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What Inductive loads will do to your Inverter?
2020-12-20

Inductive Loads:

The inductive load is the part of a circuit that uses magnetic energy to produce work. To be precise, it is characterized by that the load current lags behind the load voltage with a phase difference for inductive loads, such as transformers and motors. The another is a circuit that also consumes reactive power when it is consuming active power which also has a coil inside. Both these two loads are named as an "Inductive Load".


Since the inductive load generates a back-EMF voltage at the moment when the power is turned on or off, the peak voltage is much greater than the voltage that the load AC power supply can withstand, which can easily cause the inverter in vehicle overload to shorten inverter life. Therefore this type of electrical appliance has a higher demand for power supply waveforms at its boosting stage. 


To Modified Sine Wave Power Inverter;

Modified sine wave is an optimized solution based on square wave inverter, which is capable of  operating with the inductive loads without the buzz or failure but it still has the disadvantage of the output voltage phase switch (magnetic pole switch) change which can cause the motor to be damaged with extended time use. Motor bearings can be damaged by this rapid magnetic pole switching.  
 
Modified sine wave power inverters are capable of running the inductive loads, but NEVER use modified sine wave inverter as the one power source for your motored loads, like the coffee machine, fan, pump or refrigerator.  
 
Please keep in mind that using a cheap inverter may not give the cheap outcome.

modified sine waveform

To Pure Sine Wave Power Inverter;

Pure sine wave is the best way to run the inductive loads in your RV. Thanks to its pure sine waveform, the  magnetic pole switch is gentle and gradually varied, it will cause no  damage to the motor rotor, brush and bearings.  

pure sine waveform


For instance, many inductive appliances like refrigerators, air conditioners, and water pumps need high surge power for a few seconds (from 3 to 5 seconds) at start up, so it is critical for a power inverter to be rugged enough to handle the rush.  
 
Generally high frequency power inverters should handle surge power of 2*rated power, low frequency inverters should  handle surge power of 3*rated power. When you get a water pump rated power, for example 650W. You need the high frequency inverter power at least of: 650*2.5=1625W, low frequency inverter power at least: 650*2=1300W; 

 

power inverter diagram


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