Give them a laptop and put the solar panel on the side? Even in the exact case you're mentioning, they're better as separate devices. (It wasn't done this way b

Give them a laptop and put the solar panel on the side? Even in the exact case you're mentioning, they're better as separate devices. (It wasn't done this way because the solar panel would be used for other purposes, but treating the user as hostile is the clearest sign that something has gone terribly wrong in your design process.)