Getting standby generator ratings can be a good idea, if you’re thinking about purchasing a generator for your home. They can help you determine if you need to spend a lot of money on a generator, or if you can save money by buying a cheaper unit.
Limitations on run time
Whether you’re looking to purchase a standby generator set, cogeneration, or other limited run time rating, it’s important to know the limits. There are some very clear limits, but there are also some subtle differences in ratings definitions from manufacturer to manufacturer.
There are several critical parameters that define generator ratings, including the size of the load in kW and kVA, the voltage, frequency, and phase requirements, and the capacity of spare capacity for future loads. It’s important to understand the limitations of these ratings and to select the proper size generator set for your application.
The limit of time allowed for a standby generator set is generally 200 hours per year. If you choose to use an emergency standby power (ESP) rated generator set, the limit is slightly higher. ESP-rated generator sets have the same output and load characteristics as standby generators, but are rated to run at 70 percent of the load factor for up to 200 hours per year.
Limitations on base load
Whether you’re in the market for a new generator, or are simply looking for information about standby generator ratings, there are several key things you should know. You should also know that the ratings that you choose will depend on the type of application and load.
The first thing to know is that standby generator ratings are typically limited to a number of hours per year. The number of hours will vary depending on the type of load. For example, in the case of a residential generator, a generator can be sized for approximately 250 hours of use per year. However, in a commercial facility, the number of hours that a generator will be used will depend on the needs of the building.
As a general rule, you should select a generator with a standby rating that is sufficient to meet your needs. This is typically defined as a capacity of at least 70% of the rated output.
Overloading a generator
Having a standby generator is important for homes and businesses that rely on electricity. However, they can be dangerous in bad weather, especially if they overload. The NEC (National Electrical Code) requires generators to have overload protection.
Generators with overload protection are usually microprocessor-based and come with a special control scheme that offers inherent protection. They are also programmed with an over-current protection curve. This means that, when an overload occurs, a circuit breaker automatically shuts down.
The same type of control system also has a summing algorithm that compares a sensed RMS current to the stored protection curve. It also provides selective coordination with downstream protective devices, like switches and fuses. This is important when there are standards or design constraints to consider.
The ol’ overload indicator light is not only a sign of overload, but it also demonstrates the function of the corresponding circuit breaker. It is an important part of the power grid, and when used properly, it can ensure that your house is never without power.
Maintenance of a standby generator
Ensure your standby generator’s reliability and safety by following a maintenance plan. These tasks will improve the system’s performance and extend its service life.
First, you should know how to perform basic maintenance tasks on your generator. The NFPA 110 Standard for Emergency and Standby Power Systems is an excellent reference for general maintenance requirements. It contains a suggested maintenance schedule and provides detailed information on specific maintenance items.
Next, you should have your generator serviced twice a year by qualified technicians. They can perform regular maintenance tasks and handle more advanced tasks.
The frequency of maintenance depends on the size of your generator, the number of hours it is used, and the local weather. If your standby generator is located in a harsh environment, it will require more frequent service. This can be as often as every three months.
Maintenance should include a visual inspection of the generator’s interior. Make sure that there are no loose wire connections, and that the electrical panels are clean. Also, ensure that the housing is dry.