Welcome to iRV2.
Question .
Why have you disconnected the battery ?
Some brands of inverters( or converters, not sure what your RV is equipped with ) need to see a battery in the circuit order to properly regulate their output voltage .
Note that , converters are actually ; converter/ chargers and the larger inverters ( 2000 watt ) are ; inverter/converter/chargers.
If you don't have manuals for your RV systems and appliances get the make and model info and look for a manual at this site.
www.myrvworks.com/manuals/