Modified Sine Wave Inverter Considerations
Modified sine wave inverters should avoid "inductive loads". In layman's terms, high-power electrical products made by applying the principle of electromagnetic induction, such as motors, compressors, relays, fluorescent lamps, etc. Such products require a much larger starting current (about 5-7 times) than the current required to maintain normal operation when starting. For example, a refrigerator that consumes about 150 watts of electricity during normal operation can start up to more than 1,000 watts. In addition, since the inductive load will generate a back electromotive force voltage at the moment when the power supply is turned on or off, the peak value of this voltage is much larger than the voltage value that the vehicle inverter can withstand, which is easy to cause the vehicle inverter. The instantaneous overload will affect the service life of the inverter.
When using an ordinary multimeter to measure the AC output of the quasi-sine wave (corrected sine wave) vehicle inverter, the displayed voltage is about 20V lower than 220V.
Problems can arise when operating precision equipment, and it can also cause high-frequency interference to communication equipment.