I'm pretty sure it's input power. I just checked the sticker and it's actually 1380 watts. The sticker says 11.5 amps, 120 volts, 1380 watts. (11.5 x 120 = 1380). I'm seriously considering just skipping the microwave. The next largest thing that I would run is a tv at 40 watts. That would greatly reduce the cost of inverter that I would need. Of course that would also mean that I have grossly overbuilt my power for this rig. At 330 ah and 300 watts of solar, I could literally leave every electrical device in the camper on 24/7, including the tv but excluding the microwave and ac and I would never run out of power.