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====== Power ======
Probably a poly-crystalline solar panel directly connected to some supercapacitors with a boost circuit to get the voltage up high enough to be useful.

Batteries are bad due to temperature sensitivity and cycle limits. Supercaps are better in these regards.

====== Smarts ======
I want as few components as possible. I'll increase the complexity of the smarts as this project progresses. This is the general progression I'll follow, I think:
  - Solar, supercap, boost, LED,
  - Transistor/capacitor to blink LED,
  - Microcontroller to blink morse message,
  - Microcontroller to read non-volatile storage,
  - Time passes...
  - FPGA reading from multiple redundant flash storage chips with error correction.