Original Summary

Solo developer in Germany here. Over the last months I built a small app that does one thing: you give it a photo of a roof (drone shot, satellite screenshot, phone photo from the street), and it works out how many panels fit and where. How it works Mark the four corners of the roof slope. The app straightens the perspective. For trapezoid or triangular slopes (hips, gables) it reads the perspective from the tile pattern instead of the outline, because those slopes aren't rectangles and forcing them into one just distorts the photo. Set the scale: draw a line along something with a known length, or pick your tile type and let it count tiles automatically. Enter your module size and hit Fill roof. Draw exclusion zones for chimneys, skylights, vents. Set edge margins. Shifted rows and mixed orientation are optional, for roofs that narrow toward the ridge. Export an A4 spec sheet (PNG/PDF) or JSON with the coordinates of every panel. Screenshots: marking the slope , automatic layout with skylights excluded , row shifting fitting two more modules . What it is NOT: no shading analysis, no yield simulation, no string sizing, no 3D. It covers the "how many modules fit on this roof and what does the layout look like" step, the thing you do before a quote, or before deciding whether it's worth asking for quotes at all. Free, no account. macOS app, Windows installer, and a browser version where the photo never leaves your machine (everything runs client-side, no uploads). 11 languages. What I'd like to hear from people who actually work with roofs: Does the perspective straightening hold up on your photos? It's tuned on my own set of drone and street shots. I need photos that break it. What do you use for this step today? Aurora, OpenSolar, PVSketch, pencil and paper, Google Earth? What's missing before you would use it for a quote or a customer conversation? Is an A4 spec sheet the right output, or would you rather have something else (DXF, a per-panel list, a different report)? Download: https://tegrona.com/lite/ — browser version: https://tegrona.com/planner/ Happy to go into detail on how the tile detection works, that was the hard part. Criticism welcome, that's the point of the post.   submitted by   /u/Herr_Scherer [link]   [comments]

  • 情报分类：商业与市场研究
  • 分类依据：内容涉及商业、投资或市场动态
  • 信息来源：Reddit · SideProject
  • 发布时间：2026/9/13 20:30:48