Batteries go into alarm

[Papote]

I have 2 Orient Power 48V 100Ah 5.12Kwh Powerwall LiFePO4 Wall Mounted Battery connected in parallel to 2 Orient Power LV6548 120VAC 48V 6500W inverters connected as US split phase. I don't have AC grid in connected. I am only pulling like 200 Watts at the most on the AC output side mostly from inverter 2.

Every so often one of the inverters goes into failure and shuts down both my inverters. Sometimes the system restarts after a bit automatically, but others I have to manually turn everything off and on again. Both batteries show OVP, UVP and SCP errors.

 

[Korishan]

Just to verify, you have both inverters configured identically for the battery voltages? Meaning they both have, for example, 42V Low Battery Voltage Cutoff?
I ask because if one of the inverters are configured for a higher voltage, it could cause a cascade issue where one unit shuts off before the other one, and then the one left is doing double duty.

For instance, if Inverter-A is configured for 46V Cutoff Voltage and Inverter-B is set to 44V, when the battery voltage drops to 45V then Inverter-A will shut off due to a UVP error, and then Inverter-B will surge in load on it and it'll trigger an OCP error or something similar.

I'm just guessing here with what happens, and how your system is responding.

When the conditions occur, what is the battery voltage, the battery load (in amps) and the output load on both inverters??
Do you have any logs you could post?

The other thing, I think, is that if they are connected in Split Phase mode, and one of them goes offline, it should cause the other one to trigger as well. Again, I think that it should do that.

 

[Papote]

Seems the battery nuts were loose. Tighten them all up to 10 NM and seems fine for now.