Check the correct horizontal and vertical angles of your solar panel and orientation, of course
If not enough power input, try overpaneling
To increase the charging range, install a capacitor as described
Yesterday, i just bought a capacitor and installed it on my cable, close to the powerstation.
Now, i can charge longer and better ; in low light and more W in input
@DaterTheAndroid I’m sorry there is no suitable firmware. In addition to the input voltage, it also depends on whether there is current. If the sunlight is too bad, the solar panel has almost no current input to the machine, and it will not charge the EB3A.