MUST EP1800 Inverter not charging Batteries

[mschulzsa]

Hi all, I am hoping someone can assist me as this has left me scratching my head.

I recently bought myself 2x 12v revov 200ah lithiums :REVOV 200Ah 12.8V 12V LifePO4 Lithium-ion Battery - 2nd Life Cells / 2.56kWh WITH BLUETOOTH - GeeWiz

I have connected the up to my old Must EP1800 (EP18-3024) 3000va inverter.
System works well for everything but charging the battery. symptoms are as follows:

Charge light on and flashing to indicate charging. No power draw from the wall indicating the batteries are being charged, both batteries BMS indicate 46% SOC and not moving even after hours, so definitely not charging. The inverter's display also shows batteries are at 26.4V and that they are full, unlike the BMS saying half full.

I have set the settings as follows (even after trying a reset it wont charge)

[01] UTI
[02]APL
[03] 230
[04]50hz
[05]Lb
[06]bYe
[07]ltd
[08]ttd
[10]uce
[13] 30A
[14] Li
[17] 28.2 (bulk)
[18]27.4 (float)
[19] 23.3 (cut off)
[20] 23
[21] 27
[22]ptd
[23]lon
[24]bon
[25]aof
[27]fon
[29]sds
[30] eds
[31] 28.8
[33]60
[34]120
[35]30d
[36]ads

I suspect that setting 20 and 21 is influenced only if setting 1 is changed

 

[CheesePuff]

have you check if the volatge on the unit is the same qas what the battery states ?