The inverter itself also consumes part of the electricity when it is working, so its input power is greater than its output power. The efficiency of the inverter is 

the ratio of the input power to the output power of the inverter. If an inverter inputs 100W of direct current and outputs 90W of alternating current, then its 

efficiency is 90%.

In layman's terms, it is the high-power electrical products made by the principle of electromagnetic induction, such as motors, compressors, relays, fluorescent 

lamps and so on. This type of product requires a start current much larger (about 3-7 times) than the current required to maintain normal operation during 

start-up. For example, a refrigerator that consumes about 150 watts of electricity during normal operation can have a starting power of more than 1,000 watts. 

In addition, because the inductive load generates a back-EMF voltage at the moment the power is turned on or off, the peak value of this voltage is much 

greater than the voltage that the inverter can withstand, which can easily cause instantaneous overload of the inverter , Affect the service life of the inverter. 

Therefore, such electrical appliances have higher requirements for power supply waveforms.

There are two main categories, one is sine wave inverter, and the other is square wave inverter. The output of the sine wave inverter is the same or better sine 

wave AC power as the grid we use daily, because it does not have electromagnetic pollution in the grid. The output of the square wave inverter is poor quality 

square wave alternating current, and its maximum value in the positive direction to the maximum value in the negative direction are generated almost at the 

same time, which will cause severe and unstable effects on 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 load. 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, and in severe cases, it will damage the power filter capacitor of the load.

An inverter is an electronic device that converts low-voltage direct current into alternating current, because we usually rectify 220V alternating current into direct 

current for use, and the inverter has the opposite effect. We are in a "mobile" era, mobile office, mobile communication, mobile leisure and entertainment. In a 

mobile state, people not only need low-voltage DC power supplied by batteries or batteries, but also require 220V AC power that is indispensable in our daily 

environment. Inverters can meet our needs.