Soundproofing a diesel generator is a common concern during load shedding, especially when looking at practical ways to improve sound absorption and reduce noise. Where would your diesel generator score in the “Noisy Generator Olympics?” We’re guessing it would take a podium spot, and the reality is that generators are by no means quiet things when in operation. With ongoing load-shedding, backup power generators are in private homes, residential estates, office parks, and other places where emergency electrical supply is critical. The question many people ask is whether it is possible to achieve a quiet diesel generator. This article explains why generators are noisy and four ways you can try to soundproof your diesel generator:
Why Are Generators So Noisy
- Fuel type
How loud your generator is going to be during operation will depend largely on the type of fuel it uses. Solar power generators are practically silent, so these are commonly used indoors. Fossil fuel generators, like diesel gensets, are known to be the loudest. Diesel generators take the cake, followed by petroleum generators and then gas generators. - Engine size
The engine capacity of the generator set will also play a role in the noise levels. Understandably, the larger the engine, the louder the sound. This is true in cars as well, so you can expect industrial-size generators to be much louder than your garden-variety portable generator.
4 Ways To Soundproof A Diesel Generator
Bucket Of Water
Starting with the most rudimentary noise-cancelling solutions, here you’ll need a bucket of water and a suitable section of piping. Use this to divert your generator’s exhaust fumes into the full bucket of water (via the section of hose). The bucket of water acts as a muffler, but shouldn’t be left unattended, so use this one as a last resort.
Rubber Matting
If you’re looking for a quick noise-reduction solution that will dampen some sound while you find a permanent solution, try a thick rubber mat. When placed under your generator, this will reduce the prevalence of vibrations that add even more noise to the already-noisy engine.
Rubber Covers for Generator Noise Reduction
Speaking about rubber, a slightly more involved noise solution that could work for you is a rubber soundproof cover. Think of it as a rubber box without all of the panels that sits over the whole generator set. It still allows all exhaust fumes to be funneled out but contains most of the noise within the thick rubber covering.
LF125 Acoustic Panels
These professional sound-absorbing sections of foam can dampen over 70% of noise at 125 Hz. Used on the inside of your generator covering, LF125 panels will make a generator a lot quieter – and are specifically designed to never catch alight. This solution is only recommended for permanent generator quietening solutions, as it will come in on the more expensive end of the spectrum.
Common Generator Soundproofing Mistakes to Avoid
Basic noise-reduction methods can help lower generator sound levels, but they are not always enough, especially in residential areas, office parks, hospitals, schools, or other noise-sensitive environments. Poorly planned soundproofing can also create serious safety and performance problems.
Common generator soundproofing mistakes include:
- Installing soundproofing without allowing proper airflow can lead to overheating
- Using enclosure designs that restrict maintenance access or trap excessive heat
- Failing to manage exhaust noise and fumes safely
- Choosing materials that are not suitable for high temperatures or outdoor conditions
- Relying on temporary DIY solutions that reduce performance or shorten the generator’s lifespan
- Underestimating noise-control requirements in residential or commercial areas with strict sound regulations
Why Choose S&A Generators
S&A Generators has over 50 years of experience working with diesel generators across residential, commercial, and industrial environments. Our team understands how different generator setups can be in real-world conditions and how to reduce noise without affecting performance.
Frequently Asked Questions
How Loud is a Typical Diesel Generator?
Diesel generators typically produce between 85 and 110 decibels, depending on their size and load. This is similar to heavy traffic or construction noise, which can be disruptive in residential or office environments.
Can You Run a Generator in a Soundproof Box Safely?
Yes, but only if the enclosure is designed with proper ventilation and heat control. Without this, the generator can overheat or allow exhaust fumes to build up, which creates safety risks.
What is The Cheapest Way To Reduce Generator Noise?
Simple methods like placing the generator on rubber matting or repositioning it further away can support diesel generator noise reduction at a low cost. These options help limit vibration and direct sound away from nearby spaces.
Does Distance Reduce Generator Noise?
Yes, increasing the distance between the generator and surrounding areas is a simple way to soundproof a diesel generator by reducing how loud it sounds. Even a small change in placement can make a noticeable difference in noise levels.
Diesel Generator Repairs And Maintenance in KwaZulu-Natal
Whether you have a generator that goes CLANK too often for your liking, or you’re looking to install a new generator but you have noise concerns, we’re able to assist. S&A Generators has been specialising in generator installations, relocations, repairs, and planned maintenance for over 50 years. Contact us, and we’ll find the perfect soundproofing solution for your unique challenges.