120 VAC Appliances are the RV appliances that operate 120 volt (household) power.  This power is usually supplied from the campground external power pedestal, but can also be created from a 120 VAC generator.  These appliance include (but not limited to) air conditioning, microwave, 12 VDC power converter, refrigerator (when running on AC), water heater (when running on AC), and electric heater.  In the context of this discussion, 120 VAC appliances are hard wired to the circuit breaker panel and do not incude any protable appliances that can be pluged into a household outlet.  It is generally not recommended to run the appliances listed above from an inverter, and cannot be done in my RV installation.