Johan v d W

Hi @Johan v d W
I believe that there are a number of issues that you need to address;
The Axpert is no good at determining State of Charge and you will damage a very expensive battery bank unless you make some changes fast - install a BMV-702 battery monitor and ICC software to monitor the equipment and control switching behavior using info provided by the BMV - this will cost a small fraction of replacing a damaged 800Ah battery bank.  Download the Coulomb/Weber firmware and flash your system, the primary advantage is that it addresses a bug where the Axpert goes to float too early resulting in battery under-charge. If you dont already have buy and install 4x HA-02 battery balancers to make sure that your batteries stay "in synch". Series connected batteries can very easily go out of synch resulting in failure of the entire battery bank - look in the downloads section for more info. Lastly I have to say that your system is way out of balance. You have 12 x270W panels which will produce 16kWh on a good day. Your battery bank is 800x48 = 38.4kWh, even at 50% discharge you will need 19kWh x 1.25 (inefficiency) = about 24kWh to recharge, and that is before you have supplied any direct consumption loads.
You will need a 2nd Axpert in parallel and another 12 panels to balance your system (both inverters would share your existing battery bank).
Coulomb - Patch Instructions.docx