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Greetings everyone,
What change do I need to do to see Bulk/absorption/float status on Vrm instead of Ext. Control that I have constantly now (see attachments)?
The little but of float is because I just connected the MPPT to the Cerbo yesterday.
Thank you
Hi @Michaeltenerife,
In an "externally controlled" system, the built in charge algorithms are disabled. So Bulk, Abs, and float algorithms are no longer used.
This is most often done when a system charge state is being managed by an external lithium battery BMS for example.
There is a little bit more about it in the manual here.
ohh, ok. So if understand it well: because I connected my pylontech battery to the cerbo as well, the battery is controlling automatically the mppt? There is no need for configuration here anymore? From Victron advice for pylontech batterie charging configuration (https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom) the following information was given: 
Even though I introduced these values in the MPPT configuration, this is now overwritten by the battery for it's optimum care. Is that so?
Thank you for confirming.
For the most part, yes, more or less :)
Following the installation instructions as written in that Pylontech battery compatibility guide is exactly the right thing to do. They have been applied to 1000's of reliable systems over many years.
Now all this doesn't matter right? (I am still not sure from you answer as you say it does matter to set up the recommended voltages but now the battery is taking command.)
Thank you for clarifying.
No adjustment of those settings will change that situation of the MPPT moving from absorption phase to external control when connected to a managed battery.
There is no absorption phase as such for a lithium battery, there is a target voltage and in almost all instances the lithium battery will be able to absorb all current available until it is reached, then current is reduced to almost nothing.
But this is only very general advice, and if your Victron distributor is advising more specific things to your situation, then I would take their advice and follow their instructions over mine.
I did see though the the tail current is disabled on the MPPT config. Is that good?
I guess the blue LEDs on the MPPT are not relevant anymore.
Thanks for clarifying. It would be useful for the display on the Touch screen to show the charge decision that the BMS decides. The LEDs on the Quattro show Bulk, Absorption, etc even while the screen displays Ext.Control. The Touch screen used to show the charging mode in previous firmware revisions (before last Autumn).
In a system with a managed battery the led status is meaningless. Regardless of what the LEDs are indicating, the CV and CC are being controlled by the BMS.
