Hello, Im planing on building a three phase 9kW solar powerplant on my house roof. It is an older house so there is TN-C electric instalation in it (meaning that one phase grid inside the house is wired with two wires (common N and GND) and three phase with four wires). My idea of dealing with the wiring was to connect GND and N on the input to the same wire(remmember, there are four wires, L1,L2,L3 and N) and then leaving the output GND unconnected. Originally, I planed to use 3x Multiplus II 48V 3000W, but recently I spoke about it with one of the Victron dealers in Czech Republic and they told me that Multiplus II cant operate in TN-C grid from their experience, but that Multiplus can do it. Can somebody confirm this claim and explain how is it possible? They werent really helpful with the details, or they maybe didnt even know them. I just cant imagine how can Multiplus II recognise that the output GND is not connected and more importantly why should it be a problem. Thank you for the answers!