My guess would have been strain relief if something tripped over the wire and pulled on it. Instead of putting pressure on the port on the car, it will instead put pressure on the knot by the tire.
But looking at the other answers I guess I was wrong lol.
Can confirm. Mine will take about 3 days to charge from very low to full on a regular wall outlet. Still worth it sometimes though, like when I'm visiting family or camping or something. If I'm gonna spend the day somewhere (like 6+ hours, let's say) it might be worth it.
that's a first-gen chevy volt from 2012-2013. it can't fast-charge at all, it's limited to line voltage only. a full charge takes five hours, give or take. thankfully it's a hybrid.
There are 3 charging levels. 1 is basically just "plug your car into a wall outlet". 2 is more powerful, and usually involves installing a little charging box with a cable, but it's still AC and fairly slow. 3 is the DC fast charging that operates at crazy high voltages and currents.
I changed off a 12v 20amp outlet for over a year at my house till the charger was installed. It would take 12 hours to charge from empty to full but never had that happen except going on trips, then I would use the DC charging stations.