Lifepower4 noise and issues

[jwoh]

My inverters were showing code 71!, so I swapped both 6500ex inverters for two others I have and the same issue was occurring.
I have 12 Lifepower4 48V batteries in my setup, I am doing some testing today (and through the weekend) as it looks like even when it is showing over 80%SOC most of the batteries are putting out less than 46V and not powering the inverters. I am working on pulling one at a time for testing however 4 of them started emitting a buzzing sound when turning them back on.
Any assistance with testing procedures for this issue or thoughts on the noise appreciated.

 

[DougfromdaUP]

46 volts is essentially completely discharged. You'll have to charge them, some are probably experiencing low voltage cut off of individual cells. Download the BMStest software from EG4 and that will let you look at the batteries cells.