Learn about different types of generators and how to choose the right one for your needs.
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What is a generator?
An electric generator helps supply power if utility power is lost for an extended period of time. While a portable generator is rugged and dependable, its power can be significantly lower in voltage and frequency regulation than utility power.
There are two types of generators:
- A portable generator is the most common choice for home use. Most portable generators are “plug and play.” That is, you can install the equipment yourself.
- A stationary generator is connected to your home wiring and requires the services of an electrical contractor for installation. This option is the best choice for people who need to keep life-safety equipment powered at all times. For specifics, contact the
PGE Power Quality Hotline 503-736-5750 or 800-270-7016, or e-mail us.
If you will use your generator to operate an appliance with a large motor, you may need to install a power conditioning device such as an uninterruptible power supply at sensitive appliances. Check the manufacturer’s specifications for details.
It is also important to know that the National Electric Code requires a transfer switch be installed if you use a generator to power some loads in your home.
Selecting the right generator
To make sure you get the right generator for your needs, look for products that meet these specifications.
Key purchasing considerations for portable generators:
- Valve location
Overhead valves enable engines to last longer than engines with side-mounted valves.
- Run time
Run time is usually specified at one-half load. More loading means less run time.
- Starting method
Compression release on pull-start models makes starting easier.
- Low-oil warning
Auto shutdown feature prevents damage to engine when the oil is low.
- Spark arrester
A spark arrester should be used when the generator is located near combustibles.
- AC voltage
120/240-volt generators can power 240-volt appliances such as AC units and clothes dryers.
- AC outlets
Twist-lock outlets provide a more reliable connection to the generator.
Common questions about generators
Q. How large a generator should I invest in?
- That depends on how much equipment you need to operate during a power outage. For assistance in sizing
a generator, call the Power Quality Hotline at 503-736-5750 or 800-270-7016.
Q. What should I do about my life-safety equipment that needs constant power?
- A stationary, or permanently installed generator, is your best choice.
After an outage, it can restore power in seconds and support all loads as long as needed.
Q. Will all of my equipment run properly when powered from a generator?
- Newer generators feature electronic governors, which can regulate voltage to plus or minus 6 percent of
nominal or better. Most equipment should work with this type of voltage regulation.
Q. How can I use my home generator to power lights in my home or my electric water heater?
- To power circuits in your home safely, you need the right switch. You can choose an electrician-installed transfer switch, which will cost $500 to $800. Never plug your generator directly into an outlet in your home. You can
overload your electrical circuits and cause a fire or some of the power you generate can backfeed into PGE’s utility lines, putting our repair personnel at risk of injury.
For more information, contact an electrical contractor, PGE’s Power Quality Hotline at 503-736-5750 or 800-270-7016, or e-mail us.
