What Size Generator Do You Need?

Determine What Size Generator You Need:

The electricity created by a generator is measured in voltage and watts. When choosing a generator, first determine your specific voltage needs and then you can pick a generator model that supplies enough wattage for everything you want it to run.

Generator Voltage:

Voltage is a measure of the "pressure" of an electric current. In the U.S., standard household current is single phase, 120 volts. Most houses have 120/240v service, meaning they have two 120v circuits that combine to provide 240v for power-hungry appliances such as electric ranges, central air conditioning, and water pumps. Many small businesses use this 120/240v service and can take advantage of 120/240v generators. Larger businesses often have different power needs and use three-phase power, which better runs heavy-duty motors than residential-standard single-phase service. In the U.S., three-phase power usually produces 120/208 volts or 277/480 volts and you can find 120/208v generators and 277/480v generators that handle these common voltages. Know what voltages your business uses now so that you can find a generator to match.


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