If you are willing to go to a 5 cup drip coffee maker, it can work. I have 2 6V, 232 amp hr Interstate batteries & a Xantrex 1000 watt pure sine wave inverter.
Starting in the morning with the batteries at 12.6V, I can use a 900 watt toaster to toast an English muffin, then brew 3 cups worth of coffee in the drip coffee maker that draws around 65 amps. The combination will draw me down 10.5 amp hours, around 6 amp hours for the coffee maker alone. If I do both toast & coffee, the inverter will sometimes alarm during the coffee making, but does not shut down.
