Solar radiation increases with sunrise and peaks around noon.
We recommend charging the device over several days, using the time frames indicated on the right as a guide.
Even during optimal times, charging may take longer depending on the season and weather conditions (if not clear skies).

Solar irradiation time and amount are longer and greater in spring/summer than in autumn/winter. The amount of charge also depends on the angle at which direct sunlight hits the panel. Please try to ensure sunlight hits the panel as directly as possible. If stored after charging, approximately 60% of the charge will remain after one year, but as a maintenance measure, periodically expose it to sunlight to charge it.

The sun is constantly moving, so please be careful not to let the solar panel be shaded. Even on a clear day, sunlight reflects off window glass, so charging through a window will take a long time. The estimated time to fully charge from a zero state under direct sunlight is 7-9 hours. *Do not leave or charge the device in high-temperature places such as inside a car. *Please turn off the light when charging.