A kilowatt is a measure of power primarily used to measure electric power. Power is the ability to do work. Kilowatt hour is a measure of energy or work. It is measured by multiplying an amount of power by the time period it is being used. If an electric motor draws 1 kilowatt for one hour, then it has consumed a kilowatt hour of energy. You have found that the average home uses 24 kilowatt hours of energy per day. That includes all of the energy of all of the electrical devices in the typical home including lighting, heating, air conditioners,appliances, televisions, radios, computers, etc. However it doesn't tell you how much power the home may be demanding at any one time during the day. For example, in the late evening when everyone is sleeping, the power demanded by the house will be small probably just the refrigerator, heating, clock radios, and some night lights. This may be on the order of 1 kilowatt or less. During the day, if the air conditioner is on and the dryer is on, the house load will be many times 1 kilowatt (an electric dryer probably draws about 6 kilowatts or more). What this means is that any device designed to power a home has to take into account not only the total energy consumed (which determines the amount of fuel used by the device, whether a steam turbine driving an electric generator or a fuel cell) but also the maximum power that the house may demand at any time during the day. Many electric utility companies charge not only for the total energy used (kilowatt hours) but the maximum power demand (peak kilowatts) because that determines how large their generating capacity has to be. Thus you can see that a fuel cell that can provide 1 kilowatt for 24 hours might supply the total energy a house consumes but would never be able to power the house when the electric demand is at a maximum. That maximum value depends on the electric devices in the home and when they are used. It is possible that air conditioners, television, washers and driers, and many lights could be on at the same time. Then the electric demand could easily exceed 10 kilowatts.