The short version: there is almost nothing to collect, because almost nothing reaches a server.
Every calculator on this site runs entirely in your browser with JavaScript. The numbers you enter — loads, lengths, irradiance, battery sizes — are never transmitted, logged, or stored anywhere. Close the tab and they are gone.
Light/dark mode choice is stored in your browser's localStorage under the key
theme. It never leaves your device and can be cleared with your browser's
"clear site data" function.
None. No Google Analytics, no ad pixels, no fingerprinting, no cookies set by us.
The site is served as static files by Cloudflare. Like any web host, Cloudflare's network sees standard request metadata (IP address, user agent) under its own privacy policy. We have no access to or control over that layer beyond serving static content.
If you email us about an error or question, we use your message only to reply and, where an error is confirmed, to fix it. Messages are not added to any mailing list.
Last updated: October 2026.