Solar Phone Charger

There are a lot of them out there. Some are battery pack/Solar chargers (I suggest that type) The one I have depending on the level of sunlight can hit 6-7 Volts possibly more.... One device I have seems to "object" to this much charge.

Another option is a small (like 12 AH) LiFePo4 and a charge controller with a 100 watt panel (I have that too) Rather expensive but when the lights went out in my apartment.. the big inverter/battery pack kept the fridge cold and the little inverter/battery kept the freezer frozen (I have a small "Danfoss class" chest freezer) was very nice being able to keep things... cold.

Or I could use my Solar panel to charge a battery pack and use it to charge the other device.. in fact I think I'll try that.

This kind of charging uses so little power you could get a small inverter and just plug your current charger into that 120V plug.

What is the longest time/days you will be camping? How many charges do you expect of phones and camera batteries? 30000mAh portable chargers are cheap. 1-4 of them for under $100 may be enough to not rely on solar for 4-5 days. I recommend that approach. If you want extended charging for 2+ weeks, then I recommend a deep cycle battery for about $100 and a 12v solar charger to top off the portable USB chargers while not in use.