As you are no doubt aware, we enjoy quality retro mods here at Nintendo Life - we may love our decades-old gaming gadgets, but sometimes improved screens, batteries and inputs are very welcome indeed. We particularly like the example above, then, of the 'Ultimate Solar Powered Game Boy Pocket'.
That video is a lengthy one that goes over the concept, build and then potential improvements, produced by The Houston Museum of Natural Science. It's an excellent watch, as the producer has a genuine love for the hardware and the idea of modding it in a unique way.
The solar panel is part of wider improvements, namely a superior screen and an up-to-date rechargable battery. The solar panel allows for trickle charging in natural light; this doesn't have to be outside in the blazing sun, it should be noted. Whenever you want to play the system is, theoretically, good to go.
It's well worth finding a cozy seat and nice beverage for a watch, and at the end there's even a section outlining potential improvements for those that fancy giving it a try.