The free single-line editor for solar.
Draw the wiring diagram your permit needs, right in your browser.
Free · no sign-up to start drawing.
Not a drawing app
It knows what a Powerwall is.
Pick real equipment from the library and it arrives with real specs. Draw a wire and it sizes itself. Change the inverter and the wires follow.
The difference between a sketch and a diagram is the data behind it.
Wire sizes, OCPDs, and ground paths derive from the design. The checker catches what is missing before the inspector does.
Sketch to Diagram · early access
Already drew it? Upload it.
Photograph the one-line you sketched on site, or drop in a PDF or a screenshot from another tool. It gets read symbol by symbol, matched against 22,000+ real equipment models, wired and sized by the same engine behind the editor, then checked against 45 NEC rules. Your sketch becomes a design you can actually work on.
Draw it. Share it. Let anyone fork it.
Flip one switch and your design opens by link, no account needed. Post it, and anyone can copy it into their own workspace and mark it up on the real canvas.
- One switch makes it public.
- Forks are real copies.
- Advice lands on the drawing.
Free, and it stays free.
The full electrical single-line editor. No trial clock, no credit card.
And when you want more power, there's Pro.
Pro
Meet the Coach. You're still driving.
Ask for a change in plain English and it drafts it for you: places the equipment, sizes the wiring, re-runs your checks. You review, you decide.
$15 a month, cancel anytime. Built for electricians, solar designers, and firms that permit through their own engineer. The diagrams you export are permit-grade electrical drawings, yours to submit. Full permit plansets, structural pages included, are separate: first one free, then from $29 per plan set, or our engineers can finish yours.
FAQ
Questions, answered straight
Is the solar diagram tool really free?
Yes. The free plan gives you the whole drawing tool: real equipment, automatic wire sizing, PDF downloads, and share links, with 3 designs in your workspace. No credit card, and there is no trial that runs out. Pro adds an AI helper, deeper permit checks, and unlimited designs. Full permit drawings are their own thing: your first one is free, then from $29 each, or our engineers can finish it for you.
What is a solar single-line diagram?
It is the wiring drawing for a solar system: your panels, inverter, battery, switches, and breaker panel, with a line for each electrical connection. It is the drawing electricians work from and the one most permit offices ask to see. People often call it an SLD.
Can I use this for my DIY solar permit?
You can draw your system and download a clean, professional PDF of it for free. Whether that is enough for your permit depends on where you live: many permit offices accept an owner-drawn diagram for a DIY project, while some want a full engineered plan set with a stamp. If yours wants the stamped version, our sister company Ecuip Engineering makes those for DIY homeowners.
Do I need to install anything, or sign up first?
Neither. It runs in your web browser on a computer, and you can start drawing without an account. Your work stays saved in your browser as you go. When you want to keep it for good or share it, sign up with an email and your design comes with you.
Can I share my diagram on a forum?
Yes, and that is one of the main reasons we built it. Every design has an optional share link that opens in any browser. Nobody needs an account to look. People can also copy your design into their own free workspace and show you what they would change on the actual drawing, instead of trying to describe it in a comment.
What equipment is in the library?
The real stuff DIY systems use: Tesla Powerwall, Enphase, SolarEdge, string inverters, batteries, disconnect switches, breaker panels, meters, generators, and EV chargers. Every part comes with its real specs already filled in, so your drawing matches your actual system.
What happens when I outgrow the free plan?
Your designs stay yours. If you ever want the AI helper, deeper permit checks, or more than 3 designs, you can upgrade to Pro, and everything you built comes with you. Full permit drawings are separate: your first one is free, then from $29 each, or our engineers can finish yours.
Your system, drawn properly, tonight.
Free · no sign-up to start drawing.