AIMS Power 1000 Watt Pure Sine Inverter with Selectable 25/55 Amp Charger & Automatic Transfer Switch 1000 watt continuous pure Sine power DC input/operating voltage: 10-16vdc AC input voltage range: 120 volts AC +/- 10% Battery low voltage alarm: 9.8 +/- 0.3 volts, low voltage shutdown: 9.5 +/- 0.5 volts Efficiency range: 86% - 90%