As one may know, Tesla Powerwall 2 comes in two versions: AC (with internal inverter) and DC. This question is about the DC version which comes with this coupling diagram:
We know that solar panels generate DC. So, on the diagram above, what does the hybrid inverter do with DC coming from the solar panel? Can the latter not be plugged into Powerwall directly?
Also, related question: if there was no grid involved (i.e. completely autonomous system), could the inverter be DC->AC only (not hybrid)?