ProMariner 01512 True Power 1500QS Inverter/Charger - 1,500 Watt Modified Sine Wave Inverter with 12 Volt, 40 Amp Battery Charger Fully Automatic Battery Charger and Inverter Filtered Quasi (modified) Sine Wave AC output. 7 Selectable 3-Stage Battery Charge Profiles 2.8x Surge Rating with 1.0 Power Factor Instant AC transfer switch