Solar panels are devices that convert light into electricity. They are called “solar” panels because most of the time, the most powerful source of light available is the Sun, called Sol by astronomers.
Run a DC pump to your camp shower. Or run the lights around the camp or to charge cell phone batteries or to run your DC fans when needed. It can charge sailboat batteries or charge a battery for an electric trolling motor. The 50w solar panel can also charge an electric fence in the pastures.