Quick project update: after the first generation (S1/D1), I now have the 2nd generation variants ready and running:

• S2: single-axis (elevation)
• D2: dual-axis (elevation + azimuth)

Both versions are 3D-printable, ESPHome-based, and built for practical real-world use, not just bench demos.

S2 is the lower-complexity option with solid gains over static mounting. D2 adds azimuth tracking and is the best-performing variant for maximum daily yield.

I’m also publishing regular measurement series and analysis reports from real operation. The short version of the results so far:

• D2 yields about +12% compared to S2 (single-axis)
• both trackers massively outperform static orientation
• in one representative comparison, the tracker setup reached up to +144% vs static east/west references (time-window dependent)

Measurement overview and linked daily reports: https://github.com/Nerdiyde/Sunchronizer/blob/main/docu/measurements/MEASUREMENT_OVERVIEW.md

If there’s interest, I can post a follow-up with a direct S2 vs D2 build comparison (mechanics, BOM differences, and recommended setup path).

If you want to support me by building one: The STL files are available to buy here:

• Sunchronizer S2 (Printables): https://www.printables.com/model/1574048-sunchronizer-s2-400w-module-solartracker-for-eleva
• Sunchronizer S2 (Cults): https://cults3d.com/de/modell-3d/gadget/sunchronizer-s2-400w-module-solartracker-for-elevation-axis-by-nerdiy-de-new
• Sunchronizer D2 (Printables): https://www.printables.com/model/1574049-sunchronizer-d2-400w-module-solartracker-for-eleva
• Sunchronizer D2 (Cults): https://cults3d.com/de/modell-3d/gadget/sunchronizer-d2-400w-module-solartracker-for-elevation-azimuth-axis-by-nerdi