Is it possible to install a separate Multiplus just for Generator input on existing ESS system?

12.3.1. DVCC effects when there is more than one Multi/Quattro connected

Only the Multi/Quattro (which can be a single device, or multiple together configured for three-/split-phase as well as parallel) connected to the VE.Bus port will be controlled via DVCC. Additional systems, connected to the GX device using an MK3-USB, are not controlled by DVCC and will charge and discharge according to the configuration made in those units.

This applies to all types of systems with DVCC enabled. For example a system that does not include a managed (CAN-Bus) battery, and uses only the DVCC charge current limit: that charge current limit is only applied to the Multi or Quattro connected to the VE.Bus port.

The second Mp via MK3 works as charger only

sorry the search topic is flatpack