How to choose efficient and silent inverter stabilizer for residential areas

When selecting equipment to be installed in residential areas, the noise level generated by voltage stabilizers during operation is a parameter that must be considered. Otherwise, the noise produced by the equipment during operation is likely to cause discomfort to users. Next, we will discuss the noise issues of voltage stabilizers during operation, including the causes of noise, the types of equipment that generate more noticeable noise, and which stabilizer models are considered quiet.

Main Causes of Noise from Voltage Stabilizers
 

Almost all voltage stabilizers produce some level of noise during operation, with some being quieter than others. The nature and volume of the noise depend on the type of equipment and its operating characteristics.

• Autotransformers: which are voltage stabilizers that utilize autotransformers such as ferroresonant, electromechanical, relay, thyristor, and triac models, emit a distinct buzzing sound during operation. This sound comes from the transformer itself, and its volume is related to the deviation between the input voltage value and the nominal value, as well as the load level.
• Movable collector contacts: Electromechanical stabilizers contain collector contacts (rollers) driven by a special servo drive. The combination of these two mechanisms produces a relatively loud buzzing sound when triggered, so such stabilizers are considered the noisiest.
   
• Switching processes: Many voltage stabilizers generate noise during operation due to internal switching processes. Among them, relay devices emit a specific clicking sound, which is caused by the operation of the power electronic relay unit when correcting the input voltage. If the power grid is relatively stable and the voltage does not fluctuate frequently, the clicking sound of the stabilizer will not be noticeable. Otherwise, if triggered often, the sound from the relay stabilizer can be very annoying. Thyristors and triacs have a similar operating principle but are based on semiconductor electronic bonds rather than relays, which can significantly reduce their operating noise.
   
• Cooling systems: Low- and medium-power voltage stabilizers mainly employ silent convection (or natural convection, also known as fanless) cooling systems. High-output single-phase and three-phase products utilize fan-based cooling systems because, under high loads, heat must be dissipated from the components of the power section. At high speeds, such fans can generate noise exceeding 60 decibels; however, this type of equipment is not commonly used in homes.

SNOWINER Silent Inverter Stabilizers
 

The HIS” series of silent and low-noise inverter voltage stabilizers is manufactured by Wenzhou Xunwen Electric Co., Ltd., a Chinese company specializing in power supply systems. These devices do not have autotransformers or any moving parts. Instead, they use static converters, which consist of an inverter and a rectifier, that do not produce any noise during operation. Therefore, the noise of inverter voltage stabilizers with a convection cooling system will not exceed the normal household background noise and can be safely installed in residential areas.
 

The medium-power "Shtil" inverter stabilizer is equipped with a fan, but its cooling system operates in a combined manner. In normal mode, the equipment is cooled by convection (due to natural air circulation), and the fan is turned on in stages only when the temperature of the internal radiator reaches a critical level.
 

Note: Inverter voltage stabilizers adopt a unique voltage correction principle - dual stepless conversion: first, the grid voltage is converted to direct current, and then to alternating current. Compared with other types of voltage stabilizers, this working algorithm significantly expands the technical capabilities of inverter equipment.
 

Specifically, HIS stabilizers have the following characteristics:
 

• Immediate response to line voltage fluctuations (neutralization within 0 milliseconds);
• Stabilization of input voltage in an extended range (from 90 to 310 V);
• Continuous supply of voltage with the highest precision (±2%) and an ideal sine wave to the connected load (over the entire range of maximum deviations of the power supply network);
• Provision of uninterrupted power supply to connected equipment during short-term power outages (up to 200 milliseconds).
• Silent Stabilizer "HIS" Models
   

Among inverter voltage stabilizers, wall-mounted models with an output power of 0.35 to 1 kVA are absolutely quiet:
 

• IS350 (350 VA / 300 W);
• IS550 (550 VA / 400 W);
• IS800 (800 VA / 600 W);
• IS1000 (1000 VA / 800 W).
   

These models adopt convection cooling (without fans). A dedicated radiator is installed inside the chassis. During operation, the heated air inside rises and is discharged from the chassis. This design eliminates the need for a fan and also reduces the weight of the product.
 

Summarize

When purchasing a voltage stabilizer suitable for residential areas, noise is one of the key factors to consider. Traditional voltage stabilizers often generate loud noise due to the operation of transformers, relays, or fans, while inverter stabilizers use electronic conversion technology without mechanical parts, and Xunwen fundamentally solves this problem. Silent inverter stabilizers represented by the SNOWINER HIS series not only achieve nearly silent operation (noise is lower than the ambient background sound), but also have the advantages of fast response, wide voltage range, and precise voltage regulation.