You just multiply the number of volts by the number of amperes. In the case of an electric appliance such as a box fan, you determine its energy use or power by looking at its wattage. Moreover, since it doesn’t use that much energy, it’s great for the environment as well as for your pocket. Appliances are said to "draw amps," referring to the amount of electrical current required to run them. Most other countries use 240 volts instead of 120, so outside of North America and Japan use 240 instead of 120 in your calculations.) The amperage draw of the Fan-Tastic Vent Endless Breeze Portable Box Fan w/ Hanging Brackets # FV01100WH is listed in amp-hours. Amps is equivalent to watts divided by volts, so 0.35(906)/120=2.6425 amps. 120 x 15 = 1,800. With 3 quiet speeds, Save-Smart® energy efficiency (costs less than 2¢ per hour to operate), and easy-to-use top mounted controls, this classic box fan from Lasko is an excellent choice for any indoor space that needs increased airflow. How Many Watts Do You Need? One amp drawn by a ceiling fan is equivalent to about 120 watts. Fans range in size from 36 inches to 56 inches using 55 to 100 watts, a typical 48 inch ceiling fan will use 75 watts. Air Circulating Box Fan Model 3733 With 3 quiet speeds, Save-Smart® energy efficiency (costs less than 2¢ per hour to operate), and easy-to-use top mounted controls, this classic box fan from Lasko is an excellent choice for any indoor space that needs increased airflow. By comparison our band used to run a full PA at bars at 1200 watts. varies from 11 watts (low power) to 16 watts (high) Power Use. Are you having trouble splitting the electricity bill as a landlord or tenant? In most cases, the exact amp usage of a ceiling fan will be known by the fan's manufacturer. So guessing somewhere between 4-8 hours out of 24 = 11 – 22 amps/day if in use. We’re going to tell you exactly how much power a box fan uses and how much it costs to run. Simply divide the number of watts by a thousand. A 1500 Watt heater will cost the same to run whether it is 120 or 240 Volt. You might be thinking of buying a box fan or you might already have one but don’t know it’s power consumption. At their highest setting, our heaters use a maximum 1500 watts of electricity, drawing 12.5 amps. Therefore, it runs on 0.1 kWh. So a true 2000cfm fan should be pulling around 20 amps. For instance, if your box fan runs on 100 watts per hour, just divide that by 1000. However, we advise that you remove your product from the window during heavy inclement weather as powerful winds … I think the woman is crazy and will be happy to get moved out of her house next week. This information is usually found on the back of the appliance or on a tag affixed to the cord. Fan power consumption is based on the mode in which the fan operates. It makes for comparing electric fans a little easier and weeding out the false cfm ratings. Use our kW to amps calculator to solve for kilowatts. She will only use a few box fans. If you were to load the inverter to its maximum of 1500 Watts and consider an efficiency of around 80% you would be using about 156 Amps from a nominal 12 Volt source. Where is it made? To select an inverter from DonRowe.com that has enough power for your application, add the watts for items you may want to run at the same time. 175: Furnace Fan Blower - ⅓ HP: 700* Window AC - 12,000 BTU: 3250* Central AC - 10,000 BTU: 1500* Central AC - 24,000 BTU: 3800* Heat Pump: 4700 * Allow 2 times the listed running watts for starting these devices. Next, convert to kWh how many watts does a box fan use,if it uses 120 volts@1.1 amps? She refuses to leave the fans on during the day stating that it will "run her power bill up way too much" My question is how much energy will a box fan or two use? Use the total wattage, plus 20%, as your minimum power requirement. 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