My system, with CHIP, RTL-SDR, and LNA draws between 800mA and 1.1A after startup. Most of that is the CHIP. Some is the USB hub I use to give some more ports for flash memory, or someday, a better WiFi radio.
This centralized Outernet receiver for distributing content around a village could be done at present with a 45W solar array and large capacity battery.
The system could be configured so that the receiver turns on per a schedule. CHIP only during the day, serving up stored content, and RTL+CHIP at night running off the stored energy. Upside of this is the CHIP + RTL only run at night when it's coolest outside, ensuring best receiver performance.
A 45W solar panel gives about 3A at 12VDC. The CHIP by itself only draws about 600mA. That's 2.4A, plenty left over to charge a large battery. Better yet, craft the panel to, instead of 12VDC, be an array of separate 6VDC panels and use multiple 6V storage batteries to eliminate the waste of the voltage converter. CHIP and RTL will probably run fine at 5.9V.
This is obviously going to cost more than $100
RTL - $20
LNA - $20
CHIP - $10
PATCH - $25 (in many areas could substitute a $8 Active GPS antenna)
6W 6V solar panel - $60
2 x battery 5AH - $40
Enclosure - $25
hardware - $10
Could probably be done for much less. If size is not a big issue, 45W 12V solar charging systems are usually about $129 at Harbor Freight. That's a lot of power, and the panel frames could be used to "house" the other components.
And, there's always wind power...