I gave a first shot at prototyping with a teensy, R78 for power regulation, an Attopilot voltage + current sensor and an Olimex LCD display, everything powered by a 100W polycrystalline solar panel (some pictures to come).
I had first naively assumed that I wouldn’t need a UVLO (remember that the whole idea is to have no battery, no sun = no power), but I realize this is not a realistic proposition, since each circuit has a different undervoltage sensitivity, I can’t assume they would shut down and (mainly) reboot gracefully when power is restored if this isn’t done in a controlled way.
For the same reason, most likely, some circuits will be reset on a regular basis.