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Resources for learning?
(sh.itjust.works)
A community to discuss Meshtastic (https://meshtastic.org/docs/introduction)
Other mesh communities:
MeshCore: !Meshcore@feddit.org Reticulum: !Reticulum@mander.xyz
The Comms Channel on YouTube is a good start. However, you might want to consider just running a node off the car battery instead of solar. The node will need very little current and won't bother the battery unless you leave your car parked without running for quite a long time.