For the ON/OFF control from the SBMS0, it should be ok with the arduino Nano Every.
Since the display controller of my inverter/charger has a PUSH ON/OFF button seperately for Inverter and Charger, so I just need 2 arduino Nano Every, one for inverter, one for charger. that should do the trick.
For the Shunt, I am still confused.
I thought the reason we need 2 Shunts connected to the + of the battery, Load to 1st Shunt, Charge to 2nd Shunt, is to get a separate reading of charging Amp and Load Amp. In my case, if I connect my Inverter to 1st shunt, when it is charging, isn't the charging current will go through the 1st shunt, not 2nd?
In another way of saying it, it is effectively using only 1 SHUNT for LOADS and CHARGE (from Shore power).
This is my beta version of my electrical system setup, but it shows my concerns on the SHUNT connections.
Am I making sense here?
Here an example: LOAD 30Amp and CHARGE 60Amp
1) With 2 SHUNTS, the BMS will read 30A Loads and 60A Charging Current
2) With only 1 SHUNT, the BMS will reads 0 Loads and 30A Charging Current.
Everything still works fine, but I will not able to read the current flow information correctly from the BMS info.