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.
Template tools vs this
A template is a picture. A design is live.
Template tools hand you a clean sheet and leave the engineering to you. You still pick the conductor. You still check the breaker. The labels the inspector wants are still your problem, which is why those tools tell you to add them as required.
This editor carries the real equipment specs, sizes the conductors as you connect them, and runs the code checks while you draw. Starting is just as fast. What you end up holding is not the same thing.
A template gives you
- A drawing with generic symbols on it
- Wire sizes you look up and type in yourself
- Labels you add as your AHJ requires
- A PDF, often after you hand over an email
A live design gives you
- Real equipment carrying its own specs
- Conductors and breakers that size themselves
- Code checks running while you draw
- A free export, no email required
If the tool cannot size the wire, you are still doing the engineering by hand. That is fine for a simple job. It is worth knowing which one you are holding when the job is not simple.
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.
Is this a single line diagram template tool?
You can start from a working design instead of a blank canvas, but what loads is a design, not a picture. The equipment carries its real specs, the conductors size themselves as you connect them, and the checks re-run when you change something. A template hands you a drawing to finish by hand. This hands you a design that keeps calculating while you work.
Can electricians use it for work that is not solar?
Yes. Panel upgrades, subpanels, EV charger circuits, and standby generator hookups all draw the same way, with the same live conductor sizing and the same code checks. Solar is where the engine goes deepest, but the electrical side of it is not solar-only.
Do I have to give you an email to download the PDF?
No. Draw it and export it, no account and no email. We ask for an email when you want to save a design for good or share it by link, because those need somewhere to live. The export itself is not a lead form.
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.