3/1/17
Revised: 8/31/22
Grainger Editorial Staff
Blackouts. Brownouts. Permanent faults. These power outages can wreak havoc on warehouses, jobsites, healthcare facilities and more. They can delay important work and increase risks during times of temperature extremes. Worst of all is when power outages occur during electrically powered medical procedures. That's where electric generators come in.
Electric generators are backup power sources that convert fuel supply — gasoline, diesel, propane or natural gas — into electrical energy. They are the primary sources of electrical supply during power outages.
There are three main types of generators: portable, inverter and standby. Portable and inverter generators can power various types of tools and appliances on location. Select the size you need based on the running wattage of the items you will connect to them, as well as the surge wattage for starting them. Standby generators are different from the other two kinds; they are backups for residential, commercial and industrial electrical systems. Similar safety precautions should be taken to reduce the hazards posed by the operation of all types.
Here are some characteristics to note about conventional portable generators:
Here are some common characteristics of inverter generators:
A standby generator is an electrical system that operates with a transfer switch that commands it to operate automatically when a facility loses power.
Here are some characteristics to note about these types of generators:
Maintaining a portable or inverter generator powered by gasoline or diesel fuel is not unlike maintaining a mower or snowblower. Follow the manufacturer’s recommendations for timing of the different operations, but typical tasks will include:
Beyond that, if the generator has ground fault circuit interrupter (GFCI) outlets, test them regularly, according to manufacturer’s specifications. GFCI testers are tools that can help.
Some models also have batteries that will charge while the generator is running. If the generator does not operate regularly, a trickle charger or battery maintainer can help re-charge it.
Standby generators are a little more complex than portable or inverter generators. There are some tasks owners can perform and they fall into the type of maintenance common for small engines, such as checking oil, the battery, coolant levels, belts and spark plugs. You may want a certified technician to perform more involved tasks, including testing and servicing the automatic transfer switch that is critical to getting power the main source goes out.
Keep records of inspections, tests and repairs. These records will allow you to understand when further repair or replacement may be necessary.
The information contained in this article is intended for general information purposes only and is based on information available as of the initial date of publication. No representation is made that the information or references are complete or remain current. This article is not a substitute for review of current applicable government regulations, industry standards, or other standards specific to your business and/or activities and should not be construed as legal advice or opinion. Readers with specific questions should refer to the applicable standards or consult with an attorney.
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