Insufficient solar
Check if the Multi RS19 Solar reaches the float charge stage each day.
To investigate look at the history tab in the VictronConnect app. The histogram displays how long the batteries have been charged in the Bulk, Absorption and Float stage each day, for the last 30 days. If you click on one of the histogram columns you will see a breakdown of the charge stages.
You can use the charge times to see if the PV array is properly sized for your requirements.
A system that never reaches the float stage could have the following issues:
Not enough solar panels.
Too much load.
A problem with the array causing it to have a reduced power output.
For more potential reasons see paragraph: “PV power or yield less than expected”.
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System spending all its time in bulk with breakdown of charge stages - System in bulk and absorption