A GE 18.0 cubic foot top freezer refrigerator uses 15 amps, so it would require 1,800 watts (plus a bit more for start-up current.)

A typical 100 watt light bulb uses, well, 100 watts. (Switch to Compact Fluourescent Lamps — they use about 10-15 watts.)

A 20" conventional TV (Philips SDTV) uses only 120 watts of power.

A GE Spacemaker II countertop microwave oven (800 watts of cooking power) actually uses 1,300 watts of power. (The electronics are not 100% efficient converting input power to cooking power.)

Add it all up and you need about 3,000 to 3,500 watts to run all these appliances if everything was running at the same time.

However, a refrigerator compressor cycles on and off, depending on how cold you want it, how often you open the door and how hot the outside temperature is. You could say that its duty cycle is about 10 to 20%. A microwave oven is only on when you are cooking with it. It's duty cycle is very low – about 2-5%.

So you could get by with a smaller generator and unplug some appliances when they don't need to be used.