If you are going to be running a microwave that is high in watts, I would get the next larger size from them. Also the use of a hair dryer, t.v. lights etc all on at the same time, would be handled better with their next size up. Yopappa, you probably have gas appliances in your traveller, but if you don't, got to take the fridge, etc, into account also. You could also split your system and use two inverters but that would use more energy than one larger wattage inverter. A run capacitor is also good for those things that take huge loads to initially start up. My evaporative cooler gives my inverter hell when trying to start up.