The Main Technical Properties of the Inverter

Rated output voltage

It indicates the rated voltage value that the inverter should be able to output within the allowed fluctuation range of the specified input DC voltage. The stability accuracy of the output rated voltage value is generally specified as follows. 


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In steady-state operation, the voltage fluctuation range should have a limit, for example, its deviation should not exceed ±3% or ±5% of the rated value.


In dynamic situations where the load changes suddenly or there are other disturbing factors, the output voltage deviation should not exceed ±8% or ±10% of the rated value.


Unbalance of output voltage

Most people know that a power inverter is used to convert DC power into AC power. However, few understand the concept of voltage unbalance. Voltage unbalance occurs when the three-phase voltage of the inverter output is not equal. This can lead to problems with the equipment or even cause a fire.


Under normal operating conditions, the three-phase voltage unbalance of the inverter output should not exceed a specified value, usually expressed in %, such as 5% or 8%. If the voltage unbalance exceeds this value, it is considered a fault. There are several causes of voltage unbalance, including:

- Loose or damaged AC power cables

- Wiring errors

- Faulty inverter


If you suspect that the voltage unbalance of your inverter output is exceeding the specified value, you should contact a qualified electrician or inverter technician immediately.


Waveform distortion of the output voltage


There are a lot of different types of power inverters on the market, and each one has its own specific output voltage waveform. When choosing a power inverter, it's important to make sure that the inverter's output voltage waveform is compatible with the load that it will be powering. Most inverters have a sinusoidal output voltage waveform, but some have a modified sine wave or square wave output. Each type of waveform has its own advantages and disadvantages, and it's important to choose the right one for your application.

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One thing to keep in mind when selecting a power inverter is the maximum waveform distortion that is allowed. When the inverter output voltage is sinusoidal, the maximum waveform distortion allowed should be specified, usually expressed as the total waveform distortion of the output voltage. The value should not exceed 5%. This is to ensure that the power inverter will not damage the load that it is powering.


So, when selecting a power inverter, make sure to check the output voltage waveform and the maximum waveform distortion to ensure that the inverter will be compatible with the load.


Rated output frequency

As we all know, the frequency of the inverter output AC voltage should be a relatively stable value, usually 50Hz. However, under normal operating conditions, the deviation should be within ±1%. So, what does this mean for us?


Basically, it means that the inverter is working as it should and is providing a stable voltage for our needs. However, if the deviation exceeds ±1%, then there may be some problems with the inverter. Therefore, we need to be aware of this and keep an eye on our inverters to make sure they are working properly.


Load Power Factor

An inverter is able to carry an inductive or capacitive load under certain conditions. When the load is an inductive load, the power factor is usually 0.7 to 0.9. If the load is capacitive, the power factor is usually 0.9. The capacity of an inverter is rated according to the maximum power that it can handle.


Rated output current

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Indicates the rated output current of the inverter in the specified load power factor range. Some inverter products give the rated output capacity, whose unit is expressed in VA or kVA. The rated capacity of the inverter is the product of rated output voltage and rated output current when the output power factor is 1.


Rated output efficiency

The efficiency of the inverter is the ratio of its output power to the input power under the specified working conditions, expressed in %. The efficiency of the inverter under the rated output capacity is the full-load efficiency, and the efficiency at 10% of the rated output capacity is the low-load efficiency.



An inverter is an electrical device that converts DC power to AC power. Inverters are used in a variety of applications, from small electronic devices to large industrial applications.


One of the most important aspects of an inverter is its overvoltage protection. Overvoltage protection prevents the inverter from being damaged by excessive voltage.


Most inverters have built-in overvoltage protection. However, for those inverters that don't have this protection, it's important to have other measures in place to protect the inverter from damage.

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One such measure is to have a voltage stabilization device in place. This device will help to regulate the voltage to a safe level, preventing the inverter from being damaged by excessive voltage.


Another measure that can be taken is to have an over-current protection device in place. This device will help to protect the inverter from damage caused by excessive current.


By taking these measures, you can help to protect your inverter from damage caused by overvoltage and over-current.


Starting characteristics

In any electrical system, the inverter plays a vital role in linking renewable energy sources with the load. The inverter must have the capability to start with the rated load and deliver the required power to the load, with good dynamic performance.


Renewable energy sources are highly volatile in nature, and the inverter must be able to deal with the fluctuations and provide steady power to the load. In addition, the inverter must be able to protect the load from voltage spikes and other surges.


The inverter must be designed for reliable starting under rated load, and must have good dynamic performance. The inverter should be able to deliver the required power to the load, with minimal distortion.



The transformer, filter inductor, electromagnetic switch and fan in power electronic equipment will generate noise. When the inverter is in normal operation, the noise should not exceed 80dB, and the noise of small inverter should not exceed 65dB.

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