Powering Blue Board

[Alex123]

I am looking for ideas on the feasibility of possibly of powering the system blue.

POE powered:
Use a POE to USB adapter (Something like PoE Splitter with MicroUSB Plug)

Solar with super caps
Use more super caps, but concept is there (Something like 5v Solar Power Supply)

Can anyone lend some incite into how they have been powering their devices outside of the basic USB plug

I use simple linear power suplly. Ordered here: https://famaga.com/catalog.