Autonomy is the ultimate currency in van life. The ability to drive deep into a national forest or park on a remote beach—and still use an induction cooktop, run air conditioning, and charge your laptops without plugging into shore power—is what turns a standard cargo van into a true home on wheels.
The heart of this freedom is your campervan off-grid electrical system. But when it comes to designing it, most people run into a wall of technical dilemmas. Which voltage should you choose? What fits your travel style better: the time-tested, component-based ecosystem of Victron Energy, or the modular, all-in-one hub from EcoFlow?
At Highland Vans, we build premium custom Mercedes Sprinter, Transit, and ProMaster conversions every single week. We have engineered hundreds of configurations, and in this ultimate guide, we are breaking down everything you need to know to build a reliable power system once, so it lasts for decades.
Part 1: The Voltage Battle — Why 48V is the Ultimate Standard
The very first decision you must make—before buying a single wire or battery—is the system voltage. Voltage dictates wire thickness, energy transfer efficiency, and the types of appliances you can safely run. While 12V and 24V have their place in budget DIY builds, high-end campervans have moved on.
12-Volt Systems: The Old Standard
For decades, 12V was the undisputed standard for RVs.
The Problem: Physics is unforgiving. Lower voltage means higher amperage is required to push high wattage. If you want to run a 3000W inverter for an induction stove or A/C unit on a 12V system, you need incredibly thick, heavy, and expensive copper cables (like 4/0 AWG), which are a nightmare to bend and route through van walls.
48-Volt Systems: The Future of High Power
If your goal is to build a “super-van” that can run a rooftop A/C unit off battery power, cook meals on an induction stove, and heat water simultaneously, 48V (or 51.8V nominal) is the only logical path. This is the standard we build to at Highland Vans.
| Feature | 12V Systems | 48V Systems |
| Amperage Draw | Very High | Very Low |
| Cable Thickness | Thick, heavy, expensive | Thin, lightweight, manageable |
| Efficiency Losses | Noticeable heat and power loss | Minimal to non-existent |
| High-Draw Appliances | Struggles with A/C & induction | Powers A/C & induction effortlessly |
Note: You will need a DC-DC step-down converter to power standard 12V van components (like puck lights and water pumps), but this is a minor trade-off for massive power gains.
Part 2: Power Ecosystems — Victron vs EcoFlow
Once you understand the power of a 48V architecture, it is time to pick your equipment. We install two industry leaders that offer fundamentally different design philosophies, but both operate efficiently on high voltage.
Reliability and Customization: Victron Energy (51.8V)
Victron Energy is the gold standard for industrial and marine-grade power. Their systems are built on a modular, component-based approach. Your inverter (MultiPlus), solar charge controller (SmartSolar MPPT), and chargers are separate physical devices networked together.
The Highland Vans Setup: We pair Victron components with premium Lithionics lithium batteries—specifically their 51.8V nominal battery banks—to create ultra-reliable, bulletproof 48V-class systems.
- Why we love it: Maximum customization and repairability. If a solar controller fails years down the road, your inverter still works perfectly, and you only swap out one part.
- Who it is for: Full-time travelers, overlanders going deep into remote areas, and those who demand absolute fault tolerance.
Compact Innovation: EcoFlow Power Kits (48V)
EcoFlow revolutionized the vanlife industry by offering an “all-in-one” concept that natively operates on a 48V architecture. Their Power Hub combines the inverter, battery charger, solar controllers, and a DC-DC converter into one sleek, compact box.
- Why we love it: Incredible space savings. Instead of dedicating a massive amount of wall space to complex wiring routes, EcoFlow offers one central hub with “plug-and-play” cables. The entire system is managed via a beautiful touchscreen console or smartphone app.
- Who it is for: Perfect for builds where every square inch of living space matters, and for users who love a clean, tech-forward user experience.
Victron vs EcoFlow: At a Glance
| Victron Energy | EcoFlow Power Kits | |
| Architecture | Modular (Separate components) | Integrated (All-in-one hub) |
| Repairability | High (Replace individual parts) | Low (Must service the whole hub) |
| Space Required | High (Requires a large utility board) | Low (Compact footprint) |
| User Interface | Technical and detailed (Cerbo GX) | Highly intuitive and modern (Touchscreen) |
Part 3: How Highland Vans Integrates Off-Grid Power
When we build our signature custom models, we don’t just toss a battery in the back, and we certainly don’t use heavy wood framing to hold expensive electrical gear.
We house our campervan off-grid electrical systems inside our proprietary Universal Utility Cabinets.
Crafted from premium aviation-grade laser-cut aluminum, these modular utility cabinets are ultra-lightweight, incredibly strong, and designed specifically for the demands of van life.
- Ventilation & Smart Cooling: They feature engineered airflow with a vented top plate to keep high-output Victron and EcoFlow components perfectly cool, preventing efficiency drops.
- Durability: Aviation aluminum won’t warp with humidity or crack under off-road vibration like traditional wood cabinets.
- Space-Saving: The precision-cut design allows us to pack massive 51.8V Lithionics batteries or EcoFlow power kits into the tightest possible footprint over the wheel wells, leaving you with maximum garage space for bikes and gear.
Insider Tips for Designing Your System
- Calculate Your Energy Audit: List every appliance you plan to use, multiply its wattage by the hours you will use it daily, and find your total Watt-hours. This dictates the exact battery capacity you need.
- Maximize Solar: The roof of your Sprinter, Transit, or ProMaster is free real estate. Pack it with as much high-quality monocrystalline solar wattage as physically possible.
- Use the Right Housing: Never enclose high-power electronics in unventilated wood boxes. Always use engineered, breathable metal housing like our Universal Utility Cabinets for safety and longevity.
Conclusion: Which is Right for You?
In the Victron vs EcoFlow debate, there is no single right answer—only the right answer for your travel style.
- Choose Victron + 51.8V Lithionics if you are building an expedition-grade rig for full-time, four-season living where individual component repairability is critical.
- Choose 48V EcoFlow Power Kits if you value a clean, minimalist aesthetic, need to save space, and want an incredibly user-friendly app interface.
No matter which path you take, housing it in aviation-grade aluminum and wiring it to a 48V standard is the key to stress-free van life.
Explore our custom campervan builds → Contact our engineering team to start your build — (866) 751-7358
External Links
- To dive deeper into component specifications, visit the official Victron Energy website.
- Learn more about modular 48V architecture at EcoFlow.
