The number of batteries required for a 3000W inverter depends on the power of your inverter and the length of time it runs. The ampere per hour (AH), rated voltage (V), and effective working capacity of your purchased battery will also affect the number of batteries you need.
A 1000W inverter can drive many commonly used electronic and office equipment, kitchen appliances, portable power tools, and household items. When selecting equipment, ensure the total power does not exceed the rated power of the inverter to ensure the regular operation of the equipment and the safe use of the inverter.