The free single-line editor for solar.
Draw a real electrical diagram in your browser. Every symbol is actual equipment. Every wire knows its own size. The checks run live as you draw.
Free · no sign-up to start drawing · sign up only when you save.
5,000+permitted plansets run on this engine
This is the actual editor. Hover to zoom in: every wire is labeled, and it checks your work as you go.
It's not a drawing app. It knows what a Powerwall is.
PowerPoint and graph paper don't know a Powerwall from a load center. This does. Pick real equipment from the library and it comes with real specs. Draw a wire and it sizes itself. Change the inverter and the wires update.
The difference between a sketch and a diagram is the data behind it.
Good enough for the forum. Good enough for the inspector.
Draw it. Share it. Let anyone fork it.
Flip one switch and your design opens by link, no account needed. Post it on the forum. Anyone can copy it into their own workspace and mark it up on a real canvas instead of arguing in the comments.
Free, and it stays free.
The full electrical single-line editor. Real equipment, live wire sizing, PDF and PNG export, public share links. No trial clock. No credit card. It doesn't expire.
When you're ready for permit work, there's Pro.
Pro
Meet the Coach. You're still driving.
Pro adds an assistant to your canvas. 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.
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. The paid plan adds roof and panel layout, full permit paperwork, an AI helper, and unlimited designs.
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 need more than 3 designs, roof and panel layout, full permit paperwork, or the AI helper, you can upgrade, and everything you built comes with you.