RV & Boat Electrical System Design12V Wiring Diagram Creator
Plan safe 12V wiring for your camper van, RV, boat, or off-grid build. Wire sizes, fuse ratings, and solar layouts are calculated for you — so you get it right the first time.
Start Your Wiring DiagramNo signup required • Free 12V wiring diagram creator • Export anytime
How It Works
From blank canvas to finished wiring diagram in minutes
Choose a Template
Pick a starting point for your RV, boat, or off-grid project.
Customize Your System
Add components, connect wires, and size your cables.
Export and Share
Download your diagram or share a live link with your installer.
Choose Your 12V Wiring Diagram Template
RV Electrical System Design
Plan your RV's 12V system online with our free wiring diagram creator. Design complete camper electrical systems with solar panels in series or parallel, battery banks, and shore power connections.
Start RV Wiring Diagram
Marine Wiring Diagram Software
Design basic 12 volt boat wiring diagrams with our free marine wiring diagram software. Create complete marine electrical systems with proper DC wiring, battery switches, and navigation electronics.
Start Boat Wiring Diagram
Solar Panels in Series Diagram Creator
Design off-grid solar power systems with our 12V wiring diagram creator. Create solar panels in series diagrams, parallel configurations, and complete battery bank setups for cabins, tiny homes, and remote installations.
Start Solar DiagramFree 12V Wiring Diagram Software
Everything you need to design your electrical system online
RV Electrical System Design
Create complete RV wiring diagrams with our intuitive drag-and-drop interface. Design shore power connections, battery systems, and 12V distribution panels.
Marine Wiring Diagrams
Marine wiring diagrams for boats of any size. Plan your basic 12 volt boat wiring diagram with the right marine-grade components, wire sizes, and fuse ratings.
Solar Panel Configurations
Design solar panels in series diagrams or parallel configurations. Calculate optimal solar array sizing for your power needs.
12V Wiring Diagram Creator
Free online 12V wiring diagram creator with automatic wire sizing calculations and component validation.
It's even better as an app.
Everything you can do here, optimized for your phone — and this web app stays free to use.
- Full DC system design — batteries, loads, chargers, solar
- Cable sizing, fuse ratings, and voltage-drop checks done for you
- Export the plan or open it in VoltPlan when you're back at the desk
For Developers: MCP Integration
Generate wiring diagrams programmatically with our open-source MCP server. Connect your AI assistant or automation tooling to VoltPlan via the Model Context Protocol.
You're Part of the VoltPlan Family
As an early adopter, you're not just a user — you're helping us build something amazing. Every suggestion, every piece of feedback makes VoltPlan better for everyone.
What we're building together:
Smart Wire Calculator
Never guess wire sizes again
One-Click PDF Export
Share your plans anywhere
Huge Component Library
Find exactly what you need
Power & Runtime Calculator
Plan with confidence
We'd love to hear from you!
Drop us a line at feedback@voltplan.com
Join our Discord community
Connect with the VoltPlan family discord.gg/evemrYpHZt
Create Your VoltPlan Account
Create your account to save diagrams and access advanced features.
Ready to design your electrical system?
Join thousands of RV, boat, and off-grid enthusiasts building with VoltPlan.
Start Your Free Diagram