Matteo_Mantovani

On another forum I also posted about this and got the suggestion:
"52.5V is way too high for a float voltage.
Recommend you set:
Bulk: 51.75V
Float: 51.0V"
A post from Coulomb in January suggested to set Bulk at 52.5V and float at 51.8V although these were generic recommendations not specific to my current issue.
Here is the discussion I had with Pylontech (earlier, and not in reference to this specific issue):
PYLONTECH: "please set the following parameters that are on the battery side.........:
Bulk charge voltage 52.5V.
Float charge voltage 52.5V."
ME:"If float charging voltage of 52.5V is OK, then I guess a lower float voltage 51.0V or 52.0V might be OK for charging to less than 100%. But never >52.5V. Do you agree?"

PYLONTECH: "That's correct! Because sometimes the voltage sensors on the inverter terminals are not very accurate, the full battery voltage is around 53.2V(smaller than 54V). So 52.5V is a charge voltage value that has been limited in a safe range! You do not need to worry about this. "
Would be open to recommendations from others on float and bulk settings. e.g. @Coulomb@Beat@Donand others too.

 

Batteries are designed to go down to 5%. I wouldn't take them that low though.

Are these batteries all exactly the same age?  The reason for asking is that the cycle counts are very different.
If they are the same age it could be due to unequal cable lengths.  Are they connected correctly - positive and negative at opposite ends of the pack?
I run 10 pylons and never see difference like these....

The SOC follow the ages nearly perfectly. Pack 2 is very slightly different.

It really isn't a problem.

As the load affects the voltage and further depending on how the 6 batteries share the real time load the voltage could be very different even at the same SOC. Thus not a method that means much. 
Earlier replies indicate some reasons for the 7-10% difference. 7% not easy to detect with voltage. 

They will vary. It can be dependent upon a number of factors, eg ages of the batteries, how they are wired, etc.
Your batteries SOC will be a lot more accurate than any voltage values due to the voltage curve of the battery.
I wouldn't worry.

The battery doesn't get much data from the inverter, at least that it can pass on. My understanding is that the computer running MultiSIB has to connect to the inverter, separately from the connection to the battery's BMS.