Solar charged usb power-bank

When your on the beach all day in the summer with your bluetooth speaker streaming some tunes through your phone. Even if you bring your power bank it will still always run out. And seen as your sat out in the hot sun all day then why not use it to your advantage (other than working on your i mean). So here you go, make one of these and say no to no battery life while your on the beach. Have Fun (work in progress, pending under side and photos of it functional.