When the Pylon max cell voltage reaches 3.49v and battery soc get close to 100% the MPPT charger stops charging for a few minutes.
Sometimes is a minute. Sometimes it’s 10+ minutes. After which solar is inverted to grid as configured.
I can imagine charge curves and algorithms need changing once we get close to 100% but 10 minutes ? It also happens with a clear sky so I cannot explain the saw-tooth behaviour either. Why do the multi’s not start inverting energy back to grid more quickly?
Probably single cell overvoltage shutdown of the battery
3.49max and 3.46min using all standard cables and standard DVCC settings should not cause a battery high voltage error. And even if it does, that’s only for the unit with the 3.50v + cell.
Also, it’s during a DESS charge plan. So the MPPT RS stops charging but the multi’s are still charging. The lower right tile shows that the battery is still accepting quite a large current. So the decision to stop charging lies with Victron. And Victron is known to use far lower charge voltage to prevent high voltage errors and to preserve battery life.
During other occurrences, the delta is also only 30mv. Not perfect, but OK I guess.
Pretty normal for the charge current to drop down, and the Soc to stall at 95% until the BMS is happy to report 100%
Takes time…
I’m a patient person so things taking time is just fine. But I do like to understand them if possible 
In this case, BMS does not report 100% before MPPT charging continues. The graphs seem to indicate the MPPT charger stops charging exactly at the point where charge voltage has reached 52.5V after which the charge current of the multi’s is regulated down quickly but it does continue to charge at 70A or more from some time.
So battery is still happy, charging continues at that 95% mark to try and reach 100% but the MPPT charger just sits there for 10min. After the 10mins, it starts helping the Multi’s to charge the battery to 100%.
