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I don't have a solar battery charger, but I did just pick up one of these Zero Goal Nomad 13 solar panels along with the Sherpa 50
It was about $300 for both, a bit expensive if you ask me. I need it for my 2 week road trip through Iceland, I'm going to have a lot of extra batteries but I will also need something to charge them with, which I think this should do the job. I still need a DC power based charger for the battery, perhaps something off ebay will be fine.