Inverter making shunt type noise, like stuck relay?

do you have solar ?

I would try to avoid charging with the Xantrex
turn off the circuit breaker to xantrex
this will stop all charging, turn off the inverter function when not using it
this will minimize power drain

if the batteries get too low for things to operate, use an external charger on the batteries, it will cost a lot less to replace, IF something happens to it