A) This question arises when you find a charger which has the features you want, the rated power is exceeding your circuit's capacity. In that case, if the power exceeds 80% of the circuit capacity, the charging station must have the ability to adjust and lower the current.
Many people suggest oversizing with current adjustability as it tends to offer more durability. Fr example, if you are using a 40 amps charging station only at 15 amps, it’s more likely to last longer.