The phase current I in amps (A) is equal to the power P in watts (W), divided by the power factor PF times the RMS voltage V in volts (V): I (A) = P (W) / (PF × V (V)) To learn more, see our tips on writing great answers. This continuous watt rating is different from a peak watt rating that describes how much energy the motor can manage (or, again consume) for short periods of time. A 250-watt motor, if you're doing full throttle, is going to be able to get you to a top speed of, let's say, 15 miles an hour. How much power it actually produces / consumes is based the connected load. If you plan on climbing hills, that weight becomes a direct load proportional to the slope. Read the amperage information from the label imprinted on the motor housing. What does the 'watt' specified for a motor mean? If you're looking at a 500-watt motor, that's gonna be able to get you to a top speed of about 20 miles an hour. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. So just about all e-bike manufacturers stay under 48v 750 watt, anything more the government considers a motorcycle and requires license and registration. Can electric bike controllers be used with a brushed DC motor taken from an electric lawnmower? Use MathJax to format equations. After the steps above the final formula for converting horsepower to amps is: Amps = HP × 746 V × η × PF To finish that thought though, the rating is the MAXIMUM power capacity of that motor. In the U.S., the reading is likely to be between 110 and 120 volts (See Reference 5). Electric circuits can handle only a limited amount of watts, so it is vitally important to know the wattage of devices such as electric motors before plugging one into a wall socket or installing one within a piece of equipment. A motor with high wattage will be able to consume a lot of energy in a short amount of time. That would suggest that a motor with "1500 watts" marked on it should be capable of delivering 1500 watts of mechanical power to a load. You receive a one-stop drive system solution that meets all the demands required of drive technology. The current I in amps (A) is equal to the power P in watts (W), divided by the voltage V in volts (V): I (A) = P (W) / V (V) AC single phase watts to amps calculation. And if I wanted to drive two wheels of a car (x kg car) what are the factors that I will need to keep in mind while selecting the motor? In SI base units, the watt is described as kg⋅m ⋅s . A “watt” is How do I determine what motor watt to buy? In general, in the United States, the maximum road legal e-bike is a 750 watt motor and a top speed of 20 miles per hour. rev 2021.1.5.38258, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. There is a variety of methods for accurately measuring a motor's wattage, but the simplest techniques happen to work the best. Can you hide "bleeded area" in Print PDF? Surge Watts are important if you plan to run anything with an electric motor. If you plan on only running over a flat surface the gravitational weight will still affect the friction of the bearings. Shaft power produced from a direct current (DC) electrical motor: P shaft_kW = … Without knowing the efficiency of the motor, you cannot accurately predict the electrical power consumption. Moving on to the engine size, if you’re a bicycle purist looking for a little pedal assist, 250 watts is a great compact choice to give a boost to your biking experience. Also, you can easily change the value multiplier such as kilo, mega or micro, Milli etc. Electric motor power is stated in watts. The motor won't get me over the hill on its own, I have to help. The first Grayborg frames used a common bicycle 135mm spacing between the drop-outs, and the motor did not have the mounting flange for a disc brake on the left. It is important to note that when buying light bulbs, wattage does not equal brightness. 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