Hi, we have an installation with 2 Quattros 15000/48 in parallel, with ESS assistant, controlled by Node Red on the Cerbo.
1x SmartSolar MPPT RS 450/100-Tr
1x SmartSolar MPPT 100/20
1x ABB/Fimer 4kW AC coupled PV (on AC-out)
LOM disabled (external Ziehl), the setting is Other: not compliant to any grid code standard.
Around 40kWh LiFePO4
Everything runs fine except 1-2 occasions every day or night, I can only deduce the grid becomes unstable and the Quattros really struggle with this (loud humming noises), but they don't disconnect from the grid. During these episodes, everything at the house dims/beeps/flickers. This goes on for 2-3 minutes and then returns to normal.
This is kind of random because it happens both with a 30% battery and sunny, or 60% battery at night. Battery SoC and PV power don't seem to matter.
If I disconnect from the grid manually, the system immediately becomes stable, and if I reconnect too soon, it becomes unstable again.
Is there a way to detect this and force disconnect for a few minutes?
I can't seem to detect this under Node Red because the readings aren't realtime as you must know, they only refresh every few seconds.
There are many variables at play and I'm not sure where to start, because I don't know how I could simulate these occurrences to test the behavior.
Thanks in advance for any input.
Cheers