Power inverters convert low voltage direct current (DC) power from a car outlet or battery to the alternating current (AC) power required by most power tools and home appliances. Inverters are classified as pure sine wave or modified sine wave.
Sine Wave
The power supplied to homes is relatively close to an ideal sine wave. Pure sine wave inverters are designed to emulate this power and, in some cases, provide an even better waveform than the utility company.
Modified Sine Wave
Other inverters that use less elaborate switching and filtering circuitry are classified as modified sine wave inverters. The frequency and voltage of their outputs may vary and contain some noise and distortion.
Use With Precision Equipment
Some equipment requires accurate voltages and a clean waveform. Laser printers, variable speed motors and digital clocks are examples. Motors also may start and run more efficiently on a pure sine wave.
Less Demanding Usage
Other devices can accept distortion in their input power, and a modified sine wave inverter will work just fine for them.
Price
Depending on its power rating, the cost of a modified sine inverter will range from $20 to more than $600. Pure sine devices are priced from $200 to more than $800.
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