A commercial or home diesel generator can provide higher efficiencies and improved dependability in certain applications. Our diesel generator buyer’s guide will explain just what makes this fuel so powerful and how to make it work for you.
Diesel is a liquid fuel that ignites in an engine by heat and compression instead of spark and is used in various heavy pieces of equipment, like generators.
Compared to gas, diesel is oilier and has a higher boiling rate. By volume, diesel contains between 10-15% more energy, which translates to greater power and efficiency.
A generator diesel engine operates using the same four-stroke principles as a gas engine but differs in the combustion process:
The reason diesel generator engines don’t require a spark plug to ignite the air/fuel mixture is because the air is compressed much more than in a gas engine. The tighter the air is compressed, the hotter it gets.
The level of compression is measured by the compression ratio. An engine compression ratio is the ratio of the maximum to minimum volume in the cylinder. In other words, how much space is in the cylinder when the piston is at the very bottom versus how much space is there when the piston is at the very top.
The other big difference between gas and diesel engines is in how the fuel is added. In carbureted gasoline engines, the intake valve releases air/fuel into the cylinder as a mixture. Diesel engines, like fuel-injected gas engines, inject the fuel right before the power stroke when the air has been compressed.
Because the air is packed together so tightly at this point, the fuel molecules can react with more oxygen, resulting in more power. This also results in greater fuel efficiency than in a gas engine.
With its higher power output and greater efficiency, a diesel generator is better suited for high-demand or remote applications than gas.
Diesel generators are larger and more robust than gas generators in order to handle the higher power loads. These engines are almost always liquid-cooled rather than air-cooled.
In terms of price, diesel generators tend to cost more, mainly due to their larger, liquid-cooled engines. Less overall maintenance is required for diesel generators, but, when it is required, tends to be more expensive.
| Diesel Generators | Gas Generators |
|---|---|
| | |
| More Power | Less Power |
| Higher Fuel Efficiency | Lower Fuel Efficiency |
| Larger | More Compact |
| Mostly Liquid-Cooled | Mostly Air-Cooled |
| Less Overall Maintenance | More Overall Maintenance |
| More Expensive | Less Expensive |
Commercial applications tend to use diesel generators more often than residential ones. They are common in the mining, construction, marine, and telecommunications industries due to their rugged build and power.
The fuel and maintenance savings are also popular among commercial owners, who often put their generators under the strain of heavy, long-term use. A diesel generator is the undisputed better option for commercial applications.
Homeowners have often stayed away from diesel because they associate it with toxicity and noise. However, newer diesel engines are becoming quieter, and their toxic emissions are comparable to those of gasoline.
Diesel is also less flammable than gasoline and safer to store. During emergency situations like hurricanes or earthquakes, diesel may also be easier to obtain--and that's when you would need your generator the most.
Finally, remote homeowners who aren't connected to a natural gas line might need a diesel generator. There are even smaller units for those who would like a portable diesel generator, such as hunters in a lodge.
Diesel generators give you more available power to get the job done, and you don't even have to be a truck driver.
If you have any questions about picking a diesel generator, please give us a call at 1 (800) 800-3317.