I think you're trying to assign the first scenario you thought of and project that as other's viewpoint when it isn't. The main use-case I can think of for thi

I think you're trying to assign the first scenario you thought of and project that as other's viewpoint when it isn't. The main use-case I can think of for this would be as a low-power PC at a basecamp connected to a solar source. During extreme weather or events you would close it, it could be transported safely via raft / boat / etc. I find the descriptor "off-grid" apt to indicate this. Under your scenario of being mobile in some sort of doomsday scavenging scenario, a mobile phone would be appropriate. This isn't suited for that, but I don't think anyone suggested it to be.