OutBack PS1 Grid Tie Battery Backup (Pictured with PS1-BE battery enclosure box, which is sold separately. Introducing the new PS1, a revolution in grid-tie solar with battery backup. Designed with an emphasis on performance, ease of installation, and low maintenance, we have eliminated all concerns about batteries in grid-tie systems.If you are considering adding a grid-tied solar system to your home or business, incorporating battery backup is common sense. The PS1 system performs better than some battery-less inverters. In side-by-side, real-world testing, the PS1 performed within 5% of the kilowatt hour performance achieved by the current industry-leading inverter.All fears about the complexity of grid-tie solar with battery backup are eliminated thanks to our "install ready" design. The PS1 system is a factory-wired solution with a complete ETL listing. The type 3R rainproof construction ensures that there is plenty of flexibility in where you choose to install the PS1.The PS1 system uses sealed AGM-type batteries, eliminating the need for periodic watering. OutBack's advanced charge control algorithm and smart battery management techniques allow for battery life to exceed 10 years in most grid-tie backup applications.The PS1-2500 uses a sealed inverter and is rated at 2500W continuous power; the PS1-3000 uses a vented inverter and is rated at 3000W. Specifications AC Input Voltage 120 VAC 60Hz Continuous Power Rating at 25� C 2500 Watts AC Maximum Surge Current Peak: 70 Amps AC RMS: 50 Amps AC PV Array Voltage Nominal: 48, 60 or 72 VDC Max: 140 VOC Maximum PV Array Wattage 3300 Watts STC Rating Listing ETL Approval to UL 1741 in Progress Battery Voltage 48 VDC Energy Storage 4.0 kWh at 80% Depth of Discharge Typical Inverter Efficiency 92% Typical System Efficiency 90% PS1 System Enclosure (HxWxD) 31.3"x17.25"x12.9" PS1 Battery Enclosure (HxWxD) 36.25"x17.25"x12.55" Total Shipping Weight (without batteries) 120 lbs. Enclosure Rating Outdoor Rainproof, Type 3R, Wall Mount