Seems to me that FWC caters to the boondocking crowd that prefers to spend vacation time away from civilization, so would have no way to charge it. As Ski suggested, if it can be charged via solar, that would work. Even if it took a few days sunshine to charge, that would work for me for some if not most of my camping. No idea if that is doable with current solar technology.
Truly boondocking in a solar powered vehicle assumes there is sunshine....sufficient sunshine to get you out of the boondocks. Even our FWC onboard batteries supported by solar sometimes necessitate running the vehicle motor.
Edited by Wallowa, 31 January 2020 - 11:31 PM.