A single rooftop solar panel can do that, and charge a battery for a little after dark use while you’re at it.

A true prepper will get an eInk monitor and resist the urge to scroll until they read all the way to the bottom of the page, but even a normal monitor uses a small fraction of a solar panel. Keyboard? Near zero. Mouse? Near zero x10 but still near zero when compared with 200W. RasPi? less than a normal monitor.