The charging time of the batteries varies depending on the product, among other things depending on the dimensioning of the solar module. Please refer to the corresponding information in the operating instructions. A full charge of the battery will usually require several days in full sun. The charging of the battery depends on, 1. the maximum hours of sunshine available per day 2. the geographical location (the further south you are, the more hours of sunshine are available on average) 3. the time of year, in the winter months, the charging time can be significantly longer, as the sun no longer hits the solar module optimally and the hours of sunshine decrease. 4. the weather, as soon as it is cloudy, the charging performance of the solar module decreases, since cloudiness is equivalent to shading.