I re-tested the exact same as my last post but with "oled-exp dim on" set and it lasted from midnight to 10:19am. So the brightness of the OLED can pretty significantly increase battery duration :)
And yes @Lazar-Demin , solar panel status and the 1-wire temperature reading for the temperature of the room the Onion is in.
The photo was taken at night while the inverters were not producing power.
https://gfycat.com/FoolhardySizzlingIzuthrush
I just need to make some sort of case / caddy for the Onion to go in so I don't feel like I"m carrying around a fragile egg!
Summary:
Onion + Power Dock + 1-Wire Temperature Sensor + Ping + reading 1-wire every 2 minutes = 11 hours 19 minutes.
Onion + Power Dock + 1-Wire Temperature Sensor + Ping + reading 1-wire every 2 minutes + OLED Expansion on default brightness + 5 second wgets and displaying returned data on OLED = 8 hours.
Onion + Power Dock + 1-Wire Temperature Sensor + Ping + reading 1-wire every 2 minutes + OLED Expansion on the lower brightness setting + 5 second wgets and displaying returned data on OLED = 10 hours 19 minutes.