For emergency situations, a diesel generator is generally considered the best due to its reliability and efficiency. Diesel generators can run longer, are more fuel efficient and have a longer lifespan than gasoline generators. They are well suited to providing power during extended outages and can handle larger loads, making them ideal for mission-critical applications.
The choice between diesel and gasoline generators depends on specific needs and usage scenarios.
Diesel generators are often preferred for their durability, energy efficiency, and ability to handle higher power loads, especially in industrial and continuous use cases. Gasoline generators, on the other hand, may be more suitable for smaller, portable applications or situations where lower upfront costs and simpler maintenance are priorities.
Diesel fuel can last much longer in a backup generator than gasoline. Diesel has a higher energy density and a longer storage life.
In general, diesel can be stored for 6 to 12 months or more without significant degradation, provided it is kept in a container and under appropriate storage conditions. Regular maintenance and fuel treatment may be necessary to ensure its effectiveness over long periods of time.
The power required for a backup generator depends on the essential loads that must be supported. A typical home backup generator should have an output of at least 5 to 10 kilowatts to cover essential appliances such as refrigerators, lights and heating systems.
For larger facilities or businesses, generators of 20 kilowatts or more may be needed to cover additional equipment and larger electrical needs.
A diesel backup generator generally cannot run on fuel oil. Diesel and fuel oil are similar but not identical in their formulation and additives. Although fuel oil can be used in some diesel engines with modifications, it is generally not recommended due to potential differences in lubrication and combustion properties. For optimal performance and to avoid damage, it is best to use diesel fuel as specified by the generator manufacturer.