[rohrmann]

A converter makes 12 volts DC out of 120 volts AC. An inverter makes 120 volts AC out of 12 volts DC. Without the need to run a fridge on 120 volts when not connected to shore or generator power, the converter would be the only needed item. For dry camping away from shore power and not wanting to always be running a generator, and still wanting 120 volt power, an inverter can supply the 120 volt power. On these rigs that have a residential fridge, extra batteries and the inverter provide the 120 volts to the fridge when not connected to shore power.