When it comes to having a steady, reliable power supply – no matter what the conditions – diesel generators are great options for many industries. But how long can a diesel generator run continuously? The good news is that the continuous operation time of a diesel generator set is unlimited. However, continuous operation does not always mean you should run your generator at max capacity! If you run your generator at heavy load for a longer period, you will need to allow a period of appropriate idling to give it a rest.
As a general rule of thumb, a diesel generator set can operate for 8–24 hours according to the size of the fuel tank, power output, and power load. This is not a problem during a short blackout or brief power outage. However, for a long-term emergency, you may need a larger fuel tank or the ability to regularly refuel your generator tank.
Is It Safe To Run A Diesel Generator Long Term?
Although we have discussed how long diesel generators can run continuously, there are also some risks associated with doing so. The longer a generator operates, the more heat it generates. Under average conditions, there is little possibility of permanent damage. However, if a generator runs continuously for more than 12 hours at a temperature above 104 ° F, it may overheat and sustain some damage.
To keep your diesel generator running smoothly, daily maintenance is important. Even if a generator can run for several weeks at a time, you need to change the oil frequently and perform basic maintenance. Regular oil changes will maximize power output, reduce wear, and prolong the life of your generator. In addition to routine maintenance, your generator should undergo professional inspection and maintenance at least once a year to identify any minor problems and resolve them before they develop into larger problems.
Generator Type, Fuel Source, And Run Time
There are two main types of diesel generators: standby and portable generators. Both are designed to help you keep lights on during a power outage; however, not all generators can be left running for days at a time.
- Standby generators – a standby generator is a stationary electricity source designed to provide power to residential or commercial buildings for up to several days depending on its size, fuel source, and brand. Unlike emergency short-term generators, standby generators are made specifically for use in longer-span emergencies and are permanently installed. Standby generators come in various sizes and types. Each one has a different run time based on these two factors.
- Portable generators – portable generators can run up to 2,000 total hours. Unlike standby generators, portable generators are designed to run for 6 – 18 hours. While they have their application in an emergency, they are not recommended for use during long-term power outages or in off-grid situations where a generator is the main power source.
The type of fuel you use to run your generator also affects its run time. A generator can continue running as long as it has fuel to do so. However, it may be more difficult to replenish your fuel supply during a natural disaster or other emergencies. Most generators run on the following two fuel sources:
- Diesel – diesel generators can be resourceful, although the amount of diesel is limited to the amount you can access and store in a tank at any one time. Diesel gas can also be expensive, especially when you factor in delivery and storage charges.
- Natural gas – natural gas generators connect directly to your gas line, so there is no need for a fuel tank or to worry about fuel storage. Natural gas generators can run continuously if gas lines are operating. However, during a natural disaster, this option may not be available, as gas lines will be shut off to mitigate the risk of fire or other hazards.
Dual-Fuel Generators: A Practical Solution
Natural gas/diesel generators combine the best aspects of each generator mentioned above. These dual-fuel generators combine diesel fuel’s power with the longevity of natural gas. If natural gas is not available during an emergency, the generator seamlessly switches over to diesel fuel. This innovative solution allows industrial operators to maintain their workflow during power interruptions and safeguards against potential revenue losses and disruptions to productivity. The ability of these generators to switch between both fuels allows companies to rely on the most readily available and cost-effective option at any given time.
The Pros And Cons of Natural Gas/Diesel Generators
The main advantage of dual-fuel generators is that they offer the ability to use the fuel option that makes the most sense at any given time. Certain fuels perform better in specific circumstances or are more readily available at different times. Other benefits to consider with these combined natural gas/diesel generators include:
- Fuel flexibility – dual fuel generators allow operators to choose between diesel or natural gas, depending on the availability and cost-effectiveness of these fuels.
- Extended run time – the ability to switch between fuels results in extended run times, which is critical during extended power outages.
- Reduced maintenance – natural gas/diesel generators often require less maintenance due to the cleaner-burning natural gas.
- Environmental considerations – burning natural gas reduces emissions, making dual-fuel generators a greener energy solution.
However, there are a few factors to consider before purchasing a generator that can switch between these two fuels.
- Initial cost – dual fuel generators tend to be more expensive upfront compared to single-fuel alternatives.
- Fuel storage challenges – storing diesel fuel safely (and to avoid contamination) can be complex and requires careful consideration.
- Difficulty to operate – dual-fuel generators are more complex to operate than single-fuel generators.
- Complex maintenance – a generator with a dual fuel system can be more intricate to maintain and may require specialized knowledge.
- Noise and emissions – when running on diesel fuel, these generators may produce more noise and emissions than when they are running off of natural gas.
What To Know Before You Purchase A Generator
Whether you are considering an industrial diesel generator or a natural gas/diesel generator, the initial cost can be daunting. Not only is the price tag high; but you also have to consider routine maintenance costs to ensure you keep your investment in top operating condition. If you are suffering from sticker shock, one option is to consider diesel generator rentals.
You can rent a generator for a pre-determined amount of time, for a specific job, or even in an emergency. If you need to keep your operations going during an unplanned outage, many companies offer emergency diesel generator rentals. These generators are ready to deploy at a moment’s notice when disaster strikes. Renting a generator, whether for a planned job or during an emergency, can be a good, temporary solution to hold your business over until you are ready to talk to a reputable retailer about purchasing one.
