On Saturday, my wife is going to test drive a Model X. This will be for her car and not mine as I already have a reservation in for the Model 3. This will be our first time ever in a Tesla actually. Depending on how it goes, we might be placing an order for one. Though, who am I kidding... I don't really see her not liking it. One of the steps that I was planning on doing down the line for the Model 3 was to get 100 amps to the garage for charging. I feel this will suffice for 2 EV's with the HPWC power sharing feature. Our house has a 150A breakerbox and it is completely maxed out. My question is how an electrician will get 100A to the garage? Will the main breakerbox have to be upgraded to 250A-300A (in order to install a 100A breaker for the garage) or can the original 150A breakerbox be kept and a second 100A breakerbox be installed in the garage? I'm just curious if I "HAVE" to route the power through the main breakerbox due to some code or something. I know this can vary from state-to-state (I'm in VA).