Agreed, I think limiting the maximum power is an easier approach. It’s also meant for a grid-connected setup.
Can you disable PowerAssist on the Multi RS? I don’t recall seeing a setting for it like on the MultiPlus-II.
I am having the same issue. Put in a case with Victron (via importer) will see what they reply. This is a problem when you have stack of batteries and one by one they get empty (or you have for whatever reason 1 full and a bunch of empty ones).
All,
Just stumbled onto this thread while searching for my current issue..
My 3x Multi RS’es are currently shutting down the battery multiple times overnight when discharging to the grid.
The DCL is 210A on the BMS (189 on the inverter). However the inverters reach up to 230-240A individually and perhaps - if not limited by the BMS - would even try to go higher than that.
Not exactly the desired behavior.. Any solution plan yet?
Are there any warning from the bms?
What battery and bms brand do you have?
Did you update the RS or Cerbo very recently?
BMS indeed warns/errors and blocks the discharging.
JK BMS v19 with Yixiang MB56 box (32 kWh)
Cerbo is on v3.70 and RS on v1.26, both recent versions indeed.
For the RS: update to 1.28 wich is the latest.
The 1.27 version does have updates on some unwanted 3 phase behaviour.
Do you run DESS? I think this function isn’t very reliable…
For ESS function I run “external Control” because “Optimized without battery life” caused huge power dump from battery to the grid. (I have the RS 6000 and 2 DIY batteries with JK BMS V19)
Thanks. will do.
I do use DESS, so far works pretty good in terms of logic. I’ll try the ESS ‘external control’, but I suppose that comes with your own custom ESS settings. Any tips/tricks on your config there?
Thanks and cheers
Update: What worked for me as a containment is to set the Multi RS settings –> battery –> Max discharge current (this is per unit as well). So if you want 210 A max battery discharge, set this to 70 A.
Of course, this still doesn’t mean the system respects the DCL from the BMS so behavior remains NOK.
Hi Matsudo,
Initially, we solved it the same way, but it’s not ideal.
It shouldn’t be a problem if one Multi RS has a higher discharge, for example to keep the phases balanced. However, the total combined discharge must not exceed the DCL.
I’m not sure which update resolved the issue for us, but we haven’t had any problems for quite some time now.
What I recently noticed is that the DCL does not appear to be controlled based on the current measurement from the JK-BMS, but rather on the current measurement of the three Multi RS units. Is the current measurement of your JK-BMS calibrated?
Could you check in the Remote Console what the DCL is? How many percent lower is it compared to the value set in the JK-BMS?
Hi Johan,
It’s indeed not ideal. BMS is well-calibrated, the sum of the current reported on DC side by the 3 Multi RS’es almost perfectly matches the JK BMS current.
The DCL is set at 189A, corresponding to 90% of the JK BMS limit 210A.
Have you by any chance already checked the DVCC settings?
I have just run a test as well, and it seems to be working fine here. I did test it while charging the battery, but that shouldn’t make any difference. It was different before the update, though.
I’ll re-test it tonight now that I’m on the latest firmware. Will post the results here. Hope it was an issue with v1.26…
Although I think I already know the outcome; last night it again discharged well above the DCL.
Not sure it makes a difference but my problem was not with the charge current, but only discharge. any chance you can also test that?