I'm speaking of the kind you just plug into a cigarette 12v outlet, my unit has couple in the coach by the bed and dinette. As far as a TV, another option is buying a flat screen that's ac/dc powered then you wouldn't need an inverter for it. See links below for examples.
TV that's dc powered (cig outlet)
Pure sine inverter safe for electronics (uses cig outlet), but buy size based on what you'll use it for.
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