yes nice board ! , I am curious what results you get 
solar powered RPI
- http://www.instructables.com/id/Solar-Powered-Raspberry-Pi/
- http://www.voltaicsystems.com/blog/powering-a-raspberry-pi-from-solar-power/
- https://blog.adafruit.com/2014/06/20/how-to-build-a-solar-powered-raspberry-pi-piday-raspberrypi-raspberry_pi/
- https://www.reddit.com/r/raspberry_pi/comments/4k25rg/ive_created_a_100_solar_powered_rpi_web_server/
- http://www.earth.org.uk/note-on-Raspberry-Pi-setup.html
- http://freneticrapport.blogspot.lu/2013/01/first-raspberry-pi-model-512mb-off-re_24.html
- http://freneticrapport.blogspot.lu/2013/01/raspberry-pi-model-b-to-model.html
- http://freneticrapport.blogspot.lu/2013/02/more-raspberry-pi-power-saving-part-3.html
solar powered Arduino
- http://www.voltaicsystems.com/solar-arduino-guide
- https://www.cooking-hacks.com/documentation/tutorials/arduino-solar/
- https://www.hackster.io/feilipu/battery-powered-arduino-applications-through-freertos-3b7401
sometimes it’s nice to see all the voltages at once when testing , like solarpanel output, step up or charger out, batteries ect.
that’s why I build this quadro voltmeter 
