Not a practical solution for you. A 30 amp draw would require at least a 3000 watt inverter. And it would take a very big battery bank to sustain it for more than a very short time. It takes a lot of 12v amps to convert to 110v amps. A much better solution for you would be the Honda generator. But I also question the 30 amp draw. A 30 amp load is typical for an entire RV with a single roof air. The roof air should only be about a 20amp draw by itself. The other 10amps are for lighting, Micro, etc. I'm guessing a Honda 2000 or 3000 would do it for you.