Running time = Battery capacity × DoD × η ÷ Device rated power
DoD refers to Depth of Discharge and η is local inverter efficiency. For AC200L, DoD and η are 95% and 93%. If you run a 1,000W microwave oven with it, the running time will be:
2,048Wh × 95% × 93% ÷ 1,000W ≈ 1.81hrs
Note:
1) The formula is NOT suitable for inductive loads with compressors, like refrigerator, air conditioner, etc.
2) The above data is for reference ONLY.