Using a Super-Cap

I have a project where I am thinking of using a super-cap as the power source. The super-cap would be connected to a 5v step-up regulator which in turn will be connected to this push button power switch ( ) When the power switch is activated my arduino will turn on and be able to turn itself off by sending a signal to the power switch. I was wondering what is the best way to make sure I don’t overcharge the super-cap, using a solar panel to charge it.

Since, no matter what, it’s just a capacitor, you can’t possibly overcharge a super cap…

Just make sure that you do not exceed the voltage rating of the cap.