Getting started

Off Grid Builder is a to-scale layout designer for off-grid, campervan and marine 12–48 V electrical systems. You draw mounting boards, drag real-size components onto them, wire terminals together, and export the result as drawings and a wiring schedule. Everything on the canvas is stored in real millimetres, so what you design is what you drill.

Designing is free and does not require an account. You pay only when you want to save a design to your account or export it — a one-time $19 (plus tax) per installation, with no subscription. Browsing the parts catalogue, examples and guides is always free.

Two ways to start

Start designing — free (or Design in the header) opens the editor with a blank canvas. Your work autosaves as a draft in your browser as you go.

Guided setup (Get started) walks you through a five-step sizing wizard — Loads, Solar, Battery, Wiring, Verify. You list your appliances, estimate solar input, and it recommends a battery bank for your chosen system voltage (12, 24 or 48 V) and days of autonomy. Nothing is saved and no account is needed; at the end, "Open in the editor" takes you to a fresh canvas to lay out the system you just sized.

A third way in is the examples gallery: open a published design, explore it freely, and clone it into your own installation when you are ready.

Finding your way around

The header runs across every page: Design (the editor), Parts (the catalogue), Examples, Guides (electrical primers), Docs (these pages) and Costs (a live bill of materials for your draft). Signing in adds Dashboard and Add a part. There is also a light/dark theme switcher.

If you are new to off-grid electrics, the Guides section covers the background decisions — battery sizing, wire gauge and fusing, 12 V vs 24 V vs 48 V, and crimping — while these Docs cover how to drive the app itself.