Good day, we have 2 systems that i am having the same problem with. Battery shows SOC 80 % and inverter shows i.e 60 %, which is obviously not correct.

There is no communication between battery & inverter, both are connected with supplied yellow comms cable, setting on inverter Lithium batt CAN. Question now is what is wrong is it the supplied yellow comms cable, inverter or battery. Really need to sort out, running current AGM Volt and then all is correct on inverter and battery. PLEASE Help!!!!

System 1: 5 kw inverter, 1 x 5.1 kw Akkutech Battery

System 2: 8 Kw inverter, 2 x 5.1 Kw Akkutech Batteries.