If you are going to be in the wild for a day, two, or three the easiest thing to do is to bring more batteries. But if your plans take you to more remote locations beyond 3 days, you need to consider a solar charger. There are a few commercial solutions for common AA batteries as well as some solar panels that can be connected to the conventional 12V chargers.
If you are looking for a great commercial solution, check out one of these solutions:
- PowerFilm offers a couple of solutions:4 AA Solar Charger12V Universal Rollable Solar Panels
- Brunton SolarRoll 14
- Or checkout more expensive solutions sold through B&H here
For more information on putting together your own DIY solution, check out an article at ModernOutpost.com here.
For more information on USA sun exposure, take a look at the sun exposure map here.