Building a True 240V Off-Grid Power System for Your Campervan

If you're planning to work from your van — running laptops, monitors, coffee machines, or even power tools — a basic 12V leisure battery and an inverter from the back of a drawer won't cut it. Digital nomads need power for remote working that behaves like it does at home: stable, silent, and available whenever you need it. That means building a proper 240V off-grid electrical system, not bolting one together.

Here's how we approach it on our builds, using Victron Energy components throughout for reliability and because their ecosystem talks to itself — everything from charging to monitoring runs through one connected system.

Quick specs at a glance:

• Inverter/charger: Victron MultiPlus II 3KW

• Distribution: Lynx bus bar system

• Driving charge: Orion XS 50A DC-DC charger

• Shore/generator charge: Victron 30A 240V smart charger

• Solar: ~500W panels with sized Victron MPPT controller

• Battery bank: Fogstar LiFePO4 (460Ah–668Ah on bigger builds)

• All circuits: correctly rated breakers and cable gauging throughout

Start With the Heart of the System: The MultiPlus

The Victron MultiPlus is where your build earns the word "system" rather than "setup." It's a combined inverter and charger in one unit — meaning it pulls 240V from shore power or a generator to charge your batteries, and then inverts your battery bank's DC power back into clean 240V AC when you're off-grid. For anyone running sensitive electronics (laptops, monitors, induction hobs), the MultiPlus's pure sine wave output matters: it's the same clean power quality you'd get from a domestic socket, so equipment runs safely and efficiently without the buzzing or overheating you can get from cheaper modified-sine inverters.

Distribution Done Properly: The Lynx Bus Bar

Once you've got power, you need to distribute it safely across multiple circuits — batteries, the MultiPlus, charging sources, and any DC loads. This is where the Lynx Distributor and bus bar system comes in. Rather than a tangle of individually wired connections (a common failure point and fire risk in DIY builds), the Lynx system gives you a single, fused, easily inspected hub for all your high-current DC connections. Every leg of the system — battery bank, inverter, chargers — ties into it through properly rated fuses, so a fault in one branch can't take down the whole system or, worse, start a fire.

Keeping the Batteries Topped Up: Multiple Charging Sources

A van built for full-time work and travel needs more than one way to charge, because you won't always have the same power source available.

• Driving: The Orion XS 50A DC-DC charger takes power from your alternator while you drive and feeds it safely into your leisure battery bank, isolated from your starter battery. It's a smart charger, so it adjusts its charge profile to your battery chemistry rather than just dumping in raw amperage.

• Shore power or generator: The Victron 30A 240V smart charger handles AC-in charging when you're plugged into a campsite hookup or running a generator, topping up the bank efficiently and safely.

• Solar: For sun-powered charging, we size the solar array — typically around 500W of panels for a van this size — to a Victron MPPT charge controller matched to that array's voltage and current output. MPPT (Maximum Power Point Tracking) technology means the controller constantly adjusts to pull the most possible power from the panels regardless of sun angle or temperature, rather than the fixed-voltage approach older PWM controllers use.

  
  

Between driving, plugging in, and sitting under the sun, the system has redundancy built in — so a cloudy week or a static stay somewhere without hookup doesn't leave you without power.

The Bank Itself: Why We Build on Fogstar

All that charging infrastructure needs somewhere reliable to store the energy, which is why our go-to for the battery bank is Fogstar's lithium (LiFePO4) cells. Capacity is sized to the build — for bigger setups with heavier daily power demands, we typically spec the bank between 460Ah and 668Ah. Lithium iron phosphate chemistry gives you a battery that's safer than older lithium chemistries, tolerates deep discharge without the rapid degradation you'd see from lead-acid or AGM, and delivers thousands of charge cycles rather than hundreds — which matters when you're cycling the bank daily on the road. At that capacity range, larger builds have enough headroom to run laptops, monitors, fridges, and daily life off-grid for days without needing to plug in.

Fogstar's batteries pair well with the Victron ecosystem: their built-in battery management system (BMS) protects against over-charge, over-discharge, and temperature extremes, while communicating cleanly with the MultiPlus and MPPT controllers so the whole system charges and discharges the bank correctly rather than working against it.

The Unglamorous but Critical Part: Breakers and Cable Sizing

This is the part that doesn't photograph well but is where most amateur electrical builds go wrong. Every circuit in the system is protected with correctly rated breakers, sized to the maximum current that circuit will ever see — not guessed, calculated. Cable gauging follows the same principle: cable that's too thin for the current it's carrying heats up, wastes energy as resistance, and in the worst case, becomes a fire hazard. We size every run — from the battery bank to the Lynx bus bar, from the bus bar to the MultiPlus, from the solar array to the MPPT — based on current draw, cable run length, and voltage drop, not off-the-shelf assumptions.

It's the difference between a system that works on day one and a system that's still working reliably three years and 50,000 miles later.

Why This Matters for Working on the Road

For someone earning a living from their van, power isn't a convenience feature — it's infrastructure. A dropped inverter mid-video call, an overloaded charge controller, or a fault with no proper fusing isn't just inconvenient; it can mean lost income or a fried laptop. Building the system around proven, monitorable components like the Victron range and a Fogstar battery bank means you're not guessing whether you'll have power tomorrow — you can check state of charge, charging status, and system health from an app, the same way you'd check anything else in your daily workflow.

A well-built 240V off-grid system turns a van from "camping with a laptop" into a genuine mobile office — one that just happens to have a view that changes every day.

Thinking about a build like this? Get in touch and we can start building a true 240V off-grid power system for your campervan, sized to how you actually work and travel.