It takes some patience to charge the Power+ with the sun. Depending on the climate of the region that you live in, it can be more difficult to fully charge the WakaWaka Power+. The WakaWaka Power+ (product code WP22) takes 12 - 24 hours in direct sunlight to fully charge, depending on the intensity of the sun. The WakaWaka Power+ (s/n P02A) takes 18 hours in direct sunlight to fully charge.
The codes are on the hinges of the Power+
When charging the Power+ it is important that the sun shines directly on the solar panel. So please adjust the position of your device accordingly. When it is not that sunny or when your WakaWaka is behind (double) glazing, the charging efficiency decreases up to 70%.