Optimal solar charge experience can be obtained by :- opening the Photon completely towards the sun- no shading on any of the solar cells- tilting the Photon perpendicularly to the sun- static conditions. Hanging the Photon on your backpack whilst hiking is a handy charging solution but will reduce the charging speed as the Photon will move and the solar exposure will fluctuate a lot.- perfect sun conditions (summer time, no clouds, +-15°C)- not placing the Photon behind a window (this can reduce the solar charging speed up to 90%)- allowing ventilation around the product in order to keep the temperature low (high temperatures affect the efficiency of the solar cells)