Review on ECEEN 20W Solar Charger Portable Panel With 2 USB Outputs, Waterproof Foldable Phone Charger For Camping Survival Gear Emergnecy Kit, Tablet GPS IPhone Camera & USB Devices by Todd Calloway

This seems to work great. Will keep my phone at break-even on a partly cloudy day. Actually charges a bit in continuous sunlight. With 13W you won’t be charging your Tesla. You won’t like sitting in the kind of sunlight it needs, so get a small power bank and set it out to charge whilst you sit in the shade.On a cloudy day you are SOL, so plan that in.It seems simple and robust but I don’t trust it to withstand even the first drops of water from the sky. I don’t think it will work well hung from a backpack like all the ads show, and plus the flatland dork factor is off the charts if you do that. And if you take a tumble you will trash it or lose it. Plan on keeping it stowed most of the time and only charging under optimal conditions, during lunch eg.Even with this: Do not rely on your phone for your map and compass unless you want to die.