Once the most common type of inverters, modified sine wave inverters are generally considered obsolete by today's standards. At one time, pure sine wave inverters were significantly more expensive. Today's pure sine wave inverters have come down in cost dramatically, making it a simpler choice.
• Main disadvantage is peak voltage varies with battery voltage. Inexpensive electronic devices with no regulation of power supply may behave erratically when battery voltage fluctuates.
• Not all modified sine wave inverters are created equal. A high quality modified sine wave inverter will run most loads without a problem.
• Low-cost, lightweight modified sine wave inverters generally produce very dirty power and not recommended for any important or sensitive loads.