nobody’s idea of a good weekend.
The four parts every system needs
Every campervan electrical system, from the simplest weekender to a full-time live-in build, has four core elements:
Storage. The battery bank. In 2026, LiFePO4 is the standard for van builds. It’s lighter than lead-acid, discharges deeper without damage, and lasts longer. A single 100–200Ah lithium battery covers most van setups. The battery sits as low and as centrally as possible — weight distribution matters in a vehicle that’s already near its GVM.
Charging. Three sources in a typical van: solar panels on the roof (via MPPT controller), the vehicle alternator (via DC-DC charger), and occasionally 240V shore power (via AC charger or inverter-charger). Most vans rely on solar as primary and alternator as backup. A 200–400W roof panel array is common; more if your roof can fit it and your consumption justifies it.
Inversion. A 12V system covers most things — fridge, lights, fan, USB. But you’ll want 240V for laptops, camera chargers, and the odd kitchen appliance. A 1,000–2,000W pure sine wave inverter covers these without burning power at idle. Cheaper modified sine wave inverters will run most appliances but can cause issues with sensitive electronics.
Distribution. A DC fuse block, properly sized cables, and a main battery isolator switch. The fuse block distributes 12V to each circuit — lights on one fuse, fridge on another, USB outlets on a third. Cable sizing matters: a long run to the fridge needs thicker cable than the short run to the LED strip above the bench. Undersized cable means voltage drop, which means the fridge compressor works harder or the inverter cuts out under load.
The DIY electrical board — and its downsides
Walk through any van-life Facebook group and you’ll see the photos. A plywood board covered in components: DC-DC charger in one corner, MPPT solar controller in another, inverter bolted to the side, busbars, fuses, a shunt, and a tangle of cable between them. It works. But it takes time to plan, time to wire, and it occupies a surprising amount of wall space.
The bigger issue is fault-finding. When your fridge stops at midnight and you’re tracing cables behind a cabinet with a head torch, having six separate components from four different brands doesn’t make it easier. Each one has its own manual, its own error codes, its own support line.
An all-in-one system collapses the board into a single housing. Battery, inverter, MPPT solar charger, and DC-DC charger in one box. One set of terminals. One warranty. The install is a single mounting point and a cable to the starter battery — solar panels plug straight in. That’s hours saved during the build and a simpler system to live with afterwards.
Different vans, different constraints
A high-roof Sprinter or Transit has room for a dedicated electrical cabinet. A low-roof HiAce or VW Transporter doesn’t — every component competes for the same tight footprint. Mid-size vans like the Renault Master sit somewhere between.
The smaller the van, the more an all-in-one system earns its keep. When you’re working with a HiAce where the kitchen bench is 600mm deep and the bed platform sits above it, losing half a square metre of wall space to a component board is a real sacrifice. A single mounted unit that handles battery, inverter, solar and charging means that space goes to storage or bench real estate instead.
Safety that doesn’t happen by accident
Lithium batteries in enclosed spaces need respect. LiFePO4 is the safest lithium chemistry — it doesn’t experience the thermal runaway that older lithium-ion chemistries are known for — but you still need proper fusing, ventilation, and secure mounting.
The main fuse should sit as close to the battery positive terminal as practical. Every circuit downstream needs its own appropriately rated fuse. Cable gauge must match the expected current draw and the length of the run — a 2,000W inverter pulling 170A at 12V through undersized cable will melt insulation before any fuse blows.
A battery mounted in a living space should be in a sealed compartment vented to outside, or use a chemistry like LiFePO4 that doesn’t off-gas under normal operation. The alternative is mounting the system in a garage area or under-body compartment, which is ideal if your van layout supports it.
For more on the charging side of the equation, our guide on DC-DC charging covers alternator, solar, and shore power charging in detail. And if you’re still in the planning stages, our Campervan & Van Life Power solutions page shows how a complete system comes together.
Match the system to how you live
A weekend van demands less than a full-time home on wheels. The electrical system for a couple spending winter in Tasmania needs more storage and more charging than a solo traveller chasing the sun up the Queensland coast.
The build decision that matters most isn’t which brand of inverter you buy. It’s whether you want to spend your build weekends wiring a board, or whether you’d rather bolt in a complete system and get on with fitting out the kitchen. Both approaches have their fans. But if simplicity and serviceability matter — and in a small van, they usually do — the all-in-one route is worth a hard look.