Perhaps it depends on region or perhaps you're referring to driving plugs outside of standard? Where I am a normal plug can drive around 3kw while a dedicated

Perhaps it depends on region or perhaps you're referring to driving plugs outside of standard? Where I am a normal plug can drive around 3kw while a dedicated circuit drives about 7kw (both for single phase, more for 3 phase). When we had the dedicated circuit fitted it needed to sense the load from the rest of the house so it could dynamically back off to stay within our overall safe limits. Obviously I'm not saying that putting a box around something magically makes it better, I'm saying that something that plugs into a standard domestic plug (which is what I thought you were taking about) will not supply power at the same rate and that difference can be significant for charging times.