The speed of solar charging depends on three points: the type of solar panel, the area of the solar panel, and the strength of the sunlight. Among these three points, the strength of the sun is not what we can't control. When the type of solar panels is determined, the area of the solar panels is important. At present, some e-commerce platforms have some solar charging treasures, which is to add a small solar panel to the charging treasure. In fact, due to its small area, the solar solar power is relatively small, generally only 1- About 1.5W, for such a small solar panel, the current generated by it is very limited. In the case of sufficient sunlight, it generally only produces a small current of about 0.1-0.2A. Such a small current is actually not enough. The power of the mobile phone during standby needs to be charged. If you use such a small current to charge, it will take more than 30 hours to fill a mobile phone with a 3000mAh battery capacity! Calculated by the effective daily sunlight for 8 hours, it takes 4 days to fill! Such a solar charging treasure can only be used as an emergency. The battery that is actually charging the mobile phone or the solar charging treasure is working, so for those who want to pursue the true solar charging effect and speed, this does not have to be considered.