Depending on their wattage output, a portable generator will run anything from a small lamp to a number of large appliances. To determine the size generator you will need, add the wattage of the maximum number of items you will be running simultaneously. For items with start up ratings higher than their run ratings, use the higher rating to determine your power requirements.
Inductive load appliances and tools such as refrigerators, washers, and power tools require additional wattage for starting. The initial load only lasts for a few seconds, but is very important when calculating your total wattage. For example – Running a 100 watt light bulb, a 1,200 watt refrigerator with a start-up wattage of 3,000 watts, and a 400 watt TV, would require 3,500 watts.
| Appliance or Tool | Running Wattage* | Startup (Surge) Wattage* |
| 3/8″ hand drill | 500 | 750 |
| Jigsaw | 600 | 900 |
| 7 1/4″ circular saw | 1500 | 1900 |
| Portable heater | 1500 | 1800 |
| Belt sander | 1200 | 1700 |
| Furnace fan | 1100 | 2000 |
| Refrigerator / Freezer | 1200 | 3000 |
| Clothes washer | 1000 | 7500 |
| Light bulb | 75 | 0 |
| Television | 400 | 0 |
| Microwave | 750 | 0 |
| Toaster oven | 1500 | 0 |
| Water heater | 5000 | 0 |
| Coffeemaker | 1200 | 0 |
| * Wattage numbers are estimates. They will vary based on the wattage rating of the tool or appliance being used. | ||
Electric Generator Safety Tips
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Never exceed the rated capacity of a generator.
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Always start the largest electric appliance first, then plug in other items, one at a time.
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Grounding the generator is recommended to help prevent accidental electrical shock.
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Choose the appropriate extension cord for the tool or appliance. Larger gauge, three-wire/three prong cords should be used when using an appliance or tool at a considerable distance from the generator.
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Never use a generator indoors or in attached garages.
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Only operate the generator outdoors in a well-ventilated, dry area, away from air intakes to the home, and protected from direct exposure to rain and snow, preferably under a canopy, open shed, or carport.
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Plug individual appliances into the generator using heavy duty, outdoor rated cords with a wire gauge adequate for the appliance load.
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Observe the generator manufacturer’s instructions for safe operation.
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Do not plug the generator into a wall outlet.
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If connecting the generator into the house wiring is necessary, have a qualified electrician hook up the standby electrical system, or have the local utility install a linking device if available.
Never store gasoline in the home. Gasoline, kerosene and other flammable liquids should be stored outside of living areas in properly labeled, non-glass safety containers. They should also not be stored in a garage if a fuel-burning appliance is in the garage. The vapor from gasoline can travel invisibly along the ground and be ignited by pilot lights or arcs caused by activating electric switches.
