a 15k a/c will typically draw around 13 amps, and may draw up to 18, so at 18 x 110 volts your at 1980 watts, give or take a little. Most all Gen's are rated at 80% capacity which is 1920 watts out of 2400. So, will it run it, yes, is it hard on it, yes. Your better off with a 3k gen IMHO
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