VEVOR Sump Pump Battery Bundle, 2000W, Backup System with 100 Ah LiFePO4 Battery, Auto Switches to Inverter for Sump Pump, Pure Sine Wave, LCD Display, for Basement Protection Emergency Power Outage

This depends on the battery size. For example, a 100AH ​​battery would provide approximately 1280W * 12.8A / 120V = 0.97H, which is roughly one hour. A 200AH battery would provide double that.