Ok, this shows some of the loads.
Let’s say 2000 watts max. So, you need an inverter capable of that, and a BMS that can handle the combined loads of your 12V loads, and the inverter load... 2000W at 12V is 167Amps... plus the 12V loads, likely another 30A... so, 190A... figure 25% oversized for comfort, and you need a 250A continuous BMS...
Now, if you arrange the cells in a 24V arrangement, the 2000W inverter drops to 84A, and the 12V is still 30A, so a 40A buck converter to power those loads, brings the BMS down to a 104A average, and you can work with a 150A BMS...
does that make sense?