Hopefully more efficient ( currently over a 24hr period the battery voltage is the same - the solar charger is making up for what is used ) This will not be the same in the winter but I can plug an external battery pack in if required.
Easily unpluggable external sensors & solar panel
External reset button
Smaller ( used more SMD's, a ESP-12F and a custom 3D printed enclosure )
Integral four Lipo's
Custom enclosure
Extra internal temperature sensor
Monitor solar panel output
Fixing eyes
Still needs a few tweeks and better calibration and not as small as I hoped. The charger and inputs are on the bottom board and the rest of the parts on the top board.
I have headers for UART update and jumpers for setting the pullup or down on GPIO 0, 2, 15