The Xantrex Freedom SW 2000 (815-2012) is a 2000 watt, 12 volt pure sine wave inverter/charger with a 100 amp battery charger, built for RVs, boats, heavy duty and work trucks, and commercial and emergency vehicles. Generator Support Mode adds inverter power to a generator's output when your AC loads exceed what the generator can supply, and the built-in transfer switch moves loads to inverter power in under 20 milliseconds when shore or generator power drops out. Two units can be stacked in parallel to double inverter output or in series for 120/240 V split phase power.
Also available with built-in GFCI (815-2012-11).
See spec sheet for additional info