Nice…
If we were to guess, some bidirectional DC / DC converters.
Or the hardware of a Multi RS with an additional bidirectional high voltage DC/DC converter, in order to bring the HV DC from the car onto the Multi RS DC bus.
For the beginning and show, only an Multi RS with the battery part adapted for high voltage of the car battery.
The high frequency transformer inside will have different size windings, besides different input capacitors.
This way the VRM is already suited to show all the info.
Of course a high frequency thing… Sorry low frequency toroidal lovers… 
A complete thing will look something like this, below, in order to have the possibility to charge the car from house battery or vice-versa, charge house battery from car, or both from solar, or whatever combination.
Let’s see how long from this to production/selling, as the HS19 is waited…
Or don’t tell me that’s an HS19 with some small added hardware and/or software to talk, in its “native language”, to the car’s battery, instead to a HV battery… Because the car’s battery is also a HV battery.
