Yes, I looked into a couple of solutions: Goal Zero Nomad 5 Solar Panel or the Biolite Solar panel 10, but these seemed a bit cumbersome. So i looked into this:
Trimm One
Regarding Dynohubs, This looks like a very useful piece of kit:
Dynohub
I've contemplated the issue of powering devices(Chromebook, Bike Nav, Phone and camera) on a multi-day tour and it seems there isn't really an ideal/easy solution.
That's a very different kettle of fish if you're talking about Touring!
I use a solar panel and a dynohub on long tours. The solar panel is for when I'm off the bike (I tend to stop a lot
) and is quite effective when stationary and well aligned.
The dynohub is to charge one of 2 powerbanks. The powerbank will be used to charge a phone, a kindle, possibly a tablet, possibly an i-pod and rechargeable batteries for lights and camera.
The problem with such a system is that it is inefficient (power is lost at each stage), but it works. I do not charge any device other than my Wahoo from the hub. I also minimise my power usage.
A chromebook, though, will likely require a large powerbank, if at all. When I researched this (a few years ago) there were only a handful of chromebooks that could be charged by USB.
On a 3 week trip from NL to Ireland and back I left on a full charge and only used my hub to recharge.
The reality is that for a lot of people on-bike charging is nice to have, not essential. Power banks can do just as good a job if your style is more .... "civilised"
Back to your original question, a gps unit, if it is for touring I would check very carefully on battery life and charge time. 8 hours to charge for 10 hours use? That's a no-no for touring in my book.
There's a lot of info on these boards about this subject. Use the search function and have a good read. I'd suggest trying to get a "big picture" view of the whole setup.
A phone and a camera? Most of my photos are taken on my phone. My camera barely gets used so battery life is hardly an issue.
Good luck!
