Carlisle Energy Blog

Carlisle Energy Solutions is based on the two-fold agenda of increasing energy efficiencies while driving down costs for cold storage warehouses, whose main products include produce, meat, seafood, and dairy.

Call Us Today To Find Out How We Can Save You Money 1-800-419-6157

Calculating Cost of Electric Defrost Heaters vs. Costs of 2 Fan Motors Running 24/7

November 23, 2015 - , - 0 Comments

Step 1: Operating Costs of the Defrost Heaters

The evaporator coil has 6 face heaters. Each face heater consumes 1,824 watts. There is also one drain pan heater that draws 736 watts.

Heater Power:

(6 face heaters x 1,824 watts’/face heater) + (1 drain pan heater x 736 watts/drain pan heater) = 11,680 watts

The defrost clock runs 4 times a day, in 15 minute cycles. That’s a total run-time of 60 minutes a day. We can now use the total watts to calculate the energy consumption in watt-hours.

Heater Consumption:

11,680 watts * (1 hour) = 11.68 kWh per day = 355.3 kWh per month

The cost of electricity is $0.134 per kWh, so the true cost of the electric defrost heaters can be determined in the calculations below:

Heater operating cost:

355.3 kWh per month x ($0.134/kWh) = $47.61 per month

Step 2: Operating Cost of the (2) Fan Motors running 24/7

Fan motors power:

Volts per motor x Amps per motor x # of motors x Power factor (efficiency) x square root of three (for a 3-phase motor) = 460 Volts * 1 Amps * 2 * 0.83 * square root of 3 = 1,380 kW drawn by the fans

Fan motors consumption:

1,380 kW * 30.42 days/month = 1007 kWh per month = 12,089 kWh per year

The cost of electricity is $0.134 per kWh, so the true cost of the (2) fan motors running 24/7 can be determined below:

Fan motors operating cost = 12,089 kWh per year x ($0.134/kWh) = $134.99 per month


For more information on Carlisle Electronically Commuted (EC) Motors and Controllers and how Carlisle Energy can save you money, please contact us directly at (714) 684-1766.

Comments are closed here.

Find out more about our energy saving products and services

At Carlisle Energy, we offer our professional expertise to provide high-quality energy efficiency solutions for the cold storage industry. Each service we provide is designed specifically with your return on investment in mind. We aim to provide our customers not only with extensive information and premium solutions for their energy conservation efforts, but also an amazing service experience.

Contact Us Now!

Cooper's Cold Foods, Inc.
EG Meat Inc.
Field Fresh Foods
Family Tree Produce
Maui-Fresh International
Panda Produce
Quentin Meats
S.G.S Produce
Umina Brothers
Worldwide Produce
YW Produce