Esp32 esp8266 and mesh networking

Is anyone else getting into mesh networking capabilities of the esp32 & esp8266 based boards? With a bin full of solar panels and another full of lipos as well as a few dozen of these laying around (as well as a cpl dozen raspberry pi) I am trying to figure the most low power, practical, wide range mesh network to establish. Something that we can implement with 5v or less in the circumstances of say power blackout conditions to cover a small town.
Any and all ideas welcome. Adafruit