As the OP, this is basically what I am asking.
Technically if it's able to handle 240v right out the box, then basically you can charge twice as fast as level 1 and 2/3 of the level 2 charging speed for the Spark.
240v x 8a = 1.92 kw
240v x 12a = 2.88 kw
However, if you wanna be safe, then...