Solar Powered Raspberry Pi

http://www.instructables.com/id/Solar-Powered-Raspberry-Pi/

Create a portable battery and solar powered Raspberry Pi Zero web server

https://www.stewright.me/2017/07/a-portable-battery-powered-raspberry-pi-zero-web-server-with-solar-panel/

How to Use Solar Cells to Power a Raspberry Pi 3 Single Board Computer

https://www.digikey.com/en/articles/techzone/2016/jul/how-to-use-solar-cells-to-power-a-raspberry-pi-3-single-board-computer

How to build a solar powered Raspberry Pi #piday #raspberrypi @Raspberry_Pi

https://blog.adafruit.com/2014/06/20/how-to-build-a-solar-powered-raspberry-pi-piday-raspberrypi-raspberry_pi/

I’ve created a 100% solar powered Rpi web server that runs 24/7 out in the wild.

https://www.reddit.com/r/raspberry_pi/comments/4k25rg/ive_created_a_100_solar_powered_rpi_web_server/

So a brief list of the components:
Raspberry Pi2
16GB Class 10 MicroSD card
4G LTE USB modem
100Wp MonoCrystalline PV panel
52Ah SLA battery
10A Solar charge controller with advanced charging (including float charge) and temperature compensation
INA219 board for voltage monitoring and graphing on the web
12-to-5V stepdown regulator

A well built enclosure for the whole thing to sustain the rain, snow, and the burning 35C during summer