I recently bought one of these http://www.goalzero.com/p/11/nomad-7-solar-panel with the Guide Ten Plus battery for a long trip (having done a bit of research and got a recommendation on here). I was very happy with it for camera battery and sat phone recharging. Not sure about the quadcopter, but Goal zero do beefier versions.
get the biggest goal zero you can afford. Alternatively if you don't have to worry about weight you can get more power than they GZ products can offer by getting solar panels designed for sailing boats, lead acid batteries etc. It'll weight a tonne though
+1 for the goal zero kit. I also have the nomad 7 with the plus ten charger, but you can get a panel twice that size for quicker charging and bigger battery units. Not cheap, but the cheap stuff doesn't work.
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Press Release Arc'teryx Climb Academy returns to the Lake District: May 25th – 27th
News Lorraine McCall Starts Grahams Round
Lorraine McCall began her attempt today at a continuous, self-powered round of the Grahams, a four-month tour of upland Scotland combining walking and bikepacking. If successful, she'll be the first person that we know of to do it.