This is definitely achievable! When I was a young, we'd take long road trips and my Gameboy (original) would run out of battery. I'd use a small solar panel (in place of one of the batteries) from a science kit to keep going, propped up against the back window. The wires and panel were held in place with chewing gum (yes, kids can be gross). I did have the "frequent power failures". Props to the team on fixing this :…
That worked quite well because the grid's always been pretty reliable