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To run a 3HP (horsepower) 120V chainsaw, you would need an inverter that can handle the starting and running wattage. A 3HP motor typically requires around 2,200 to 3,000 watts for starting and about 2,000 watts for continuous operation. Therefore, you should look for an inverter with at least a 3,000-watt output capacity to ensure it can handle both the starting surge and the continuous load. Additionally, it's wise to choose an inverter with a bit of extra capacity for safety and efficiency.

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