Obviously a higher amperage equals a faster charge. As others have pointed out, the Volt doesn't care if it's more than 16A because that's the most it will ever need given the 3.3kW onboard charger. However if you're thinking of another EV it might be worth the extra capacity.I noticed that some level 2 - 240 volt chargers require 16amp, some 20amps and some even 40amps. What is the difference? Is it charging times?
I have been told if I was installing a brand new dedicated 240V line for a EV I should consider a minimum of a 30 amp circuit to future proof your investment. I will ask for two quotes one for a 30 amp and one for a 40 amp circuit.
When it comes to moving this much electricity through my house I subscribe to Big Daddy Don Garlit's mantra as it relates to HP - If SOME is GOOD and MORE is BETTER than TOO MUCH is just RIGHT.