We have a pathway X2 and a 211 receiver and a 45" sony tv in the main room. All run off our inverter without problems.
In the bedroom, we have a 211 receiver and a 32" sony tv and run it off our portable inverter (through a 'car plug' rather than direct wired) with no problems. The inverter is a 300W pure sine and the 211 and TV only pull about 80W combined. We use this to save battery as we have other stuff connected to the house inverter. We need to conserve the batteries at night to make coffee in the morning...
We only have to use the generator to watch TV if our batteries are less than 50%, which never happens because we have solar.
I have had to camp near people who believe they need a generator to watch TV. In both cases, they had a 5K open frame construction generator. They ran it for HOURS just to power 300W worth of tv.