A 120 V appliance drawing 10 A uses 1,200 W; run through an inverter on a 12 V battery that becomes about 110 A of DC current after ~90% inverter efficiency.
FAQ
How many amps is 1000 watts at 12 volts?
About 83 A before losses, or roughly 93 A from the battery through a 90%-efficient inverter.
How many watt-hours in a 100Ah battery?
12 V × 100 Ah = 1,200 Wh for lead-acid; 12.8 V × 100 Ah = 1,280 Wh for LiFePO4.