Once you figure it is all safe to do around your family and this is what you really want to do this to your inverter then is what one dude on google search did to combine two Honda generators to a RV30A FEMALE connector. Since these type of things have hazards involved you usually can't find one already made up and you have to build your own. Should combine two separate 120VAC circuits into one RV30A circuit. I would contact the manufacturer of your Inverter to see if you can combine these two sides of the inverter receptacles. This is usually a trick the manufactures publish for a 2500 WATT Inverter which has two 1250WATTS circuits. They don't intend for you combining the two circuits together to get a full 2500WATS on one receptacle. Alot of portable generators do this as well. You think you have a certain wattage generator but you really have two lessor wattage circuits putting out half the wattage and you can't combine them. The other post is probably "right on" and it may go up in BLUE SMOKE doing this...


Use at your own risk I guess...
Roy Ken