Successfully scaling down a real spacecraft power system to a usable size, especially in an indoor environment is a difficult obstacle to overcome. Through testing and evaluation of example circuits and various solar cell options, as well as reviewing other users discoveries has left us with a renewed interest in incorporating solar energy harvesting as a viable option for the Cosmoneer.
Back in 2013 when the Cosmoneer idea was beginning to take shape, Solar energy as a power source was the focus for nearly 6 months. Four years later, we believe we can incorporate ideas presented by others on the internet as a means to successfully power the Cosmoneer (albeit intermittently.)
In this video, Shahriar shares his demonstration of the LTC3105 energy harvesting chip and suggests using two of them in series with a super capacitor in-between. What he demonstrates is the second circuit harvesting as much usable power as possible from the super capacitor.https://youtu.be/lrELRVFEx_s
(from Shahriar's blog post, here: http://thesignalpath.com/blogs/2013/01/03/tutorial-and-experiments-on-energy-harvesting-ics/
As with all things Cosmoneer, the idea is to constrain the Cosmoneer to problems faced by typical spacecraft, only on a smaller scale.