Remember, the inverter really isn't powering anything. It is only inverting your battery DC to AC. If you want to power items within your coach from your battery bank, you need to know what the amp hour draw is of your devices, how long you want to use them, and then you can calculate the size of the inverter and battery bank you need. Also, when looking at inverters, it is important to know the surge (max) as when you power on some devices they require more amps to start then to run.
Here is a good calculator:
Solar Sizing Calculator | Solar Cable Gauge Calculator | Battery Interconnect Calculator - Renogy Solar
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