First of all, I added a BOM with links in the GIT repo. I landed below the goal of 150 Euro, but mostly because a lot of stuff was free or had already been lying around my workshop for years.

As the two planned events for which SARAH was made came, she had proven herself worthy. The rough circumstances of a music festival did not do any harm to her. Battery capacity is a total overkill. From fully charged (16.8 V) to about 15.8 V after the festival, which is still well over the nominal voltage. Battery spec lists about 10 V as minimum, I programmed the MCU to switch of at 12 V.

As there are no more events for SARAH planned this year, I will mark the project as finished. Maybe next year, before the next festival, I add things like LED lights and stuff.

It was a fun little project. SARAH was very valuable on the two events! The best thing is that she became a humanized part of our group, everybody knows who SARAH is. :)