Here is a solar charger that combines with your beach chair to hold and charge your smartphone with sunlight. The SunTray Solar Charger Side Table easily connects to your chair and has 2 USB ports. It also has a non-slip surface to hold your gadget.
This solar charger snaps on-off your beach chair without a whole lot of effort. It has a 360 swivel bracket to fit most folding chairs. It measures 14 x 8″.