First determine the voltage and current of the solar panel you currently have
The direct input of a cell phone is generally 5V1A. Some mobile phones and tablets can input 5V2A.
If you have a large battery panel, you should reduce the voltage to around 5V and the current to less than 1A.
Small battery panels should be connected in series and parallel to increase the voltage and current to a suitable range!
Please adopt! ! !
The voltage is too low to charge. If you charge your phone directly with a solar panel, it should be at least 5V. Since solar power is affected by changes in light intensity, it is best to choose one. solar panel with about 6V. Besides voltage, current factors must also be considered. If the current is too low, some telephonesPortable ones cannot be charged, especially smartphones. If you do it yourself, it is better to choose a foldable solar charging bag, available in 5W, 7W, 10W, 14W and other wattages. The higher the power, the higher the current and the faster the charging speed.