The E1600 solar bank is compatible with the Anker Solar C1000X. Both devices operate with a voltage of 60 V and can be connected to each other via the corresponding connections.
You can connect a module to each battery and then use one side of the inverter or 2 inverters at the output. So far I have understood what they write on the website.
How does Zendure do it exactly?
It is possible as long as you stay within the specifications, no guarantee comes from my memory: 11 to 60V and 30A. In other words, you can connect several modules in series and make two strings, so to speak, because there are two inputs.