Not trying to be a smart alek but the inverter runs anything the is 110 volts when you are on the batteries and the batteries run everything else. If you can turn your inverter off that should tell you what is 12V and what is 110. The big draws on your inverter will be anything that heats (Microwave, heaters, coffee pot etc.) and anything that cools (refrigerator). Some motors are a fairly large draw if they're big enough. Most of the other stuff doesn't draw too much but they all have an amperage rating on them somewhere. Something like 15A, .5A, you get the idea.
Sorry I can't see your original post when I'm replying. To answer your exact question you can pretty much run anything you want, the question is for how long. You only have so many amp hours in your battery that are usable, about 50% of actual capacity. Think of these as gallons of water. I you run something that take 15 amps it will use 15 amp hours if you run it for an hour. It will take 30 amp hours if you run it for 2 hours. So it's really a math problem. Also, your inverter is probably only about 80% efficient so in order to use 80 amp hours in your coach you will draw 100 amp hours from your battery. The newer inverters may be more efficient but you literature should tell you the efficiency somewhere. Good luck.
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