The solar panel is a bit iffy. I recently attempted to start a tour on the west coast in WA and OR using a very large solar panel that was to charge up a battery pack to power a C-PAP device. The panel was flexible enough to drape over my BOB trailer but because of cloudy, rainy and heavy woods, I was not able to get more than two or three hours run time on my C-PAP. The panel measured 21"x 30". Maybe it would have worked better east of the coastal mountains.
Definitely, not a fair comparison for a solar panel to charge that type of battery. That being said, I quit using the C-Pap and went with a TAP3 mouth piece and have not looked back since. Works great (ask my wife) and since it is similar to a mouth guard, no need to worry about batteries, hoses, noise, etc from a CPAP machine. Also, the Goal Zero products worked great for me in keeping the battery packs charged, which in turn then charged the iPhone, Garmin at night while sleeping.