How Does A Diesel Generator Produce Electricity?

Generator systems are useful appliances that supply electrical power during a power outage and prevent discontinuity of daily activities or disruption of business operations. Some power outages, such as power failures from national grids, are not predictable, which is why they are often relied on during power cuts, brownouts, or any other interruption to mains power.

How does a diesel generator work?

diesel generator converts mechanical energy into electrical power, using a combination of an electric generator and a diesel engine to generate electricity. The equipment converts the fuel into electrical energy, through the combustion of diesel. Their ability to provide standby power when the local electricity lines are down is second to none and can provide owners with both emotional reassurance, as well as the obvious direct benefits.

The main parts of a diesel generator

Every diesel generator is made up of nine different, but equally important, generator parts. Each of these is essential for the generator to run smoothly and to the best of its ability. The diesel generator parts include:


This is the source of mechanical energy and if you would like a generator output, then you need a bigger engine. The larger the power of the engine, the more electrical output you are able to produce.


This is the part of the generator that turns the mechanical energy into electrical power through induction. The alternator contains both moving and stationary parts that work together to create the electromagnetic field and movement of electrons that generates electricity.

Fuel System

The system includes a fuel tank, a fuel pump, a pipe connecting the tank to the engine, and a return pipe. This system makes it possible for the generator to produce the energy needed, where the diesel can be supplied directly to the engine. The size of the fuel tank ultimately dictates how long a generator can remain active for.

Voltage Regulator

Being the most complex part of an electric generator, this aspect of the machine regulates the voltage output. It ensures that the generator produces electricity at a nice steady voltage, preventing huge fluctuations of power that are dependent on how fast the engine is working.

Cooling & Exhaust Systems

The cooling system works to help prevent your generator from overheating, countering all the additional heat energy produced by the engine and alternator. The coolant then takes all this heat through a heat exchanger and gets rid of it outside the generator. Whereas, the exhaust system takes any gases produced by the diesel engine, brings them through a piping system, and exhausts them away from the generator.

Lubrication System

This component of the generator is attached to the engine and pumps oil through it to ensure all the parts work smoothly and don’t grind against one another.

Battery Charger

The battery charger is a fully automatic component that ensures the battery is ready to go when needed. It keeps the battery full of charge, either by an external source of the generator itself, supplying the generator with a constant low-level of voltage.

Control Panel

The control panel controls every aspect of generator operation from startup and running speed to outputs, being the main area where the generator is controlled and operated.

Main Assembly Frame

The main assembly frame houses the generator and is where all the different parts are built onto. It ensures that all the electrical components are safely grounded, and many outdoor generators are typically housed in a protective frame that is weatherproof to prevent any potential damage from the elements.

What kind of maintenance does a generator require?

Generator maintenance is incredibly important, as it always guarantees that the machine is operating properly. Generators can last for decades when properly maintained, so the investment of a decent generator service is very beneficial in the long run.

Here at Vital Power, we provide our clients with exceptional generator maintenance contracts that are available across the UK, accessible 24/7 and are tailored to individual customer needs. Therefore, you don’t need to worry about whether your diesel generator breaks down, day or night, as we can provide you with a diesel generator repair service at any time of the day.
As a business, we are complete experts in our field of work. If you would like to learn more about our services and inventory, be sure to visit our website for some in-depth information. On the other hand, please feel free to telephone us on +44 (0)1244 980690 and someone will be more than happy to have a conversation. We are certain that we can help you account for every consideration in your generator purchase, helping you choose the perfect machine for the job.