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standby small
It is no coincidence that the PW is a 350-400 Vdc battery (sound familiar???). If it were going to play nicely with existing inverter technology, it would have been 48 Vdc (see WK's threads on using an MS battery for his home solar system).
We know the power connector on MS supports direct DC access to the battery (SuperCharging) so there is no reason to think the power can not go the other direction.
What we need is a smart inverter that can (1) switch the grid to house on and off seamlessly, (2) manage the PV array at MPT while sending the excess DC to the battery directly needing only a small buck/boost circuit, (3) the ability to manage both a stationary battery and a MS in parallel and (4) the communications necessary to get the MS to play along.
This is exactly how Musk/Tesla does stuff. He is using the car company to fund the battery building to take on carbon on the road and at the utility.
When you think they are selling a 10kwh battery, they have decided it does not need to be that big in KwH to be big in impact.
Why would I want to put more cycles on the battery in the car than I have to, or run the risk of having less charge in the car when I want to run out than I expected?
Also, during the day the car isn't in the garage, and at night it's charging. My car is in exactly the wrong place at the wrong times for any kind of solar load shifting or grid demand arbitrage.
I think the real reason there is no (released) vehicle-to-grid is that they want to manage perceptions. If the battery life is great for just driving, then they want those great impressions for the brand and EV's. If driving+daily cycling is much worse for battery life they would prefer not to mess with it. This is my feeling. Better to sell a separate $3k device special built for that.