What does it mean, if one of Multiplus 2 inverters in 3 phase system (L1) is flashing “Low battery” LED? System is working normally, all inverters support loads. No alarms in Cerbo.
My system suffered with the same problem. However its probably anyhow possible to supply diffrent parameters to the ESS assistants inside the Multiplus. After FW update and reprogramming the ESS assistants including its parameters, the problem is away. See this thread.
Low battery flashing means “Undervoltage of battery”.
There may be issues with the DC Connection of that particular unit.
Did you use equal length cabling for all units? Maybe that unit is experiencing a too high voltage drop, compared to the others? Maybe just a connection went loose / bad?
There are no issues with cabling, everything is tight and usually working normal. I see this behavior sometimes, not regularly.
Check/replace the DC fuse.
Please help. I still see “low battery” on L1 phase inverter at SOC about 40%. Tried everything, updated firmware to latest, etc. Voltages on DC bus are equal everywhere.
(dashboard 442946)
And what does the dc ripple look like?
I have this exact same problem.
New installation and the L1 inverter flashing low battery.
The inverter runs loads just fine but when charging it also does not produce any charge current while the other two charge at their set current.
The L1 also has the shortest DC link.
So voltage drop is clearly not the issue here and to make sure of that I’ve measured that under significant load.
Check you loaded the correct config on each inverter.
How do I do that? I’ve loaded the setup for 3-phase system via my cerbo-gx and the vrm portal.
The configuration after assigning the phases went like configuring a single unit.
How can I check that config per individual inverter?
You can’t initially configure a 3phase or parallel system via vrm. Can only be done with a mk3 and the quick/system configuration tool.
Thereafter the same configuration is loaded on every inverter via the same tool. If this process hasn’t been followed, systems will be mismatched.
Forgot to mention.. I have used the mk3 for that initial 3-phase config, and it does show up&runs as proper 3-phase system both off&ongrid.
Meanwhile I moved my desktop PC next to the system and did a whole new install, the error is gone now.
Don’t know what caused it but did got me a brandnew laptop this afternoon.
I suspect my old laptop to have some weird glitch, anyway thanx for the help and quick response 
Tomorrow we’ll stresstest the system and will see if anything more comes up.
Have you perhaps found a solution yet?
I’m running into the exact same issue and have checked everything I can.
Thanks in advance.
I don’t know why you should turn it of or not. I said it is a hint.
It solved my red flashy light problem. I have a Lynx Shunt wich appears as a seperate BMS in the Cerbo. Maybe this was necessary in my case because I have a virtual battery in place since the day before yesterday for solving another issue with SoC precision and integer values: DESS charges only 1-2 minutes per quarter due to hourly SOC target communicated every 15 minutes
The virtual battery is visible on the bus, but the MP2’s take no notice of it? I filled all the available fields with values from either the Lynx Shunt or the actual battery. Anyhow, maybe one of the relevant fields for the MP2’s is still missing in the virtual battery implementation?