Comment by orangepurple

20x overspec'd solar panel. No battery. Broadcast a wifi hotspot at minimum radio power. Keep the components cold just above freezing and never allow them to freeze. You can accomplish this by using geothermal engineering to your benefit and burying the device with an appropriate heat exchanger so the planet can regulate the server temperature. Add in high availability and failover by using multiple buried devices connected over ethernet shielded with corrosion and abrasion resistant material at the lowest power and speed settings, then using raft algorithm and heartbeat. Seal everything with heaps of epoxy resin. Cut cable insulation off near where the cable enters the epoxy cube and reseal exposed wire with epoxy. This way water cannot wick into the main epoxy cube.