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hm, interesting. I don't know this solar-log. I'm boing to be in Viessmann office here in Czech next Monday, so I will ask somebody from service department regarding this issue. ... Mehr anzeigen

@qwert089 the MPPT is connected directly to batteries, so there is no place to install the second smart meter. I will try to disconnect the second smart meter and keep only the first one. ... Mehr anzeigen

@qwert089 Hello, there are 2 goals: to show the correct data in energy managemnet in ViCare app for the customer to use the maximum of the energy from PV Everything is connected to AC Out as critical load. So if there is a power failure from the Grid, everything can run on batteries including the heat pump.   Personally I have a Vitocal 200 with WO1C in my house, I also have Victron and everything on AC Out (including the Vitocal), however, the WO1C need only 1 smart meter. The new One Base regulation needs 2 of them, which is quite tricky.  ... Mehr anzeigen

@Flo_Schneider Hi, thanks for the reply. Yes, I know that there should be 2 energy meters. I have both of them. The problem is where to install them.  The first energy meter is located on the main connection point. That is no problem. The problem is the second energy meter. In the schematic from Viessmann, the schema is: main connection energy meter 1 Heat pump (and the rest of the house) energy meter 2 PV inverter However, the customer has the schema different: main connection - OK energy meter 1 - OK PV inverter Victron - that is different from the Viessmann schematic possibly energy meter 2 Heat pump and the rest of the house. So in this kind of set up: the energy management doesn't show any PV in ViCare app it shows 2x the energy consumption when there is no sun (only power from the grid) it doesn't show any data in energy management when the house and heat pump are fed by the PV You can see the difference in the pictures I posted before. ... Mehr anzeigen