King Arthur, the king of mouse droids

[savagecreature]

One of the main reasons solar panels are almost always used in conjunction with chargeable batteries is the sun (or other full spectrum light sources) are unreliable. That is to say, what if you want to drive your droid at night? Or in a dark room? That's where the batteries come into play. Think of solar panels as a replacement for the generator, not a replacement for the batteries.