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All Rv's have a CONverter which, when plugged in, takes 120V and makes 12V DC to charge the house batteries and help run all the other 12V stuff on board.
Some RV's have been outfitted with an INVerter which uses 12V from the house batteries to create 120V AC. Depending on the inverter output size, they may connect only to one plug in the entertainment centre to power the TV when normal 120V power is not available. (~500 Watt units). Others may have bigger units (2000-5000-watts perhaps) that may connect to several outlets but, which outlets or the number of outlets can vary with each installation. There is no standard. These are now popular in units having regular home refrigerators and require 120V power. even when not connected to outside power. These inverters may also replace the regular converter and take over battery charging as well.