TruePower 2500QS - 110VAC/12VDC Designed specifically for the most rugged marine applications. Seamless conversion of DC battery power to filtered low noise AC household power. AC Switch automatically selects AC or DC power inputs (depending on which source is available), ensuring AC household power is available at all times. TruePower QS includes a digitally controlled, True 3-Stage battery charger that can automatically recharge, condition and maintain batteries. 2.8x Surge Rating with 1.0 Power Factor 7 Selectable 3-Stage Battery Charge Profiles Compact, Robust Design Easy-to-install, space saving design Fully Automatic Battery Charger and Inverter Instant AC transfer switch passes AC shore/station power. Charges battery when shore/station power is present, or switches safely into DC to AC inverter mode, making AC household power available on the water or on the road. Charger Mode: Integrated, Automatic True 3-Stage Marine Grade Battery Charger Built-in digital control technology provides seven user-selectable charge profiles for todays various battery chemistries. Inverter Mode: Efficient, Quiet Conversion from DC Power to AC Power Filtered Quasi (modified) Sine Wave AC output. Ideal for appliances, power tools and electronics. Inverter delivers 2.8 times surge capacity for demanding applications - air conditioners, microwaves, refrigerators and more. Pure sine wave passes through while connected to AC shore/station power. Built-in Safety: Designed and constructed to FCC Class A, Marine UL 1236, UL 458, and CE ABYC - A31 Marine Compliant.