How to choose the quietest generator set

That is why more and more companies are looking for a silent generator set capable of combining reliability, power and operation with the lowest possible noise impact.

But what characteristics should a truly quiet unit have? What is the difference between a silent generator set and a soundproof generator set? Which technical aspects influence the final acoustic level?

In this article, we review the main factors to consider before choosing a generator set designed to operate with low noise emissions.

A silent generator set is a unit specifically designed to minimise the noise generated during operation. To achieve this, it incorporates different acoustic insulation and anti-vibration solutions that reduce both engine noise and structural vibrations.

We develop energy solutions tailored to each installation, including soundproof configurations

These types of units are particularly useful in installations where noise may affect daily operations, the surrounding environment or even compliance with acoustic regulations.

Although the terms are often used interchangeably, there is a slight difference between the following concepts:

• Silent generator set: refers to the unit’s overall low noise level.
• Soundproof generator set: focuses on the technical acoustic insulation solutions incorporated into the generator.

In practice, both concepts are closely related and pursue the same objective: delivering reliable power with the lowest possible acoustic impact.

The noise level of a generator set can become a decisive factor depending on its location and application.

Installing a generator in a quarry or an isolated industrial plant is very different from installing it in:

• hospitals,
• residential buildings,
• data centres,
• hotels,
• urban infrastructures,
• educational facilities,
• events or public spaces.

In these cases, reducing noise not only improves environmental comfort, but also helps comply with local regulations and project-specific requirements.

In addition, proper acoustic design is usually accompanied by optimised engineering and better integration of the equipment within the installation.

1. Noise level in dB(A)

The first aspect to analyse is the noise level expressed in decibels dB(A).

This value is usually measured at a specific distance — commonly 1, 7 or 10 metres — and allows the acoustic performance of different units to be compared.

As a general reference:

• A standard generator set can easily exceed 90 dB(A).
• A soundproof generator set can operate below 70–75 dB(A), depending on power rating and configuration.

It is important to always review:

• the measurement distance,
• the test conditions,
• and the load at which the test was carried out.

Two units with apparently similar figures may behave very differently under real operating conditions.

The UNE-EN ISO 8528-10 standard establishes an assessment at 1 metre distance, in an open environment and operating at 75% load, thus providing a benchmark and facilitating comparisons between different units.

2. Quality of the soundproof enclosure

The acoustic enclosure is one of the most important elements in a silent generator set.

A well-designed enclosure should incorporate:

• high-density sound-absorbing materials,
• thermal and acoustic insulation,
• optimised air inlet and outlet systems,
• anti-vibration systems,
• high-performance exhaust silencers.

Furthermore, structural design directly influences acoustic performance. It is not simply about “enclosing” the generator, but about ensuring correct ventilation and heat dissipation without increasing noise levels.

More and more companies are looking for a silent generator set capable of combining reliability, power and operation with the lowest possible noise impact.

In critical applications, it is also common to incorporate:

• anti-corrosion treatments,
• reinforced ventilation systems,
• and configurations adapted to demanding environmental conditions.

3. Type of installation and environment

The environment in which the unit will be installed completely determines the selection.

For example:

Urban environments

Require very low acoustic levels and more carefully integrated aesthetics.

Hospitals and healthcare facilities

The priority is to maintain energy continuity without interfering with medical activity or causing discomfort, ensuring that both operation and periodic testing do not disturb building occupants.

Data centres

In addition to noise, operational stability, rapid response and integration with control and monitoring systems are particularly valued.

Events and temporary applications

Compact, quiet and easy-to-transport solutions are required.

The noise level of a generator set can become a decisive factor depending on its location and application.

Therefore, before selecting a unit, it is essential to analyse:

• the location,
• acoustic restrictions,
• operating schedules,
• and proximity to people or sensitive buildings.

4. Appropriate power rating for the application

Oversizing or undersizing a generator can affect both performance and noise levels.

A unit constantly operating under unsuitable loads may generate:

• higher fuel consumption,
• increased vibrations,
• poorer acoustic behaviour,
• and premature wear.

For this reason, power selection should take into account:

• the actual load,
• starting peaks,
• the type of application,
• and future installation growth.

In complex projects, working with a specialised manufacturer makes it possible to develop solutions tailored to each specific requirement, drawing on experience to prevent potential unforeseen issues.

5. Engine, alternator and internal components

Noise levels do not depend solely on the enclosure. Components such as the following also have a significant influence:

• engine,
• alternator,
• ventilation,
• base frame,
• or exhaust system.

Specialised manufacturers work with optimised configurations designed to reduce vibrations and improve the overall efficiency of the system, using proven and validated solutions while adapting them to the specific characteristics of each installation.

In addition, significant acoustic performance improvements can be achieved through technologies such as:

• anti-vibration mounts,
• low-noise fans,
• industrial silencers,
• or advanced electronic controls.

Choosing a soundproof generator set offers multiple benefits:

• Reduced acoustic impact.
• Greater comfort for workers and users.
• Compliance with noise regulations.
• Better integration into urban environments.
• Reduced vibrations.
• Higher perception of quality and reliability.
• More stable operation in sensitive applications.

Furthermore, in many current projects, silence is no longer an added value, but an essential technical requirement.

Not all projects require the same level of soundproofing.

That is why, beyond simply comparing dB(A) figures, it is important to assess:

• the type of application,
• the environment,
• operational requirements,
• and the unit’s real operating behaviour.

At Genesal Energy, we develop energy solutions tailored to each installation, including soundproof configurations designed to operate in environments where reliability and acoustic control are essential.