There should not be an issue with the shunt in circuit, or the use of a incorrect fuse for the inverter, you have other problems.
Without knowing the status of the batteries its difficult to advise, ACr error suggests the Rover is upset with battery volts.
I recomend you reinstall the Victron shunt and use the voltage and current display to help fault find the problem. Note the SOC reading is perhaps incorrect if the unit hasn't been set up correctly.
You need to confirm the state ofcharge of the batteries, battery volts will give a rough estimate.
Note its important with the Rover to 'see' battery volts before panels are connected, with the battery isolator switch its easy to invoke this requirement. The Renogy Rover has been known to have issues and is not a 'first choice ' for a reliable system. With a Victron shunt and Lynx distributer, a Victron Smart Solar controller would have produced a more Integrated system.
Mike