To calculate the system's approximate operating costs, multiply the total kilowatts of the system by the cost per kilowatt in your area. Let's use the example of a 350 sq. ft. of concrete patio (residential application), with 240 VAC.
To determine Total Watts: multiply area in sq. ft. x 50 Watts
350 x 50 = 17,500 Total Watts
To arrive at Kilowatts (the unit in we purchase electricity): take the Total Watts and divide by 1000
17,500 Total Watts / 1000 = 17.5 Kilowatts.
To determine Kilowatt rate: use the national average of .12 cents per Kilowatt-hours so how much do we pay for 17.5 kWatts?
17.5 kW x .12 = $2.10 for every full hour of operation.
How many hours would you operate the system? We use a typical 6 hour snowfall for our example so
$2.10 x 6 hours = $12.60 for that snowfall.
All of this will vary due to "after-run time". "After run time" is where the system remains on extra hours after the snow has completed falling, to ensure complete pavement snow melting and drying.