With MPPT charge controllers the panel voltage can be much higher then the battery voltage, and the charge controller will handle it just fine, assuming it is within the voltage limits of the charge controller.
Panels are specified at 25c/77f and temperatures colder then that will result in...
Input breaker size is going to be dependent on your grid service size but in the range 60-125 amps. Output breakers should match the input breakers. One ground connection from the inverter to the ground system is required. You will need neutrals from the input panel and the output panel...
Make sure you understand landlord tenet law around utilities and submetering. You may need to install a revenue grade meter for each tenet even if it's not used for billing. 100amp is the minimal size for a residential service, but you will want to a load calculation to determine if that will...
Ground fault and arc fault are implemented by the inverter or charge controller, their aren't external ways to add this protection to inverters without them.