According to :
Actually the solar panels are probably only a reasonable idea if they
park the buggy outside, I would think.

Given how long their trips take, and mostly during the day at that
where lighting isn't necessary, it's probably not an issue.

Someone would have to do some simple calculations with specs
on candidate components to figure out how much daylight they'd
need.

Can't be too impractical, otherwise, solar lights wouldn't work -
usually capable of 8 hours or so using only a square inch or
two of collector and a single AA battery. Scale it up to a 4x4
or larger collector, and reasonably well chosen LED lights, I'm
sure it'd work quite well. Except after long period of truly
abysmal weather.
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.