Free campervan electrical design tool
Plan your build with confidence.
Size your battery, solar, inverter, cables and fuses in minutes—then turn the plan into a complete campervan build.
One platform, the whole journey
Start wherever you are in van life.
Roam Wired connects the research, design and marketplace decisions that normally live across dozens of tabs.
Plan
Design your electrical system
Turn your appliances and travel style into a calculated electrical design, wiring diagram and parts list.
Create my electrical design
Learn
Build it properly
Follow practical guidance across electrics, plumbing, insulation, heating, furniture and layouts.
Explore Learn
Marketplace
Find your next move
Compare conversion companies, campervan hire and converted vans for sale.
Open the marketplaceNot a number. A complete design.
Most calculators give you a battery size and wish you luck. Roam Wired gives you the whole system: an interactive wiring diagram, a cable schedule, a fuse schedule, a parts list, and step-by-step installation notes — every value traceable to a real calculation.
Roam Wired Marketplace
Find the people, vans and trips that move your plan forward.
Use the free electrical design tool to turn what you learn into a wiring diagram, calculated cable and fuse sizes, and a connected parts list.
Learn the whole conversion
Good builds come from seeing how every system connects.
The electrical library is now the foundation of a wider conversion knowledge base—organised around real build stages and the decisions people actually make.
Three steps. No jargon.
You don't need to know what an amp-hour is. Answer plain questions, get a professional design.
Pick your appliances
Fridge, lights, laptop, kettle — tick what you’ll run in your van and how long you’ll use it each day.
Choose your preferences
Battery type, budget, solar, off-grid time. We handle every calculation behind the scenes.
Get your design report
Wiring diagram, cable & fuse schedules, parts list, and install notes — free, in about 5 minutes.
Calculated, not guessed.
Forum threads disagree. YouTube comments argue. Your design shouldn't depend on whichever opinion you read last.
Built on real standards
Every recommendation follows Victron’s Wiring Unlimited, Blue Sea / ABYC guidance, and BS 7671 Section 721 — the UK regulations for electrical installations in caravans and motor caravans.
Show-the-maths transparency
Click any component or cable in your diagram and see the exact calculation behind it. No black boxes, no "trust us".
Honest about limits
Anything involving 230V mains, we’ll tell you plainly: have it done or signed off by a qualified electrician. Your safety outranks our convenience.
Go deeper
Practical guides for every stage of your campervan conversion.
Integrated campervan power systems (EcoFlow PowerKits, Victron-based all-in-one, Zamp Solar kits) vs building your own — what you gain, what you give up.
Series vs parallel wiring for campervan leisure batteries — what each configuration does, when to use each, and common mistakes to avoid.
How to size battery cables for a campervan — mm² ratings, current capacity, voltage drop calculations, and what cable to use for each circuit.
Stop second-guessing your build.
Five minutes from now you could have your complete electrical design — every wire, every fuse, every part.
Create my free electrical designFree · No sign-up to start · Takes about 5 minutes