Diesel generator

Top & Best Diesel generator Review 2022 – How to Select Ultimate Buyer’s Guide

Diesel generator: What’s the best of 2022?

Whether at home, at work, on trips or during medical care, the fact is that electricity is essential. But what about when a power outage occurs? This is where the importance of generators comes in. And, among so many models, one deserves your attention: the diesel generator.

In today’s article, we’ll show you what to take into account when choosing the ideal diesel generator, whether for your home or business.

First, the most important

  • The diesel generator is essential equipment to ensure that electricity is never interrupted.
  • Because of diesel, this type of generator is fundamental in industries and commerce, but it can also be used in homes.
  • And since the variety of models is large, it is necessary to understand what differentiates one diesel generator from another.

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Buying Guide

When buying a diesel generator, you need to understand about its operation and the variables that differentiate one model from another. That’s because, today, there is an ideal generator for each objective.

Therefore, we have prepared this Buying Guide. Next, you will find out how and where to use a diesel generator, the price of this type of equipment and the best place to buy it.

What is a diesel power generator?

The generator is a device that provides energy without interruption to places and electronic devices when a blackout occurs.

But there are several generators that, among other factors, differ by the type of fuel they use to generate the necessary energy. One is the one that uses diesel.


The diesel generator provides energy without interruption.

The diesel generator provides energy without interruption. Therefore, it is most useful in homes, industries, small businesses, campgrounds, etc.

This is because the main characteristic of this type of generator is precisely diesel, which is more economical.

Diesel is also more efficient in supplying energy for long periods and not just when there is no light.

How does a diesel generator work?

The diesel generator works through a combustion engine, that is, it has an alternator that will transform the mechanical energy of the engine rotation into electrical energy.

In practice, the air inside the generator is pulled until it is compressed, so that the diesel is injected. With this combination, strong heat is generated, which leads to the combustion of diesel, making the generator run.

From this process, energy is generated and distributed to the devices connected to the generator.

What is the difference between the diesel, gasoline and gas generator?

As we have seen, a generator’s engine can run on different types of fuels. So it is important that you understand the difference between them.

In general, each fuel will be more or less efficient according to your use of the power generator.

For example, if you use the equipment only when there is no light at home, a gasoline generator may be the best option. But if the idea is to use the generator daily, the ideal model is the one that works on diesel.

This is because gasoline generators tend to be cheaper, quieter and less polluting.

On the other hand, the diesel generator is more economical, since the fuel is cheaper. It is also more durable than the gasoline-powered model.

In addition, there is the generator powered by natural gas, which is less used and even more expensive. This option emits far less polluting gases, but offers a greater risk of fire.

To illustrate the differences between the diesel generator and the others, we created the following table. Look:

Who is the diesel generator recommended for?

As we have seen, due to its robustness, power and efficiency, the diesel generator is indicated for those who need to use the equipment constantly.

Therefore, it is essential in industries, stores and malls, which can have serious losses if they run out of energy.

But as they can be used for hours, weeks or until the power supply returns, the diesel generator can also be used in homes and farms.

Where to install a diesel generator?

It is important to be careful when installing the generator. The main thing is not to leave the equipment indoors.

This is because, during its operation, the diesel generator emits toxic gases, which can be harmful to health. In ventilated places, the damage is less.

Did you know that it is necessary to carry out maintenance of power generators periodically?

This is important to ensure correct operation and to avoid possible failures.

What are the dangers of a diesel generator and how to protect yourself?

In addition to the care in the installation, to avoid poisoning, it is necessary to protect yourself from accidents, after all, diesel is a flammable fuel.

The fact is that it is possible for the diesel generator to cause electric shocks and explosions. To avoid accidents and protect yourself, follow the instructions:

    • Make sure that the motor is properly grounded to prevent electrical shock ;
    • Keep the diesel generator away from fuels or other flammable mixtures;
    • Do not touch the generator while it is running, even less if it or your hands are wet;
    • The equipment must not operate at maximum capacity ;
    • To avoid accidents, the energy generator must not exceed 20 ° of inclination;
    • The equipment must have the fuel tank isolated and the indicator lamps in operation.


