New Project: Is there an Inverter that can Grid tie and then switch to off grid during power outage?

Current System:
Inverter: Sol-ark 12k
PV: 10kw
Batteries: Fortress 5.4 x 2 =10.8 10.8kwh

Currently I am grid tied but I have 10.8kwh of batteries as a backup. I don’t believe my batteries are doing anything at all, they never discharge and are always sitting at 100%. Given the anti-islanding feature, if there is a power outage then I can not use any power from my PV or my batteries. Is there a way I could turn off the main breaker from the meter and then “Off-grid” my system?

Or, is there a system where I can keep my system completely off grid with PV and battery as the source while having a grid “feed” into the system as a backup?

That inverter can do this well, just needs to be setup with the correct settings.
Read the manual, get the most up to date from their website.

Yes, exactly what I do with my Victron Quattro, but many inverters can do it with the addition of a gateway device.

It also depends on local regulations as to how you have to do it.

Look for EPS (emergency power supply) in the instructions.

Yes a hybrid on/off grid can do that I am using zumax 6.2 kw i just ordered 2 5kw step up/down transformers for 120/240 vac 60 htz