Model No. FSAINV2000;Automatically switches over to battery power when AC power goes out. A Floodstop Deep Cycle AGM Battery (not included) is recommended;Generates a Pure Sine Wave 120 VAC voltage to reliably power your primary sump pump;Automatically recharges a battery when AC power is restored with a powerful built-in charger (10 Amp for 2000W system and 5 Amp for 1500W system);Output is enough to power two primary sump pumps simultaneously (combined current draw not exceeding 16.6 Amps for the 2000 Watt system and 12.5 Amps for the 1500 Watt system);Can be used as a power inverter for many applications requiring backup power