The outlet and adapter approach certainly can save money, and still charge plenty fast, but there are some advantages to the Wall Charger that I like.
* It can be adjusted to run on any 240V circuit from 15 amp up to 60 amp as shown in the table below from the Gen 3 Installation Manual linked above
* Since the unit is hard wired and contains internal GFCI circuitry it does not require an external GFCI breaker.
* It does not require a receptacle to be installed, so there is no issue of having to match the proper receptacle to the circuit.
* No neutral wire is required, so basic 2 conductor with ground (cheaper) is adequate.
All this together means that if you install the WC with 6/2 wire you have a universal and future proof setup that can be served by any breaker your electrician determines is right for your load center. And if you make improvements in the future or rebalance your loads all that is necessary is to swap the WC breaker and reprogram its current draw.
Curiously, I also noticed that according to Tesla the use of an external disconnect switch is neither required nor recommended, even at 60 amps. (See Note below)
I can understand it not being required, but does anyone know why it is not recommended?
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