how long do generators run: what you need to know

September 12, 2024
By BISON

As the storm rages, lights flicker and then go out in homes across the city. Generators are handy machines to have on hand in case of an emergency. At BISON, we understand that when the power goes out, every minute counts.

Knowing how long a generator can run means understanding how long food can stay fresh, how long medical equipment can operate, or how long a business can continue to operate during a prolonged power outage.

In this article, BISON will dive into everything you need to know about how long a generator runs, helping you choose between generators with different run times. Whether you’re a homeowner looking for backup power or a business owner ensuring continuity, mastering the concept of generator run time is critical to your preparedness strategy.

Generator types and their typical run times

Understanding the run times of different types of generators is essential to choosing the right model for your specific needs. At BISON, we offer a variety of generators to meet different power needs. Let’s explore the various categories:

Portable generators

Portable generators are versatile solutions designed for short-term power needs and mobility. They are ideal for:

Short-term power outages
Recreational use (running small appliances during small outdoor activities such as camping, tailgating, etc.)
Home emergency backup

The run time of a portable generator can vary based on fuel capacity and load, but most models in our product line provide 8-12 hours of run time on a full tank under standard load conditions. This duration ensures that you have enough power to survive most short-term power outages or enjoy a full day of outdoor activities without interruption.

Inverter generators

Popular for their clean, steady power output, inverter generators are ideal for:

Powering sensitive electronic equipment
Camping and outdoor recreation
RV or boat travel

Thanks to advanced fuel efficiency technology, BISON’s inverter generators typically provide longer run times than traditional portable models. Under normal load conditions, most units in our inverter series can run for 10-16 hours on just one tank of fuel. This extended run time, combined with their quiet performance, makes them ideal for overnight use in camping scenarios or for long periods of power in noise-sensitive environments.

Whole house or home standby generators

More power efficient and larger than portable generators, these units are designed to plug directly into your home’s electrical system and automatically turn on when the power goes out. With outputs ranging from 10 kW or more, these units are designed to:

Automatically restore power during a power outage
Long-term emergency power
Protect critical systems and appliances

BISON’s standby generators are designed for extended operation during extended power outages. When connected to a continuous fuel supply, such as a natural gas line or large propane tank, these units can run indefinitely.

Maintenance is still required, and BISON recommends oil changes and other maintenance at least every 2-3 weeks. Therefore, you must interrupt the continuous operation of the standby generator every once in a while.

Industrial generator

Our line of industrial generator is designed to meet the most demanding power requirements. For large-scale and critical power needs, our industrial generators offer unmatched performance. Equipped with advanced cooling systems and powerful engines, they can provide uninterrupted power for weeks or even months when properly maintained and fueled.

Factors that affect generator run time

Understanding the various factors that affect generator run time is essential to choosing the right generator. We have identified several key factors that play an important role in generator run time:

Fuel type

Fuel keeps your generator running and can significantly affect the running time of your generator.

Gasoline: Gasoline is commonly used in portable generators and is readily available and easy to use. However, it has a shorter shelf life and can be less efficient than other fuel types.
Diesel: Known for its efficiency and durability, diesel is often used in larger generators and is the most cost-effective option
Propane: This clean-burning fuel is an excellent choice for those concerned about emissions. And with their longer fuel storage life, they are also safer than gasoline.
Natural gas: Natural gas is another cost-effective option that is also environmentally friendly. A continuous supply of fuel is provided through utility lines, allowing for indefinite running time during power outages.

Fuel management

Proper fuel management is essential to achieve optimal performance and lifespan of your generator.

Store fuel in approved containers in a cool, dry place away from living areas.
Use gasoline and diesel fuel stabilizers to extend shelf life and prevent spoilage.
Fuel additives can improve fuel efficiency by cleaning the fuel system and improving combustion.
For propane and natural gas systems, schedule regular inspections of fuel lines and connections.

Fuel tank capacity

The size of a generator’s fuel tank is related to its potential running time.

Run time = fuel capacity ÷ fuel consumption rate

Fuel consumption rates vary based on load, generator efficiency, and environmental factors. However, larger fuel tanks allow for longer running times without refueling. You need to consider the tradeoff between the size of your generator’s tank and its portability.

Load

Understanding and managing electrical load is critical to optimizing generator run time. Load refers to the total amount of electricity drawn from the generator in each period. Higher electrical loads consume fuel more quickly, reducing total run time. Starting (surge) power from appliances temporarily increases load, affecting fuel consumption.

You need to perform accurate load calculations to select the right generator size for your needs. Prioritize essential appliances and stagger the start times of high-power appliances to manage load effectively.

Generator size (generator power output)

Once you understand the load, it’s important to understand that choosing the right generator size is critical to balancing power needs and run time.

An oversized generator can waste fuel when operating at light loads. An undersized generator can struggle to handle heavy loads, leading to inefficiency and potential damage. Running the generator at a load close to its rated capacity will ensure maximum fuel efficiency. Our experts can help you determine the ideal generator size based on your specific power needs.

Maintenance

Over time, generators wear out and consume fuel at a faster rate than expected. Regular maintenance is key to ensuring optimal performance and extended run time:

Follow the manufacturer’s recommended maintenance intervals.
Clean or replace the air filter, change the oil, and oil filter, check the spark plugs, and tune up the engine regularly
Keep the generator clean and free of debris.
Check the coolant level to prevent overheating
Tighten any loose connections.

Environmental conditions

External factors can significantly affect generator performance and run time:

Temperature: Extreme heat or cold can affect engine efficiency and fuel consumption.
Altitude: High altitudes can reduce engine power output and efficiency.
Humidity: High humidity levels can affect air intake and combustion efficiency.

Contact now

In this article, we explore the key factors that influence generator run time. BISON use this deep understanding to revolutionize generator technology.

Our proprietary engine design optimizes fuel consumption on a variety of fuel types, providing up to 30% longer run time compared to standard models.
Integrated load sensing technology automatically adjusts engine output to meet demand, maximizing efficiency and extending run time.
We offer customized fuel tank options that increase potential run time.
Our generators feature advanced cooling systems and altitude compensation technology to ensure consistent performance in varying environmental conditions.
AVRs can maintain constant voltage output and protect the generator from fluctuations. This can improve fuel efficiency by reducing the load on the generator.

Schedule a consultation with our generator experts today to evaluate your specific needs. BISON provides reliable generators. Ranging from 2,300 watts to 15,000 watts, our generators are portable and come with large fuel tanks to help you get through the night.

FAQs

How long can a generator run continuously?

For the life of a portable generator, it is expected to run for at least 500 hours. But this does not mean that they can be used continuously. Generally speaking, portable generators can only run continuously for a short period of time (6 to 18 hours), depending on the model.

When the generator is operated beyond the running time, heat buildup is also essential. The generator will only produce moderate overheating in 12-24 hours. However, once it is used continuously for more than 24 hours, the generator will be at risk of overheating, causing permanent damage.

If you run the generator in hot weather, use a fan to cool the engine or use other methods to keep the engine cool. In addition, running the generator at a higher wattage will generate more heat.

how long do generators run: what you need to know

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