You need to push Save Device Settings else after a power cycle the settings for current shunt will be lost.
Can you show me the advance parameter settings screen ? Have you made any changes there ? I see you power cycled again so did it showed 0% when you plugged in ? or did it showed 50% and dropped to 0% ?
I see that you always have that 2600W load. What is that ?
Nevermind. I just took an SBMS0 I had on the bench and set 3900Ah as battery capacity and I see 0% SOC. None had such a large battery before and I did not test that. Maybe there is some error likely a variable that is not defined as large enough.
I will investigate this and probably you will need a firmware update.
It seems that max battery capacity for witch it works correctly is 2147Ah (A bit strange but I will look into where the problem is so ignore all my above questions).
For now just set the Battery capacity to 1950Ah and while this will not be correct you will have a SOC indication.
So when you will power ON it will show 50% then if you charge at some point battery will be fully charge and SOC will reset to 100% SOC and from there the SOC indication will be correct only that with half the real battery capacity 50% will mean 75% and 0% will mean 50%
I will look in to the problem today and I hope I will find the issue and release a firmware update. It will not affect anyone other than you as up to now none had a battery above 2000Ah.