We can also rewrite the outcome using scientific notation, P = 8.8×10⁻² hp. Rearrange the formula of hp to amps for the three-phase line-to-line system P = I × √3 × V × PF × η / 746.Īpply the values (we can approximate the square root of 3 as 1.73), P = 0.5 × 1.73 × 100 × 0.8 × 95% / 746. What is the motor's nominal power if it runs with the applied three-phase line-to-line voltage of 100 V, the flowing current equals 0.5 A, while the efficiency and power factor are 95% and 0.8, respectively? Let's see how to solve it: You can also use our tool as an amp to hp calculator. In this case, a 1 hp motor to amps gives 4.505 A. We round the outcome to four significant figures. Make a fraction of these numbers and find the final horsepower to amps value, 746 / 165.6 = 4.505 A. You can always convert a decimal to percent to make your life easier ( 90% = 0.9). ![]() Let's work out the result step by step using the appropriate horsepower to amps formula:Įstimate the power in watts (the nominator of the expression), 1 hp × 746 = 746 W.Įvaluate the product in the denominator, 200 V × 0.92 × 90% = 165.6 V. The engine's efficiency is 90%, while the power factor is 0.92. The engine's designed power is 1 hp, and it works with a voltage equal to 200 V. Let's say we want to find the current flow in an AC single-phase motor. You can find a more detailed description with examples in Omni's power factor calculator. Our 3 phase calculator is a comprehensive tool it can determine the value of current, voltage, and power in your 3 phase circuit Also, we explain how to derive the 3 phase power equations in terms of line quantities for both star and delta systems. The resistive-only loads result in values close to unity. PF is the power factor that tells us about the nature of the source. We can distinguish three different cases: The hp to amps calculations change a little for alternating current (AC). However, using our hp to amps calculator, you don't need to bother about unit conversion at all, as the tool converts between units automatically, so simply choose the one you work with! It means that the phase current in amps is computed by 1000 multiplied by the power in kilowatts divided by the square root of three multiplied by the power factor times the line to line voltage RMS in volts. ![]() Here we are assuming you're using electrical horsepower (for mechanical horsepower, the factor is circa 745.7). Calculation of AC three phase Kilowatts to amps Line to line Voltage I (A) 1000 x P (kW) / (3 x PF x V L-L (V)). A rule of thumb states that you should multiply the power in hp by 746 to get the power in watts. Knowing that we can write the hp to amps formula for direct current (DC) as:Īs the SI unit of power is the watt, it's common to use power converter before estimating the amperage. However, it changes a bit in real-life applications, as any power engine works with a certain efficiency, η. According to Ohm's law, the output current I is a ratio of the power P and the output voltage V.
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