Diesel Generator Key Terms

Learn about diesel generators and keep the lights on when power goes out

Whether you need portable power at a job site, need to ensure an uninterrupted supply of power at a manufacturing plant or just want backup for when the lights go out at home or at work, learning diesel generator key terms will help you choose your generator wisely. Modern diesel generators are much quieter and more efficient than they were in years past and, as we rely more and more on electricity, more people and businesses are choosing diesel generators to back them up when the power goes out.

Watts or kilowatts

Diesel generators are rated by watts (W) or kilowatts (kW). Make sure that your generator is powerful enough to meet your needs, but don't buy one that is too big, as under utilization can damage the generator.

Run time

Run time is how long the generator's fuel will last at capacity. To increase your run time, choose a generator with a larger fuel tank or a smaller generator with the same-sized fuel tank.

Utility or mains frequency

The utility or mains frequency is the frequency in Hertz (Hz) at which power is supplied from power plants to consumers. Although the frequency in most of the world is 50 Hertz, the frequency in the U.S. is 60 Hertz. Unless your equipment is designed to run at both 50 and 60 Hertz, make sure you buy a generator that matches the utility frequency in your part of the world.

Standby generator

If you can't afford a second of downtime, you can buy a diesel generator that automatically kicks in when the main power goes out. These standby generators are usually larger than portable generators because they're intended to power entire buildings or critical systems such as elevators.

Trailer-mounted or towable

Trailer-mounted, or towable, diesel generators are designed to be towed by a truck to a worksite. They are commonly used in construction and are popular rentals.

Emergency or portable

Emergency, or portable diesel generators, are used most often by homeowners or small businesses in the event of an unexpected power outage. Portable generators are usually small enough to be moved by one person and have wheels for added convenience.

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