Silent Type Generator
Sound-attenuated diesel generator sets, from the 7.5 kVA class to 1000 kVA and above, specified against the noise level required at the listening point.
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Noise is a specification, and it has to be written as a number
Almost every buyer who asks for a silent set is really asking for a level at a particular distance: the boundary fence of a hotel, the deck of a vessel, the wall of a clinic, the edge of a residential plot. A set described only as "silent" tells nobody whether it will satisfy that requirement. The honest way to specify it is to state the acceptable level, the distance, and the ambient noise around it, and then match the enclosure to those figures.
These sets are built with sound-attenuated canopies, and the enclosure is selected against the level you need rather than against the description on a brochure.
- Build formSound-attenuated canopy on a steel base frame
- Usual output windowFrom the 7.5 kVA class to 1000 kVA and above
- Frequency and speed50 Hz at 1500 rpm; 60 Hz at 1800 rpm confirmed per order
- Output400/230 V three-phase, with single-phase circuits from the same set
- OperationManual start, or automatic start with ATS interface for unattended sites
Specification sheet for a sound-attenuated set
| Item | Configuration |
|---|---|
| Genset type | Diesel generator set in a sound-attenuated canopy |
| Engine and alternator | Engine platform selected per order; brushless, single-bearing alternator matched to the rating |
| Output window | From small sets in the 7.5 kVA class through to 1000 kVA and above |
| Frequency and rated speed | 50 Hz at 1500 rpm; 60 Hz at 1800 rpm on request |
| Voltage and phase | 400/230 V, 3-phase, 4-wire; 440 V to order |
| Power factor | 0.8 lagging |
| Enclosure | Painted steel canopy with absorbent lining, lockable doors and lifting points |
| Air path | Intake and discharge sections arranged around the radiator and the site ambient |
| Panel | Control and metering panel positioned so readings are visible with the doors closed |
| Control functions | Manual start, or automatic start with ATS interface and dry contacts |
| Fuel tank | Base-frame integral tank inside the canopy; capacity set by the running hours required |
| Sound level | Commonly specified between 65 and 75 dB(A) at 7 m depending on the build; confirmed against the level you require |
| Dimensions and weight | Confirmed per model and canopy on the quotation |
| Packing | Strong wooden case with waterproof cloth |
| Typical duty | Hotels and clinics, residential and urban boundaries, mobile and marine installations, commercial standby |
What decides whether a silent set meets the requirement
- The level is stated as a number at a distance. A requirement such as 70 dB(A) at 7 m can be checked and matched; the word "silent" cannot.
- The surrounding noise matters as much as the set. A set at a busy road boundary can be louder in absolute terms and still be inaudible underneath the traffic, while the same machine beside a quiet clinic is not.
- Where the set is placed changes the answer. A machine on a rooftop radiates differently from one at ground level against a wall, so the installation position is part of the specification.
- Attenuation is a combination, not a single part. Lining, door sealing and the exhaust arrangement work together, and the exhaust is often the dominant path on a small set.
- Cooling and quietening pull against each other. A restriction added for noise has to be balanced with the air the radiator needs, which is why both are specified at once.
- Small sets are not automatically quiet sets. A machine in the 7.5 kVA class running close to a window still needs a properly built canopy, not a thin cover.
Who manufactures these sets
Jiangsu Qingzhiteng Power Equipment Co., Ltd produces diesel and gas generator sets in Yangzhou, Jiangsu, including low-noise canopy units, container types, sets with ATS, parallel systems and remote-monitoring configurations. The inland diesel programme covers 3 kVA to 3000 kVA and the marine programme 12 kW to 500 kW, with exports to more than 80 countries across five continents.
How a sound-attenuated set is built and tested
- The required level, the distance and the installation position are confirmed.
- The canopy build is fixed against the set's cooling requirement and that level.
- Engine and alternator are received and checked against the order.
- The set is coupled on its base frame and the circuits are assembled and tested.
- The machine is run on the test bench and its settings are verified.
- The lined canopy is fitted, the air path is checked and the finish is completed.
- The unit is cased with waterproof cloth and shipped with its documentation.
Duties of the same kind
Hotel and clinic standby, Southeast Asia
The plant room shared a wall with guest rooms, so the enclosure and the exhaust arrangement were specified against a level agreed with the operator.
Mobile unit, Middle East
A set was needed near temporary accommodation. The canopy was chosen for the distance to the nearest unit rather than for the smallest available build.
Residential boundary, Africa
A small set serving a compound sat close to a neighbouring plot, so attenuation and the exhaust route were treated as the deciding issues.
Questions buyers ask about silent sets
How do I specify a sound level that can actually be met?
Give us the acceptable level, the distance to the listening point and the ambient noise there, plus the installation position. Those four items are what the canopy and exhaust arrangement are matched against.
Figures for this kind of set are usually quoted at 7 m, which is a more meaningful buyer-side distance than 1 m. When comparing offers, check which distance each supplier used, because the same machine gives very different readings at the two positions.
Can a silent set still be automatic?
Yes. An automatic start panel with an ATS interface is specified with the canopy for unattended sites, and the panel is positioned so it can be read with the doors closed.
Does the enclosure restrict cooling?
The air path is arranged around the radiator and the site ambient so the build does not cost the set its rating. Tell us the maximum ambient temperature at the site and the cooling arrangement will be set against it.
What are the MOQ, lead time and payment terms?
These depend on the rating, the canopy specification, the quantity, the destination and the payment method and are stated in the quotation. Send the level you need and the port and we will quote against it.
Canopies supplied separately for existing machines are described on the genset canopy page, while the container type sets cover larger enclosed installations. The full product range lists the remaining build forms.
Send the level you need, at the distance that matters
Tell us the required output, the acceptable sound level and the distance it applies at, the ambient noise around the site, whether the position is rooftop or ground level, the voltage and frequency, whether automatic start is needed, the quantity and the destination port. That is what the enclosure is specified from.
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