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How big of a generator do I need to run a 13500 BTU air conditioner?

You would need a starting wattage of 3000 watt for a 13,500 btu AC unit like the Dometic Brisk Air 2. The 3,200 watt generator is the best option. Up to 3,200 starting watt and 2,900 running watt can be put out by this.

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