OutBack G-Series inverter/chargers are the grid-interactive versions in OutBack's FX inverter line. Available in either sealed (GTFX) or vented (GVFX) models, these inverters allow you to sell solar, wind, and/or hydro power back to the utility grid. If the utility power goes down, the inverter will automatically isolate themselves from the grid and use a battery bank and/or your renewable energy source(s) to power your critical loads. The inverter can be set up so that either utility power or your renewable sources (PV array, wind turbine, etc.) can be used after an outage to recharge the battery bank. AC power is seamlessly switched between utility and battery power through the inverter's built-in 60A transfer switch. With the OutBack grid-interactive system, backup AC power is made available 24 hours a day in the event of a utility outage, providing reliable power and peace of mind. At night, the inverter's automatic power save mode ensures that energy is not wasted by needlessly charging your batteries from the utility grid. With a healthy battery bank, daily energy rodction efficiency is very close to that of typical grid-intertie systems without backup. Up to two G-Series inverters can be "stacked" for 120/240V output. They come with a standard 5-year warranty with an optional 10-year extended warranty available where required by state incentive prorams and are Listed to UL 1741 for U.S. and Canada.