lots of bad actors out there.
Google the potential buyer by name. Check linked in. Check social media.
Ask for a picture of driver’s license with photo and address visible. Do your due diligence
If you see any red flags and or can’t verify identity or encounter any pushback, don’t engage.
It would also be helpful to have a friend or a neighbor over at your place during the visit even if everything checks out.
There’s still no guarantee that this person is a serious buyer even if everything checks out. He might just be interested in hearing your system and not buy anything. You’d be wasting your time.