Tesla has said that their stationary storage batteries are less energy dense than automotive. So that means more material weight and volume per kWh, but we don't know if that also means materials at a lower level of refinement, or if they are just sacrificing some energy density for durability. I suspect a bit of both.
Aha, thank you! Honestly I'm actually thinking about this as a way to diversify and at the same time use the knowledge of the upcoming trends. The way it looks to me is the market entry barrier to stationary storage is WAY lower than automotive. It boils down to batteries which I'll assume will become a low margin commodity market once production capacity gets built, and some electronics/software. So I'm going to speculate that there's a medium term opportunity before the market gets saturated, or disrupted by a battery technology break-through which will throw all this out the window (not that unlikely to happen). Electronics and software for grid support seems to actually be a somewhat safer investment. I so far haven't been successful in identifying any investment opportunities though.