SolarToolsAbout SolarToolsPro
What SolarToolsPro is
SolarToolsPro is a free collection of home energy and solar calculators that run entirely in your browser. There's no backend, no login, no tracking of your inputs, and no premium tier. Every calculator on this site does its math in JavaScript on your device — the numbers you type never leave your computer.
The project started from a simple frustration: most online "solar calculators" are lead-generation forms that ask for your email and address before showing any results, then hand your information to three installers who call you for the next six weeks. We wanted the opposite — a tool that gives you the answer first, explains the math transparently, and never asks for anything.
Who built it
SolarToolsPro is built and maintained by a small team of engineers with backgrounds in residential solar, EV charging infrastructure, and grid-edge energy systems. We've worked on the installer side, the manufacturer side, and the customer side, and we built the tools we wished existed when we were answering homeowner questions.
What we believe
Three principles guide everything on this site:
- Transparent math. Every calculator shows the formula and the inputs. You can replicate every number by hand. Nothing is hidden behind a "Get Quote" wall.
- Privacy by design. No accounts. No analytics on calculator inputs. No cookies beyond what's strictly needed. The site works with JavaScript enabled; that's the only requirement.
- Education over sales. Every tool ships with a how-to section, a technical deep dive, and an FAQ. Tools that just spit out numbers are useless if you can't sanity-check them.
How the site is funded
SolarToolsPro is funded through display advertising (Google AdSense). Ads appear on the site but never inside the calculators themselves. We never accept payment from installers, manufacturers, or utilities to recommend specific products. The panel models, battery specs, and rate data in our databases are drawn from publicly available specifications — not sponsored placements.
If you want to support the project, the best thing you can do is share it with someone who's considering solar, a battery, or an EV. The second best thing is to whitelist us in your ad blocker — but we won't be offended if you don't.
What's next
We're adding tools and data continuously. The Phase 1 launch includes ten calculators covering solar, batteries, EVs, bills, and energy audits. Future phases will add: EV range calculators by model, heat pump sizing by climate zone, time-of-use plan comparisons by utility, and a Solar + Battery + EV integrated optimizer.
If you have a calculator you wish existed, tell us. We build what people ask for.