There are two main types, one is a sine wave inverter and the other is a square wave inverter.
The sine wave inverter outputs sine wave AC power that is as good as the grid we use everyday, because it does not have electromagnetic pollution in the grid.
The output of the square wave inverter is a square wave alternating current with poor quality, and its positive maximum to negative maximum value is generated almost at the same time, thus causing severe instability to the load and the inverter itself. At the same time, its load capacity is poor, only 40-60% of the rated load, and it cannot carry inductive loads. If the load is too large, the third harmonic component contained in the square-wave current will increase the capacitive current flowing into the load. In severe cases, the load filter capacitor will be damaged.
In view of the above shortcomings, a quasi-sine wave (or modified sine wave, modified sine wave, analog sine wave, etc.) inverter appears. The output waveform has a time interval from the maximum value in the positive direction to the negative value in the negative direction. The use effect has been improved, but the quasi-sinusoidal waveform is still composed of polylines. It belongs to the square wave category and has poor continuity.
In summary, sine wave inverters provide high quality AC power that can drive any kind of load, but are technically demanding and costly. Quasi-sine-wave inverters can meet most of our electricity demand, with high efficiency, low noise, and a reasonable price, making them the mainstream products in the market. The manufacture of the square wave inverter uses a simple multivibrator. Its technology belongs to the level of the 50s and will gradually exit the market.
Inverters can be divided into coal-fired inverters, solar inverters, wind energy inverters, and nuclear energy inverters according to different generation sources. According to different uses, it is divided into independent control inverters and grid-connected inverters.
Solar inverters in the world have high efficiency in Europe and the United States. The European standard is 97.2%, but the price is relatively expensive. The efficiency of other domestic inverters is below 90%, but the price is much lower than imports.
In addition to power and waveform, choosing the efficiency of the inverter is also very important. The higher the efficiency, the less energy is wasted on the inverter and the more energy is used in the electrical appliances, especially when you use a low-power system. The importance of one point is even more pronounced.