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reactive load examples...

Reactive loads can cause some confusion. Typically, a reactive load contains an electric motor. This type of load may require from three to six times as much power (wattage) to start as it does to keep it running. Examples of reactive type loads are air conditioners, refrigerators, well pumps, bench grinders, air compressors, etc.
Motors require additional power and current when initially turned on because the rotor of the motor and the shaft driven load (fan, pump, compressor, saw, etc.) is initially at a standstill. It requires more energy to accelerate these rotating parts to operating speed than it does to keep them rotating. Therefore, during the period of acceleration, the demand on the power supply is greater. It is the ‘starting’ wattage value that we use to calculate the power requirement for reactive loads.

The power required to run an air conditioner is commonly measured in BTU’s (British thermal units). To convert BTU’s to kW; 3413 BTU’s = 1kW.

Please... no emails pointing out that these values don't match those of your own appliances... we know; they are provided as a rough guide only and may differ from the actual power requirement of your household appliances. If you can get nameplate data from your appliances, your calculations will be more accurate.

Appliance Running Watts Starting Watts Appliance Running Watts Starting Watts
Air Conditioner / BTU's by 3413 for kW kW value x 2 Air Compressor 2hp 2800 7700
Clothes Dryer Clothes Dryer 750 1850 Drill 1/2" 600 900
Freezer 700 2200 Impact Wrench 1/2" 750 1200
Microwave 625 800 Circular Saw 7 1/4" 1400 2300
Refrigerator 700 2200 Table Saw 9" 1500 3000
Well Pump 1/3 hp 800 1300 Pressure Washer 1hp 1200 3600
Well Pump 1/2 hp 900 2000 Induction Motors
Well Pump 3/4 hp 1500 3000 1/3 hp 720 1300
Well Pump 1 hp 2000 4000 1/2 hp 975 2100
Well Pump 3 hp 5000 10000 3/4 hp 1400 3100
Well Pump 5 hp 7500 15000 1 hp 1600 4500
Washer/Dryer 2000 3000 2 hp 2850 7700
Water Heater 2000 3000 5 hp 6800 16500
Air Compressor 1/2 hp 1000 2000 Fan Motor 1/8 hp 400 600
Air Compressor 1 hp 1500 4500
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