When I plug in our new Model S into an older HPWC (no side dock) it sometimes says 0/47A and sometimes 0/48A, and then it proceeds to that max number. Sometimes the max changes while charging too. Is this normal, or is it an indication of a problem? What does your say when plugged into an HPWC with sufficient capacity to max out the onboard charger? Does it consistently display the max spec number or does it show lower?