I come here because I have just installed an MultiPlus II for doinf ees.
My installation is :
MultiPlus II GX + 1 ET112 for metering PV production (USB connected to the MPII + an external current sensor connected to the Current-sensor input of the MPII (measuring the current of the main input grid phase)
System :ESS
Grid connexion : 6kVa
PV installation : 6kW connected on the only ac-input of my MPII
Loads:
- two electrical vehicule plugs connected directly to grid line (before the MPII)
- all remaining loads on the AC-ouput-1 of the MPII
Battery : 7.2 kWh Pylontech US2000C batteries
Sensing : two current sensors wired on an Shelly Pro EM energy meter (one measuring the current of the main input grid phase and one measuring the AC-ouput-1 of the MPII
Fisrt of all, everything seems to work properly, grid feed if solar production to small for the loads. If small load and PV production → Battery charging. If no solar production and battery above SoC → bateery ffeds the loads.
But The reporting on the VRM portal or the local interface is strange :
- my PV inverter is shown on the load side (whereas I have configured the Et112 as an PV inverter meter on the ac-input-1)
- the consuption of the grid is totally stange. Indeed, the main wattage indication is completely diffrent from the one that my shelly reports and from the actual load consumption. But the load reported for the L1 line is correct (for example, wattage grid -2414W and L1 wattage -177W. Notice that -177W corresponds almost to the active power reported by my shelly pro and -2414W corresponds almost
Bonus question : why on the energy meter configuration panel for the position there is AC-input-1, AC-input-2 and AC-output whereas actually my MPII have one AC-input and two AC-ouput. It seems inverted.
The picture I give is when my total load (on AC-in and Ac-out) were around 2300W (1800W on AC-In 8A electric vehicule charge) and 500W classical load on AC-out-1).
I would like someone to confirme that putting “external control” in VeConfig for the grid metering and “inverter/charger” in ESS config in the lan console wil not provoke bad behavoir.
AND could telling VRM that the inverter is on AC-out instead of ac-in be an issue ? (Note that the position of my inverter has not moved on the VRM sisualization…)
The sum of Wattages is inconsistent (impossible)
In the attached example I have 1925W comming in from Solar, and 1802W consumption + 523W of charge into the batteries. So about 400W of “consumption” is comming from “nowhere”…
But on the other hand, a few seconds later I have a negative value into my batteries (discharging I suppose). But how come only the sign (+ or -) in front of the value is changing, without even changing values (significantly) and even without passing through “zero”.
So, are the values (meters) wrongly callibrated ? or am I missing something else ?
I’m using only “internal” meters from Victron MP2 and JK-BMS (16S battery 280Ah)
I know this is a late reply but I have the same situation as you. If you set the location of the PV Inverter for “input” you will see this strange behaviour. I can only assume it’s a bug and it’s still present in v3.62 at the time of writing this.
With the PV inverter position set to Input, you’ll get the PV generation shown as grid export in the VRM despite it showing correctly in the local GUI. You’ll also get a low AC Loads value because the PV generation is not being included in that figure.
The “fix” is to set the PV Inverter position to Output, even though that’s not intuitive. In this mode both the VRM grid power and the AC loads power should show correctly.
Hopefully this will be confirmed as a bug and will be corrected in a future FW update.
Thanks for this post. I am another with the same issue. It was quite frustrating until I read this post on how to make VRM give useful readings. But something must be wrong if the Venus OS GUI and VRM have completely different behaviour according whether a PV inverter (on the grid side of the Multiplus II) is described as connected to the ‘AC output’ or the ‘AC input’. People have been reporting this problem since at least 2022 (ESS VE Config query when using current sensor instead of grid meter. - VictronEnergy) and nothing seems to have changed. Can someone explain why this is the behaviour and why it’s not being changed to work the way everyone thinks it should?