What are the advantages of a diesel power generator?

One of the advantages of the diesel generator is the low cost of the fuel. In addition, this device is ideal for those who need efficient equipment that will work for long periods.

Another positive point is that this type of generator has a more durable structure, which further increases its cost-benefit ratio.

As it guarantees electricity for a longer time, the generator ensures that electronic devices and appliances, such as TV, radio, computer, refrigerator and microwave, continue to function without damage.

The biggest disadvantage of the diesel generator is the noise level emitted by the equipment and the emission of polluting gases.

To summarize the main advantages and disadvantages of a diesel generator, we have created the following table:

What is the price of the diesel generator and where to buy it?

The price of the diesel generator will depend on the make, size and technical specifications of the equipment. But, generally, it is possible to find models that cost between R $ 4 thousand and R $ 45 thousand.

You can buy a diesel power generator in specialized stores or in hypermarkets and department stores, such as Ponto Frio and Extra.

But the most practical option is to buy online, in stores like Amazon Brazil. With that, you find a greater variety of models and still buy from the comfort of home.


Purchasing Criteria: How to Compare Diesel Generators

Now that you know how a diesel generator works and what it is for, it’s time to find out what differentiates one model from another.

We have listed for you the main aspects that must be taken into account. Are they:

  • Voltage
  • Power and dimensioning
  • Single-phase, two-phase or three-phase
  • AVR
  • Tank and autonomy

From here, we will explain how to evaluate these items.


Check the voltage of the location where the diesel generator will be used. This is because the voltage of the equipment must be chosen according to the voltage of the devices that the generator will meet in the event of a blackout. When in doubt, choose the bivolt generator.

Power and dimensioning

Then, analyze the power of the diesel generator, measured in kVa (kilovolt ampere). To choose the ideal one you must calculate the dimensioning, which is how much is expected from the consumption of your generator.

To do so, follow the step by step below:

  • Make a list of all devices that can be connected to the generator;
  • Add the wattage (W) of all devices;
  • Divide the total power of the equipment by 1,000;
  • There, the result will tell you the required kVA value of the diesel generator .

For example: If you add 2 thousand Watts from a microwave, with 3 thousand Watts from an electric grill, 1 thousand Watts from an electric shower and 3.5 thousand Watts from a clothes dryer, the total of 9.5 thousand Watts divided by 1,000 will result in 9.5 kVA.

Remembering that the greater the generator power, the greater the fuel consumption.

Single-phase, two-phase or three-phase

Both voltage analysis and dimensioning are also important when choosing the diesel generator’s power supply mode, which can be mono, bi or three-phase.

In the single-phase generator, for example, the power supply is efficient only for networks with a maximum of 127 V and for a power of up to 8,000 watts.

The generator also varies according to its supply capacity.

The two-phase power supply, in turn, can have electrical voltages of 127 V or 220 V. In addition, the supply capacity of this type of generator ranges from 12,000 watts to 25,000 watts.

In the case of the three-phase generator, the voltage can also be 127 V or 220 V, but the capacity ranges from 25,000 watts to 75,000 watts.


If you want to avoid as much as possible the devices connected to the diesel generator can burn, you must ensure that the equipment has a good voltage regulator.

The regulator is responsible for making sure that the energy reaching the devices is constant, making the equipment more easily connected.

In this regard, the best is that the generator comes with the AVR (Automatic Voltage Regulator). It is he who will make the grid stable, similar to the power grid.

Tank and autonomy

Another criterion that we recommend that you take into account when buying the best diesel generator is the autonomy of the device. Autonomy is the period of time that the generator can run without needing to be refueled.

In general, diesel generators are designed to provide between 5 and 10 hours of power in a row.

But to make the right choice, it is necessary to consider that the autonomy depends on the size of the fuel tank. Therefore, you will find diesel generators with tanks whose capacity varies between 4 and 25 liters.


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