Did you not talk with them about potentially where your want the powerwall during the physical site assessment early in the order process? By default they will try to place it close to the gateway is possible, less wiring for them so easier, if that's the case it's fairly short. I ask mine too be in the garage opposite side of the house.Thanks for the info. You are correct about the Gateway. I thought you didn't need a Gateway with Powerwall + . As far as the wire sizing it might be an issue because at this time I'm not sure how far away the gateway is going to be from the powerwalls. I'll also need to check my existing drop to see the size. Here is a image from Tesla's ordering page that shows a 4 powerwall + configuration. What's interesting is that the picture changes as you edit the number of powerwalls. Thanks again.
The gateway can be many factor
1) has the local city and utility approved the back up switch?
2) does your main panel bus bar support the extra current after the normal house load? Most max out around 225a
3) does your panel enough breaker space? You need like 4x double pole breaker. The gateway has an optional breaker panel that allow them to tap the service drop instead of adding breaker to your panel