DVCC is on external control. So my best guess is that you have to look for a setting in your bms or the thing that controls the charger/discharger.
Hi @moltean,
Looking at the behaviour of the system it appears that your AC PV inverter is physically installed on the AC input side of the MultiPlus, but it is configured for the AC Output (in the AC PV inverter menu of the GX device).
(edited to add) Or it is connected the AC output when configured for the AC input.
Is your system on VRM? Could you please post the VRM URL?
The SMA energy meter is not supported by the Victron system.
You can see our list of supported energy meters here - https://www.victronenergy.com/upload/documents/Datasheet-Energy-Meters-Selection-Guide-EN.pdf
You donât necessarily need an energy meter, but it does depend a lot on how your system is wired and configured. It may or may not be necessary.
If you wire the AC PV inverter to the AC output then you shouldnât need an external energy meter unless there is loads on the AC input that you want the Victron system to supply to as well.
Have you seen my ESS training?
Hi,
Here is my vrm url:
https://vrm.victronenergy.com/installation/462828/dashboard
Yes, my PV inverter is added to the AC IN of Multiplus.
Where exactly is the setting with AC IN/OUT?
thank you,
It is in the PV inverters menu of the GX device settings:
Hi,
From the docs of ESS: âTo measure PV power coming from a grid-tie PV inverter of a type other than Fronius, SMA, ABB or Solar Edge, you will need one of these:â
So, I was under the impression that I did not need another energy meter.
Where should I place the new one?
waiting,
Strange, can you try changing that setting to the AC output instead?
I think that will fix it, but you might need to leave it for a bit to see the effect.
Oops, I have fixed that issue with your account, itâs a spam prevention, but overactive!
Yes, please leave the setting as AC output for an hour and letâs see the results.
ok.
Iâll contact you again in 1 hour if it is not working.
But, could you please tell me why I set the inverter on AC-OUT even if it is connected to AC-IN of Multiplus?
Thank you,
I am just going by the behaviour of the system, which appears that the configuration setting doesnât match the physical wiring.
Maybe you could post some photos of your wiring, and a system wiring diagram, and how the AC PV connects relative to the MultiPlus.
I could be wrong, and itâs something else, but thatâs the fun of troubleshooting.
Hi,
One hour has passed, and nothing has changed!
I disconnected all loads (except batteries), but the system shows loads (equal to the solar power).
Ok, that doesnât look like it helped at all then, please change it back and I will come back with another test.
Is this still true? Should I buy an energy meter from Victron?
This is not a problem, but currently VRM shows the correct values for PV production and for the grid feed-in âŚ
It is true that the SMA energy meter is adding nothing to the situation, and is not supported by Victron. I am not sure if itâs the cause of any issue though.
I have asked a colleague for assistance with the next step.
I donât recommend running out to buy the energy meter yet, but please confirm you have watched the ESS training video above?
I will watch it later todayâŚ
Thank you,
One more thing: It will charge if I set the grid setpoint to (letâs say) 1000W.
But, it will take from the grid too, if there is not enough excess solar power.
I want to charge only from excess solar power.
I have the feeling the system is behaving normally, except that you donât like it.
Having that PV inverter in the AC-IN is just like when you donât have it at all.
Or like your neighbor is having it, neighbor who shares the same grid phase with you and injects some PV energy into grid.
Connecting it to Cerbo is just making the Cerbo aware of it, but only that.
So, finaly, in this case, is just like you have only MP2, Cerboâs and Pylons.
Try to connect the PV inverter at MP2 output and then Cerbo and MP2 is really controlling it and make use of its generated energy, before injecting the rest to the grid.
Alex, from the docs:
âAn Energy Storage System (ESS) is a specific type of power system that integrates a power grid connection with a Victron Inverter/Charger, [GX device] and battery system. It stores solar energy into your battery during the day for use later on when the sun stops shining.â
âWhen an ESS system is able to produce more power than it can use and store, it can sell the surplus to the grid; and when it has insufficient energy or power, it automatically buys it from the grid.â
I do not see where it is written the fact that I must connect to AC-Out.
Also, I cannot connect to AC-Out, because my MP2 is only 3kW and I plan to have load higher than 3kW, so the 1-1 rule will not be respected. Also, my SMA Sunny Boy and panels are a 6kW system.
Edit 1: I would not have made the investment (in Victron and batteries) if I could not store the excess solar power in batteries.
Edit 2: Also I do not understand the problem: Cerbo GX knows precisely how much solar is produced. So, why is not charging batteries with just that amount?
OK, maybe I am wrong, but it doesnât say from where that solar energy is coming.
If this is the case, how you are saying, then maybe a compatible energy meter is in order for knowing exactly how much is entering the Victron âuniverseâ.
I will stop here and let much more experienced people to advise⌠Sorry.
Notice where the additional grid meter is installed. It will measure what your house is consuming additionally.
Meaning if your SMA is producing a certain amount of power and MP2 is consuming it all, the grid meter will register 0.
If instead you are using the SMAâs power meter, then SMA doesnât know how much your MP2 is drawing.
Or am I wrong?
Or maybe the SMA firmware is not talking correctly with Cerboâs firmware. There were cases of incompatibilityâŚ
