Reliable Pure Sine Wave Inverter Selection
Learn how to choose, install, and use pure sine wave inverters to protect your electronics and keep everything running during blackouts and off-grid adventures.
A Pure Sine Wave Inverter is a must-have for any serious off-grid or backup power system. Unlike modified or square wave inverters, it delivers a clean, sinusoidal AC output identical to the grid, making it ideal for sensitive electronics, medical equipment, and precision appliances. In this guide, we'll walk you through:
Modified sine wave inverters use simpler and cheaper electronics to produce a wave that is not quite a smooth sine wave. Pure sine wave inverters use more expensive electronics to generate a wave that is very close to a pure sine wave. The figure below compares outputs from a modified sine waver inverter and a pure sine wave inverter.
Sine wave inverters work in three stages: the oscillator stage, the booster or amplifier stage, and finally the transformer stage. The oscillator stage does what the title says it does: changes the DC current to an oscillating AC current. The oscillating current can be set to a particular frequency: for the United States the frequency is 60 Hz.
Unlike modified sine wave inverters that can interfere with certain devices, pure sine wave inverters work properly with all types of equipment. This general compatibility includes sensitive medical equipment like CPAP machines, precision tools, variable speed motors, laser printers, and newer appliances with digital controls.
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