1.Solarpanel can not store electricity directly. you need a power bank to store energy. It can be directly connected to your devices to charge them.
2. The efficiency depends on the weather and the strength of the suns rays.
3. Smartphones and power bank should not be kept under direct sunlight as it may cause overheating.
4. 30W refers to the maximum power of DC port, not the total output power of the USB outputs. A small amount of solar energy is lost during conversion to electrical energy. Thus, the actual output power is less than 30W.
5.The solar panel only functions as a one-way power output; it does not receive power consumption and will not discharge your electronic device when connected to it!
6.Do not use solar panels behind glass, especially behind UV-blocking glass.