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Total the watt ratings of all the AC-powered components on your boat. A boat's total current draw is expressed in kilowatts (kW), a term that means one thousand watts of electricity. As a rule of thumb, select a genset rated from 10 to 25 percent greater than the boat's average draw. In other words, if your totals add up to a load of 1,500 watts, then 2kW worth of genset is just about right. Extra capacity allows you room for future appliances, yet doesn't leave the engine loafing