In exploring the low voltage front, I have a circuit which can boost from 0.7v up to 2.67v. I have another circuit which can boost from 0.25v up to 1v. So, that gives me a path for getting from 0.25v up to 2.67v. The trouble is, booth need to first charge a capacitor to at least that voltage, or else the converter just spins its wheels and does nothing because of insufficient current. I can probably manage that with the first one, but I don't see a way to detect the state of capacitor charge at 0.25v or switch on the 0.25v converter at such a low voltage in a cold start scenario. So, if anyone has suggestions on how to approach that.... If 0.25v is too low to manage, how low can voltages go and still be manageable?
[Edit: Anyhow, even without a boost circuit but just hooking up a number of mini solar panels in series, I bet I could run a Moteino off of mere moonlight, which would be pretty cool. In the end, that may be a great application for Solar Bits, since they're so compact that the series of panels wouldn't be awkwardly large. Because of their relatively cost, though, having a viable boost circuit would be cheaper than stringing a bunch of them together. ]