average fridge wattage
Average Wattage. An average 21-cubic-foot side-by-side refrigerator-freezer demands about 780 watts when in operation. Once you know the wattage demanded by your refrigerator, you can figure out how much the refrigerator costs to run.ultiply watts of demand by the number of hours per day an appliance is used and divide the result by 1,000 to get kilowatt-hours. Because refrigerators cycle on and off all day and night, the U.S. Department of Energyâs rule of thumb is to assume eight hours of operating time per day.