I’ve followed the discussions involving @Rftop @chipmc @RWB on solar power with interest. I’m developing a carrier board for the boron to act as a data logger. I want to facilitate a variety of power options.
I see that most people seem to be directly connecting solar panels to VUSB and adjusting the input voltage limit to maximise efficiency. I presume that the main aim of this setup is to keep the lipo charged and provide continuous power via that (and using intermittent power from the solar panels to directly power the boron when available).
My use case may involve long periods at low temperatures, when lipo charging isn’t possible. For that reason I was planning to place a couple of super caps across the solar panel, with a zener diode, to provide a bit of solar charge storage. I’m using two 5.6V 15F supecaps in parallel. The zener is a BZX55C5V6. Schottky diode is a BAT43. I’m using a 2W 6V Seeed Studio solar panel. I have an additional 10 ohm resistor on the +ve before the zener.
In your experience, does that setup sound reasonable? Anything critical that I’ve missed? Should I make any adjustments to the boron input voltage limit?
Thanks for your input!