Thanks for that!

Adding in wiring and electronics for conversion, the overall weight difference for battery + solar panel is likely to be very small when compared to the dynamo setup but yet more flexible because it doesn’t depend on motion of the bike.

I also have a tiny 45W GaN based USB-C power supply that also works very well for charging that battery at the full 45W charge rate. So if the Omnicharge battery is completely flat, it would charge to 100% in less than two hours. A day’s usage of 35WH would be about 45 minutes of charging with that charger.

I think that the convergence of GaN power electronics, USB-C PD batteries, improved efficiency of solar panels, and USB-C PD charging makes for a lot of options that weren’t available even a year or two ago.