Folding solar panels with output voltage of 5v and power of 10w (the area of solar panels is equivalent to the size of two iPad) are placed on the balcony at home. On the premise of fine weather, it takes about a week to fill the Xiaomi charging treasure with the capacity of 10400mAh, so the actual charging efficiency of solar panels is not high.
The correlation is as follows
If the solar cell is designed in the back shell of the mobile phone, it can be used to charge the mobile phone in theory, but on the one hand, the small surface area of the back shell of the mobile phone determines its charging ability is very limited. On the other hand, the voltage and current output by solar panels to indoor artificial light sources such as fluorescent lamps and LED lamps are almost zero, which also limits the applicable scenarios of solar charging.
The history of solar cell phones is interesting, but it looks boring because there are few breakthroughs.
Samsung was the first manufacturer to market solar cell phones, which was in 2009. This model named "Solar Master" was mainly sold to the Indian market in response to the frequent large-scale power outages in India at that time. However, due to the limited technology, the solar charging efficiency of this machine is terrible, charging 1 hour and talking 10 minute.