Yes, solar panels do work indoors! It doesn’t happen often, but time to time you still have power outages in Chile. I experienced them in all parts of the country. In the beautiful capital Santiago, in Valdivia and all the way south to Coyhaique. It is always very short, never more than an hour, but sometimes unexpected and sometimes a little annoying. Since I am prepared for wild camping during this crazy adventure, I always have power bank or two just in case. Today we had power outage in Coyhaique. I decided to try my solar panels indoors rather than using power banks. Not that I was desperate, but I just wanted to try as the sky was clear and the sun was shining directly trough my window.
It worked better that I was expecting and my kindle was charging pretty fast!