As the title says, a cranked battery charger, be it hand or bicycle style, preferably both portable and fixable in one; So it can be used to charge a battery/power a grid...
I think a modded APC/portable generator would work...

For a survival game, especially where power is VITAL, there is suprisingly no emergency failsafe, so unless you are already well set, and have made backups, you are doomed if ya run out of power! This goes double for droid players.

We have a portable solar charger but its too slow, and works only on surface and sunny worlds, and to my knowledge cannot be conected to grid. While i find it ok for most scenarios, where you have to recharge your tool / small batteries while exploring, but its mostly so ineficient that its better to make the solar panel on a frame for any reasonable recharge time!

Cranked power is somethin i would like to have, a great supplement to small outposts (or even their main power), and exploring (not to mention would work great for those who do deep mining). I often get into scenarios where i cant use the portable solar charger, but i need just a bit of power (either to survive, charge a tool to do just one more action, get some juice for that airlock that got stuck mid work or even charge just one machine ower night to produce a thing or keep my life support powered when ♥♥♥♥ hits the fan).

Sadly i dont know how to code or make 3D models, otherwise i would make it myself...