Some of the 30amp J1772 chargers I have seen are not 7.2 kW or even 6.6kW, they are actually only 6.0kW because instead of being 30amps @ 240volts, they are hooked up to 208 volts. However there is so much voltage drop to the unit that they really only deliver 200 or 201 volts - thus 6.0kW. If you plugged a Model S with the single 10kW charger into a real 20kW HPC ( 240 volts 80 amps max ) - then you can draw 9.6kW by pulling 40 amps @ 240 volts. However if it is a 208 volt unit with a lot of voltage drop - then 40amps @ 200volts is only 8.0kW. Thus my question - can you dial the amps up to 48 amps so that you have 48amps @ 200 volts which is 9.6kW? Even if it was a full 208volts, 48amps would be 9.98kW just barely under 10kW.