Can a remote switch be installed on the solar powered fan like an on/off wall switch?

Here is some guidance regarding adding an on/off switch to a solar powered fan.

Since the solar fan is not UL listed, it's possible to modify the unit. A switch to interrupt the power flow to the motor will not hurt the solar panel. Air Vent does not have how-to installation instructions. Check  local electrical codes to learn the step-by-step process and to make sure all of the wiring is okay.