In reply to Flinticus:
Same as others, I have a panel and powerbank for family camping, all Anker. In reality, the power is from the banks and the solar panel just keeps them topped up (-ish).
With good charging management (don't charge to 100%, don't leave your phone on charge overnight etc, charge in car when possible) we could probably do without the panel but with quite a few devices (watch, 2 of phones, walkie talkies (these get hammered by the kids), camera, torch, lamps etc and the fact getting my wife to adhere to my "charging rules" is a lost cause, it helps to top up from the panels.
If I pick a decent overall position/angle fore the panels, the banks are normally back to full charge after a day out and about.