Neither of those: the in - and out- are high voltage DC (~350V ?), presumably just at the battery string voltage. You have to have an inverter to get AC of any flavor.
Most solar inverters will work with that current from the batteries, but combining it with solar PV is more difficult because the panel string voltage varies by nearly 50% depending on irradiance.
SolarEdge is the company that has products best suited to integrating PowerWall, and they say a software upgrade for the inverter will make their products installed in the last 2 years compatible.
pv-tech.org is an industry website that's pleasingly devoid of hype.