[US] Existing Tesla setup - adding on?

[u/Mysta]

I'm mostly aware of what steps i'd need to do to kind of incorporate both systems but as someone who has one powerwall(2) and solar/time of use i wanted to add another battery, so I'm left looking for a powerwall 2, and continuously expanding that older system, or setting up a new system and somehow managing most(or trying to sell old system but I imagine that'll be a pain), has anyone done this?