
Build your perfect 12V electrical system without the guesswork. VoltPlan makes electrical planning for vans, boats, and off-grid setups simple and fun.
A startup from Dusseldorf, Germany.
This page is designed to help you find out whether VoltPlan.app is good and if it is the right choice for you.
VoltPlan is an intuitive web app that helps DIYers, vanlifers, boaters, and off-grid enthusiasts design safe and reliable 12V/24V electrical systems—without needing an engineering degree.
Plan your entire setup with visual wiring diagrams, automatically calculated wire gauges and fuse sizes, and a smart bill of materials. Whether you’re building a camper, outfitting a boat, or powering a tiny home, VoltPlan makes electrical planning simple, safe, and even a little fun.
No signup required. Free forever for personal use.
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Create Wiring Diagrams
Visually plan your entire 12V/24V electrical system—components, connections, and cable sizes—all in one intuitive interface.
Calculate Wire Gauge
Automatically recommends the correct wire size based on voltage, current, and cable length—ensuring safety and minimizing power loss.
Calculate Fuse Size
Instantly determines the ideal fuse rating for each circuit to protect your components and comply with best practices.
VoltPlan is built with Next.js for speed and scalability, DaisyUI for a clean and accessible UI, and PocketBase as a lightweight backend for syncing and persistence. The app is designed to feel fully local and responsive while enabling optional features like cloud saves and sharing.
VoltPlan combines visual wiring design with smart calculations for wire gauge, fuse size, and battery runtime—all in one easy-to-use browser-based tool. It’s built for real-world 12V/24V setups, not just abstract circuits.
VoltPlan is free for personal use, requires no signup, and gives you accurate results tailored to vans, boats, and off-grid systems. While others focus on industrial schematics, VoltPlan puts DIY users first—with a library of real-world components and one-click PDF export.
DIY van builders, boat owners, and off-grid enthusiasts who want to safely plan and share their electrical systems—without spending hours learning electrical engineering.
VoltPlan started as a tool for designing a boat’s electrical system. Frustrated by spreadsheets and inconsistent advice in forums, we built something better: a clear, shareable, and accurate way to plan real-world 12V/24V installations. Today, it helps thousands build with confidence.
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