Strange behaviour I cannot explain .
System is
Multi II 48/5000
2 X 435 W panels on 150/35 in 2S
4x 435w panels in 2s2p on 150/35
2 x Pylontech UP5000
Cerbo GX
.....
Connected to grid as AC IN.
No output or export to grid
VS settings
System installed 1 month ago. very similar to many other systems we installed with same components.
all worked well until yesterday. client called saying system went off 3 times in the morning , then quickly came back in by itself after a few seconds.
I checked online via vrm. indeed noticed these ve bus alarms (low battery) . investigated and found the cerbo was only seeing 1 of the 2 pylontech.
the batteries were never low, and still have not been.
client is far. talked to him. made him check the pylontech data cables : Pylon 1 to pylon 2 short cable and pylon to cerbo victron blue ve can type A cable.
found that pylontech data cable linking 1 battery to the other had its terminal a bit loose. connected correctly . turned back ON. All seemed ok and could see back the 2 pylon on cerbo .
but it did the same yesterday and again today.see screenshots .
main difference is that cerbo sees well the 2 batteries. all pylontech parameters look perfect.
looks like the system is loosing bms parameters. anybody had issues with victron cables typea for pylontech up 5000 ?
any other bright idea ?
grateful for some feedback