I have five Greenrich 3.6 batteries connected in parallel. The + is connected from the breaker to the + of the #1 battery with each + then connected to next battery. On the - side the breaker is connected to the #5 battery and then each - connected to next battery. The cables from CB to #1 and #5 are exactly the same length. The interconnect cables are all exactly the same length. All cables are the same resistance. I have 2 5kw Deye inverters in parallel and the breaker is connected to the positives and negatives of each inverter. My problem is that that batteries SOC on #5 is always about 10% lower than #1 with the SOC rate lower on each successive battery until the lowest at #5. The inverter seems to read the lowest battery when deciding to shut down so I effectively lose up to 10% of my battery power. Ely Power (Greenrich) seem totally incapable of solving the problem. Any help will be greatly appreciated.

11 hours ago, DaveK said:

My problem is that that batteries SOC on #5 is always about 10% lower than #1 with the SOC rate lower on each successive battery until the lowest at #5.

First of all I wouldn't trust the BMS too much. I have BMS readings on my packs of 100% SOC while the voltage has not yet reached full charge level and charging continues. The other issue is that packs may charge somewhat differently due to differences of internal resistance. However, that is not a problem. As I described in another thread they will equalize themselves. BMS has nothing to do with it. I have no connection of BMS to inverter, the charging management is done by the inverter on the base of battery voltage and correct settings. That never lies. The BMS is useful for battery protection and SOC monitoring.

What’d you describe is exactly what BMS is showing. so you would suggest removing ca cable  fro BMS to inverters and allow the inverter to manage the system. The BMS can tnen stay connected to other batteries for protection and SOC. Tanks for you suggestion

1 hour ago, DaveK said:

so you would suggest removing ca cable  fro BMS to inverters and allow the inverter to manage the system. The BMS can tnen stay connected to other batteries for protection and SOC.

Yes, that's what I suggest. Important are the inverter settings for bulk and floating charge voltages. Consult the data sheet (specifications) of your batteries.

I have the BMS of my packs connected together with RS485 jumpers and with a RS485 cable and USB-adapter to my laptop. I can monitor each pack individually.

Thanks Beat most helpful. I will leave the rs485 interconnecting the batteries and remove the can cable from the prime battery to the inverter. Will let you know what happens

any update on your progress with removing the ca cable?