Just a quick GoogleIt gives me Growatt, PowMr, SunGold, PVinvt, EG4 and a bunch of others who have solar hybrid inverters in the 5000 to 10000 Watt range for about $1000.
I have two different solar hybrid inverters on my two houses here which will take 400v input, feed the grid and/or house. These are currently connected to solar strings but they could also be connected to 400v car batteries and be happy. These inverters are installed to feed excess solar to the grid and house and also provide backup power to the house in the case of grid failure. They have their own 48 volt batteries which could be recharged from the 400v car battery.
The CT Powershare should be able to provide 400v from the car battery to the inverters. Shouldn't even need a switch/gateway outside of the CT. Ideally all you would need to do would be to plug a NACS connector into the CT and tell it to turn on the battery power which would go to the inverter.
So all you really need is a cable to the inverter.
TFA makes it sound like there is a lot more hardware and wiring involved but this seems to make it more complicated.
Really, just a cable to a hybrid inverter solar string input is all that you need.