Visit this post that I answered questions about a solar setup…
Solar Powered several V3 cameras and Motion Spotlight <— Click the blue link
Depending on distance though the 12 volt power supply wired to Low Voltage Wiring connected to 12v to 5v Adapter is cheapest and the easier way to go.
You can bury the Low voltage cable directly using a flat shovel to split ground and tuck it it and push dirt back, or if not through dirt use nail on cable clips if on wood surface. You can get very creative at hiding the wiring. I have ran low voltage cable close to 200 feet…