When you see this under the pricing section on a website you know you're about to get effed in the A.
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Today's Chinese LFe batteries and Deye, Sunsynk etc. inverters are so damn good in general that no-one really needs this unless you're very concerned with aesthetics and bragging rights, I guess.
Integrating the inverter with the battery pack just always seems like a bad idea to me, if it wasn't there'd be more Chinese competition in this space by now.
I've never seen the Tesla power wall app but I'd be surprised if it provides better functionality and monitoring than a decent inverter with Solar Assistant integration... granted, the Tesla stuff will be way more "Apple" like in ease of use and aesthetics.
Also, it seems the Home Assistant integration options with the thing is pretty lame in terms of actually controlling the inverter.
Instructions on how to integrate Tesla Power Walls into Home Assistant.
www.home-assistant.io
"Powerwall 3 also boasts a Storm Watch feature that can prepare homes for outages based on severe weather predictions.
When a potential event is detected, the battery will charge up to prevent a home from being left without electricity if the grid supply gets cut off."
hehe, it solves a first-world problem, how quaint.