I have a Multiplus-II 3000 GX with 4 Pylontech US2000 lithium batteries.
The inverter was showing "Hub 1 fault" and it was unable to power on.
I found out that one battery (the one configured as master) for some reason doesn't turn completely on. By removing that one battery and setting the 2th as master the system correctly boot up.
What could the problem be with that battery? What exactly means "Hub 1 fault"? Any suggestion on how to proceed to solve this problem?