I recently built a solar-powered Meshtastic node using a Heltec v3. The aim was to create a self-sustaining node that could operate without external power sources.
Hardware
Power-Saving Settings:
https://meshtastic.org/docs/configuration/radio/power/#power-saving
meshtastic --set power.is_power_saving true
meshtastic --set display.screen_on_secs 5
meshtastic --set bluetooth.enabled false
meshtastic --set power.on_battery_shutdown_after_secs 0