To-scale, to the millimetre
1 unit = 1 mm everywhere. Boards, footprints, terminal offsets and wire thickness are all real dimensions — the drawing is the build.
To-scale off-grid · 12–48 V
Stop guessing at amps, volts and cable.
Off Grid Builder lays your 12–48 V system out to scale, sizes every cable, checks every fuse, and totals the parts — before you spend a cent.
119
Manufacturer-sourced parts with real dimensions and terminal layouts.
$19
One-time to export a build. Designing and cloud-saving are free — no subscription, ever.
01
Layout
Millimetre-accurate footprints, drawn to real size.
02
Cable
Voltage drop sized per run, live as you wire.
03
Protection
Fuse ratings matched to the cable.
04
Costs
A bill of materials that totals itself.
How it works
Three steps from blank board to buildable plan
- 01
Draw your boards
Sketch the real mounting surfaces — a bulkhead, a battery box, a switch panel — as to-scale polygons. Every millimetre is exact at any zoom.
- 02
Drag in real-size parts
Pull batteries, MPPTs, inverters and busbars from a manufacturer-sourced catalogue. Footprints and terminals match the datasheets, so if it fits on screen it fits in the van.
- 03
Wire it and let the maths run
Connect terminals and get live gauge, fuse and voltage-drop calculations as you go — then export a 1:1 PDF, DXF and a full wiring schedule.
Why it's different
Not a diagram tool that happens to draw wires
Real electrical calcs
Correct cable gauge, fuse rating and voltage drop for every run — the safety maths, not a guess.
Exports that print 1:1
PDF, PNG, DXF and a wiring CSV listing every cable: run, gauge, fuse, length.
A curated, sourced catalogue
Batteries, MPPTs, inverters, DC-DC, wind and generator inputs — with real footprints and terminal layouts.
Guided or blank canvas
Answer a few questions and get a starting system, or open an empty board and build it your way.
Pricing
Free to design. $19 to export.
Designing is free with no signup, and a free account cloud-saves your design. You only pay to export the print-ready files for your own system — a car, caravan, boat or cabin — a one-time $19 per installation, no subscription, ever.
Built with Off Grid Builder
Real builds, coming soon
As people finish their systems, their installation photos will appear here. Design yours and you could be the first. Browse example layouts →
Questions
Before you start
Why $19?
Designing, cloud-saving and browsing examples is completely free. The one-time $19 unlocks exporting one installation's print-ready files — no subscription, no per-export fees.
Do I need an account?
Design free with no signup; create a free account to save your design and come back to it on any device (up to 3 free); $19 per installation to export the print-ready files.
Can I keep editing a paid design for free?
Yes. Once an installation is unlocked, you can edit, re-export and refine it as much as you like at no extra cost.
What do I actually get?
A to-scale wiring layout, live gauge/fuse/voltage-drop calculations, and exports: a 1:1 PDF, PNG, DXF and a wiring schedule CSV covering every cable.