Hi Pops,
Verify there is charging during shore power connections.
Measure the voltage of the battery bank.
Plug in the Shore power.
Measure again.
If the voltage does not increase, then the charger part of the electrical system is not working.
As a temporary measure use a battery charger, while trouble shooting what is wrong with the system.
It might be as simple as a tripped breaker.
Since the inverter side of the unit is still working, I'd be tempted to add a stand alone converter if there has been a partial failure of the Xantrex.