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Solar chargers do not make sense from a price or weight perspective, unless you are taking an extended trek (2 plus weeks). At that point, you'll probably have resupply stops anyway, so they still don't make sense. Whatever small electronic device you're trying to use, whether it's a phone or a camera, you can pack three or four spare batteries for the weight of a solar charger. You can also swap a fully charged battery in seconds, as opposed to 8 hours for most of these smaller solar chargers.
I use the camera on my nexus 5 because I'm addicted to photospheres (but this will be coming soon) and that battery isn't swappable. I think the weight and performance arguments are going to beat out my gadget love though.