A motor's exact amperage draw rating isn't always easy to find, but should be available from the manufacturer or, if it's a motor we stock, from a representative. A motor's amperage draw rating refers to how much amperage (or current) a motor draws at a given speed. Motor Amperage Draw : The second factor we need to compute estimated run time is motor amperage draw. Alternatively, the same battery could also supply 10 amps of power for 10 hours (10 amps * 10 hours = 100 amp hours) before running dry You can think of the amperage hour rating as being similar to a gas tank in a car – the larger it is, the more energy/fuel it can store, and the longer it can power a motor. ![]() For example, a 100 amperage hour battery is one that would be able to supply 25 amps of power for 4 hours (25 amps * 4 hours = 100 amp hours) before running out of energy. The larger the rating, the more power the battery can hold, and the longer it will be able to power a motor at a given speed. ![]() Keep in mind that trolling motor run-time is not an exact science but the following parameters will help you approximate your potential run time.Īmperage Hour Rating : Marine batteries are rated on a metric called “amperage hours”, which is an indication of how long a battery can supply a consistent amperage. A common question people have when trying to select a motor is “How long will this motor run out on the water?” To answer this question, it's necessary to know two things: a battery's amperage hour rating and a motor's amperage draw.
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