Hmm, I live in the foothill with mountains all around. We were thinking of getting some, we will take that into consideration. I wonder if any can be charged with a solar battery charger.
You need a 12VDC (car battery) to 110VAC power inverter. They typically run from about $25 to $100, and have a multitude of uses for lower power consumption apps like recharging other batteries.
Thus you would have a set up in which solar panels recharge car batteries over the course of a week or two, that when fully charged could be used to charge hand held devices of all varieties.
I might add that in troubled times, you would want to use walkie-talkies very discreetly, using different frequencies at irregular intervals, and alphanumeric “one use codes”, to keep xmissions short and secret. Never in the clear and with no extra chatter.
For example, “Bravo X-Ray Delta” (nul) (nul) (radio check), to which the proper response would be “Delta Mike Quebec” (nul) (radio check) (nul), on frequency 3, which is valid from 9:15am to 11:20am, then shifts to frequency 7 from 11:20am to 4:50pm.