Off Grid Iinverters are principally meant to be used with solar, wind or hydro power systems for a home or business totally disconnected from the electric utility company. They can also be used for providing emergency backup power to homes that currently use the power from an electric company. Inverters with the built-in AC charger option are particularly well suited to providing seamless backup power.
Not sure what size battery to inverter cable or fuses/breakers to use with your inverter? Check out our handy table for quick inverter cables and breaker sizing as well as our Off-Grid Solar Electric System Calculator.
Also see: Hybrid Off Grid Inverters Capable of Grid Tie for inverters that are capable of working as both an off-grid or on-grid inverter. These inverters are often used primarily in on-grid mode and then in off-grid mode when there's a blackout (i.e. like a large UPS).