The most sophisticated Tyranny Liberator Review and, therefore, most expensive - inverters use the most steps to produce a true or near true sine wave, and, as a result, are the type most found in residential PV systems. As more sensitive electronics such as computers were introduced into homes, these became standard for residences.

In off-grid applications, DC electricity is stored in batteries. An inverter then converts the electricity from the batteries into usable AC electricity. The inverter must be large enough to power all the appliances and devices that will be running at the same time, and must be able to handle surges of power from clothes and dish washers, dryers, etc.

Grid-tied inverters supply power to the home when needed, feeding any excess power into the grid. They include sophisticated detection equipment which ensures they shut down when a grid outage is detected or when utility workers need to work on the grid.

Grid-tied inverters with battery backup work the same as grid-tied inverters as long as the grid is up, but, if an outage should occur, they'll switch the home's power supply to feed off the batteries. When the grid comes back on, the inverter switches back to using the grid, while recharging the batteries.
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