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Additional info: The MC120, unlike the MC240 (or Martin's special MC240) and the HPC, does not have a "pilot signal" to communicate its capability to the car. So when the car (the charger in the car) senses 120V it automatically assumes it's dealing with an MC120 plugged into the more common 15A capable house wiring, de-rates to 80% of that = 12A. As stated, you can adjust current only on the VDS (not Voltage). So the trick with the MC120 is that you can set it to 16A (being a discrete value, 15A or other numbers are not available ... according to the manual the discrete values available are: 12, 16, 24, 32, 40, 48, 60, 70). It is unclear to me why the car limits the MC120 to 15A when 16A is really the chosen value *AND* 16A being de-rated 80% of the common 20A breaker. Anyway ... if 15A is all that's being drawn from (possibly) multiple outlets on the same 20A breaker you'll be ok. The MC240 has intelligence so it tells the car how much current it can supply, and ( I believe ) the VDS is smart enough to lock out current choices above the maximum communicated via the pilot signal from the MC or HPC (which with some re-configuration can be set to output less than 70A). For the MC120 choices above 16A are locked out. (Note: the old HPC had a user accessible dial to change maximum output. The new ClipperCreek unit does not -- it needs to be configured by Tesla or ClipperCreek.)
Stuart has a point. Even though many (?most) houses use 20A breakers they are being used in conjunction with 5-15 receptacles (outlets). So you should not continuously draw 15A from a single receptacle (which usually comes in a dual outlet configuration) -- even though that's their rating (with hopefully some conservative slack built-in). That's the code anyway. But the question should be asked, then why do you frequently find wiring rated for only 15A from the multiple receptacles back to the single 20A breaker -- drawing even 8A each continuously from two different receptacles won't trip the breaker, but you are sharing the 15A rated wire all the way to the panel ?
But the question should be asked, then why do you frequently find wiring rated for only 15A from the multiple receptacles back to the single 20A breaker -- drawing even 8A each continuously from two different receptacles won't trip the breaker, but you are sharing the 15A rated wire all the way to the panel ?