question

You will have to use the second multiplus independent from the other, you can not connect them both to the same cerbo gx

Maybe option is to use a multiplus 2 GX

Dont know about DC wiring also, charger multi is going to feed multi thats powering the loads, maybe there needs to be a victron isolated DC - DC converter inbetween to make it work

I have installed the second Multiplus with grid code other and connected it via an MK3-USB interface. A MK2-USB interface is not supported.

The Cerbo recognises the second Multiplus and lists it in the device list, but it does not appear in the dashboard diagram. The power figures in the dashboard diagram do not add up correctly as the excess power from the generator is not accounted for.

There is full support under node-RED. Here is a screen shot showing the generator details:

Addition:

I have built a new dashboard that takes the generator input and the critical loads on the second Multiplus into account. I have also added in the Eskom-se-push to set the Minimum SoC based on the load shedding stage:

Para tener informacion de la carga en el GX se deberia poner un smartshunt en el nuevo multiplus. Como si fuese un cargador de otra marca.

You might not need to have the cerbo connected to the second multiplus, if you enable "has dc system" in the cerbo and if you have a shunt connected to the cerbo, then the second multiplus charge current will be recognised as an external charger and will be taken account of and displayed in the DC system box.

This is completely unsupported. The systems cannot share a common battery. The GX will only manage one inverter.

Cascading inverters is done, but they are independent systems, but it is still unsupported.

Freedom Won are likely to end your warranty as well, having a charger that is not managed by DVCC.

From the GX manual:

Only one VE.Bus system can be connected to the VE.Bus ports on the back of the Cerbo GX. The professional way to to monitor more systems is to add a second Cerbo GX

If you do require to connect more than one system to the same Cerbo GX, use an MK3-USB. Functionality will be limited:

• Only the system connected to the built-in VE.Bus ports is used to generate the data on the Overview pages.

• All connected systems will be visible on the Device List.

• All connected systems will be taken into account for Energy consumption and distribution calculations (kWh graphs on VRM).

• Only the system connected to the built-in VE.Bus ports is used for the Generator start/stop logic.

• 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.

• In case of an ESS system, only the system connected to the built-in VE.Bus ports is used in the ESS mechanisms. The other one is displayed in the Device List only.