Inverter
Your units main converter/inverter takes 110 volt from shore power and converts 110 to 12v for lights, heater fan, vent fans, refer and water heater on propane, etc. When not on shore power you will either need a 12 volt tv and run a 12 volt outlet to your tv if not already there or if you don't have a 12volt tv you will still need the 12 volt outlet to plug in an inverter which you can buy anywhere including Walmart. You don't need a large one depending on your tv size. I used a 200 watt and I have used a 400 watt for a 12 inch tv. In effect what the inverter you buy will do is take your 12 battery power and convert it to 110 to run your tv. Obviously if you have a 12 volt tv you wouldn't need the inverter. I am guessing your tv is 110 volt only. If you have two batteries you shouldn't have too much trouble running the tv and 12 volt appliances for 3 days or so given my personal experience.