# How is hp efficiency calculated?

## How is hp efficiency calculated?

Electrical Motor Efficiency Formula Here, ​hp​ = motor horsepower, ​load​ = Output power as a percentage of rated power, and ​​P​i​ = input power in kW. The constant factor 0.7457 is used to convert horsepower to kilowatts. This is because 1 hp = 745.7 W, or 0.7457 kW.

## How is Fla calculated?

The motor FLA calculator uses the following formulas:

1. Single Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × cos ϕ)
2. Single Phase AC Motor FLA (Amperes) = (P [HP] × 746) / (V × cos ϕ × η)
3. Three Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × 1.732 × cos ϕ)

How much power does a 20 hp motor use?

If the motor actually delivers 20 horsepower (hp) of mechanical power, then the motor will draw 49 amps.

How to calculate the efficiency of a motor?

Instructions: 1 Select the number of phases from the drop-down list 2 Enter the motor rated voltage in volts (V) 3 Enter the motor power rating and select the appropriate unit (HP or kW) 4 Enter the power factor and efficiency of the motor 5 Click on the “Calculate” button to see the results.

### How to calculate horsepower and amps for a motor?

Amps = HP × 746 V × η × PF. Thus, the current in amps is equal to horsepower times 746 divided by the voltage times the efficiency η times the power factor. For example, let’s find the current draw in amps of a 1 horsepower motor that runs at 120 volts with a 90% efficiency. Amps = 1 HP × 746 W 120 V × .9. Amps = 746 120 V × .9.

### What’s the average efficiency of a 10 horsepower motor?

Thus, a 10-horsepower (hp) motor has an acceptable load range of 5 to 10 hp; peak efficiency is at 7.5 hp. A motor ’s efficiency tends to decrease dramatically below about 50% load. However, the range of good efficiency varies with individual motors and tends to extend over a broader range for larger motors, as shown in Figure 1.

How to calculate single phase AC for HP motor?

Example: Find the current passing through 24 volt, 1/2 HP motor having an efficiency of 95%. Solution: Current = [0.5 * 746] / [24 volt * 0.95] = 16.35 Amps Single phase AC Calculations The single phase AC calculations involve the power factor in denomatior of equation.