Hi,
Inverters do not come on most RV's, only some of the more expensive units. You really need to pick out one for your needs, not everyone needs the same size, and those who just travel from one RV resort to another will never need one.
You also need upgraded batteries to get the RV to run on a inverter and still have power in the morning. I would suggest a 500 watt inverter - it can plug into a cigarette lighter. I installed one in my RV next to the TV set, with #10 wires from the battery with a 30 amp fuse. This will allow up to 300 watts output, more than enough to run the DTV and TV set.
With a pair of batteries, you can run the TV and receiver - about a 100 watt load for at least 5 hours per night, using about 50 amp hours of power. Then charge the batteries during the generator run hours, such as 9am to before 7 pm. You only need to run 1 generator about 1 hour in the morning and 1 hour towards night.
Many times I would set up my TV to run from the inverter, even if I had 120 volt power while running the generator. then when you are ready to shut off the generator, you will not need to stop the DVD and shut off the TV set to plug everything into the inverter. The generator will power the charger, it will power the inverter and any excess amperage will go to recharge the batteries.
Fred.