Solar panels and chargers do work indoors. They will still produce power through a window even if there is no sun, although a reduced amount. This could obviously lead to efficiency issues, which is what I want to investigate and test out in what follows. The question I'm trying to find an answer to today is: Do. . Can solar panels work from indoor lighting? The answer is yes, but there are a few things to keep in mind. The charge controller regulates. .