TRIPP LITE's MRV2012UL MRV2012UL inverter/charger is a heavy-duty, DC to AC inverter with automatic line to battery transfer and integrated charging system that serves as an extended-run UPS, a standalone power source or an automotive inverter suitable for rugged RV applications. It provides equipment with utility or generator-supplied AC electricity filtered through premium ISOBAR surge protection. It's the ideal, quiet alternative to gas generators with no fumes, fuel or noise to deal with! The MRV2012UL inverter/charger supplies up to 2000 W of continuous 120 V AC power from any 12 V DC battery or automotive DC source. It passes sine wave utility or generator power during battery charging and UPS line power operation, plus an efficient PWM sine wave AC output in inverter and UPS backup modes. When the hardwire AC input is energized, commercial power passes through to connected equipment and the battery bank is recharged via 3 stage charging system with user-selectable 25/100 A charger output. In the UPS mode, it responds to blackouts and voltage fluctuations with a near-instantaneous automatic transfer to battery-derived AC output. It includes a set of high-current DC input terminal posts for simple installation of user supplies batteries and cabling. See owner's manual for recommendations. The MRV2012UL inverter/charger is highly adaptable to a variety of applications and site conditions with adjustable charger settings for wet/gel battery types and selectable line to battery power transfer voltages. It supports an unlimited amount of runtime with any number of user-supplied batteries connected. NOTE: To protect against high current draw that may occur during inverter failure, a fuse link rated at 400 A should be positioned no more than 18 in from the MRV2012UL's battery in the positive line.