"Backup Power Source provides this battery backup system that keeps you in control of your power needs. This system provides clean, instant and reliable backup power to protect your home or business from power outages. Provides 4400 running Watts 8800 surge Watts of 120 or 240V pure sine wave power. Integrated inverter is prewired to internal AC/DC distribution center. Secures critical loads security system, refrigeration, sump pump, heating system, lights and more for up to 48 hours. U.S.A. Requires a licensed electrician for wiring and installation. Battery Enclosure UL rated steel with matte finish, Run Time hrs. 24-48 contingent on load, Electrician Required Yes, Works With Gas Generator Yes, Battery Type 105Ah AGM, Hardwired Yes, Rechargeable Battery Bank Yes, Running Watts 4,400, Surge Watts 8,500, Alternative Power Collection Yes Compatible with grid power, external generators and/or renewable energy sources, Amps 60, Standby Unit Yes, Dimensions L x W x H in. 16D x 34W x 55H, Power Volts 120/240V AC, Solar Power Compatible Yes, Batteries qty. 8, Allows Backfeeding of Power No, Automatic Switch Back Yes, Inverter Sine Wave Pure Sine Wave. Monitors utility power seamlessly and automatically transfers electricity to power management system When utility power is restored, automatically transfers back and recharges battery system Works with alternative energy sources solar, wind and hydroelectric and/or a generator Can be used for off-grid applications Modular design allows for expansion Includes eight 12V, 105Ah maintenance-free batteries Requires a licensed electrician for wiring and installation Includes lockable UL listed enclosure"