Kohler 20RESCL-200SELS Air-Cooled Standby Generator with 200 Amp Transfer Switch Single Phase, 20,000-Watt 20,000-watt air-cooled generator automatically starts up when the power goes out Includes 200 Amp whole-house, service entrance rated, load shedding, automatic transfer switch Fast response--power to your home in 10 seconds; premium power quality; quiet operation 100% corrosion-proof enclosure offers protection from even the harshest seaside conditions Measures 48 by 26.2 by 29 inches; 5-year/2000-hour limited warranty Battery type needed - Group 51