Hello I have quite the same problem. I configured the smartshunt with following value:
Charged voltage : 26.3v
Tail current 4%
I have two batteries 12v serially connected so 24v. And total Ah is 360ah.
I understand how the 100% soc is detected by the smartshunt. But after manually configured the SOC at 20%, the SOC is at 100% 5 min later.
Currently in winter I have:
battery voltage = 26.7
Current = 0.8a
So my understanding is that smartshunt think my battery is under float mode. But it is not true because my battery are almost empty. During the sun of winter that is very low, the voltage of empty battery is a 26.6v and the current is also very low.
So the smartshunt set the SOC at 100% because it seems it can’t differentiate absorption mode during winter (low current) and the real float mode when batteries are full.
Is there a way to configure it correctly?