It always plans to charge the batteries at full speed. But it seems to limit the maximum feed-in from the grid although it is not limited. This all happened since some other strange behaviour was shown as well. Which can been seen in other comments aswell. To sum it up: It charged the batteries throughout an entire night at 800W although DESS was enabled and it didn’t plan on doing so.
Today I tried disabling DESS and put grid feed in at 2kw, but it also didn’t do anything. I also restarted the vebus, but that also didn’t change anything.
If you are running Dess it is setting an amount of % for that hour to charge/discharge. If you have solar producion energy will not be taken from the grid (or less).
If you manually put the setpoint at 2000W it should charge. is your battery limited internally? is the BMS connected to the multi? how are you measuring SOT?
To sum it up:
I expect the Multiplus to charge my batteries at full speed. Our solar production peaks at 5kw and the multiplus 2 8kva needs about 6500W to charge at full speed. So I would expect the ac in to be 1500W + my consumption in our home. This is what is plans on doing and I have no clear explanation on why it doesnt.
I expect my charge speed to lay much closer to 110A at all times.
For some reason when changing the minimum required SOC to higher than the current SOC the charging speed increases again.
My only guess as of right now that my 3d printer has something to do with this. It runs it’s own PID loop to keep the buildplate and nozzle hot, which might create a high frequency(1hz to 0.1hz) modulating power requirement that prevents the victron from drawing more power from the grid. To prevent overloading the charger. It’s the only thing that has been different from all other days.
Edit:
Forgot to answer some questions. Changing the grid feed in setpoint to 2kw, did not result in 2kw of grid feed in, At that time it was charging at 4kw. and only pulling about 500W from the grid. BMS is connected to the cerbo, but no limitations where given from the bms.
Hmm, strange. Especially that with the setpoint at -2Kw it is still not charging with this speed. A full reset? reload ess asistant, fetch latest firmware?
Yes as mentioned before, when the solaredge is not being throttled and this is the charging current I’m not to worried, it’s anywhere from 90 to 103A still not the advertised 110A, but close enough.
The problem however is when the Solaredge is on full power and being throttled:
Then my charging speeds are between 100A and 50A depending on my load, the Multiplus 2 simply refuses to take more AC electricity from the grid to charge the battery at full speed when for example the clothesdrier is on.
I have updated my Multiplus to v556 from v552 since I have read someone else had some problems with their generator aswell, In particular taking as much ac as it could, saying v555 solved his prolbems.
Redline is moment i updated it. Let’s hope it also solves my charging problem. In the graph you can see very well, how much my charging is throttled when my pv inverter is being throttled. You can also see that ac consumption doesn’t increase regardless of my selfconsumption.
They didn’t give me a solution but it magically works again.
Yesterday before i reached out:(Grid feed in doesn’t follow consumption and doesn’t optimize charing)
