A 12,000-watt generator is designed to power multiple appliances at the same time. There are no strict restrictions that you need to follow as long as you do not aim for too much. These generators can be used to power all the basic appliances at home simultaneously without any fear of overload. You will be able to use basic necessities like lights and fans along with appliances like the refrigerator and the furnace. You can also use this generator to watch television, and power the microwave oven without disturbing any of the other appliances. These generators can also run central air conditioning systems smoothly at the same time.