We just put down the deposit for a Model S 90D, so excited! Started looking at home charger installs and wanted to get an ideal of how much we should expect to install a HPWC. We have a 220 amps electrical system already, assuming minimal distance between the electrical panel and where the charger will be installed, charger will be installed outdoors. What can we expect? I have heard of the "Tesla tax", should I be asking for a quote to install a NEMA 14-50? Is there any difference from the electrician's perspective when installing a HPWC vs. a NEMA 14-50? Also, is there a permit required if I'm not upgrading our electrical system? Thanks!