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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.
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Add components, connect wires, and size your cables.
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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.
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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.
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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 DiagramEverything you need to design your electrical system online
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 for boats of any size. Plan your basic 12 volt boat wiring diagram with the right marine-grade components, wire sizes, and fuse ratings.
Design solar panels in series diagrams or parallel configurations. Calculate optimal solar array sizing for your power needs.
Free online 12V wiring diagram creator with automatic wire sizing calculations and component validation.
Everything you can do here, optimized for your phone — and this web app stays free to use.
Generate wiring diagrams programmatically with our open-source MCP server. Connect your AI assistant or automation tooling to VoltPlan via the Model Context Protocol.
Expert guides on RV electrical system design, 12V wiring diagrams, marine wiring, solar panel configurations, and off-grid power systems.
Plan your camper, van, or RV electrical system step by step: calculate power needs, size your battery bank, plan solar, wire it safely, and create a wiring diagram. Free calculators included.
Full Ah to Wh table for 50–400Ah at 12V, 24V, and 48V — plus device runtimes, usable energy by chemistry (LiFePO4 vs AGM), reverse Wh-to-Ah chart, and camper sizing examples. Free calculator for any value.
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