Motor kW to FLA Calculator
Convert motor power in kilowatts (kW) to Full Load Amps (FLA)
kW to FLA Calculator
For AC Motor Systems
Results:
Full Load Amps (FLA): 0.00
How to Use the Calculator
AC Single Phase Motor
- Select "AC" system type
- Choose "Single Phase"
- Enter motor power in Kilowatts (kW)
- Provide line-to-neutral voltage (V)
- Input power factor (0-1)
- Enter motor efficiency (0-100%)
AC Three Phase Motor
- Select "AC" system type
- Choose "Three Phase"
- Enter motor power in Kilowatts (kW)
- Provide line-to-line voltage (V)
- Input power factor (0-1)
- Enter motor efficiency (0-100%)
Important Notes
- This calculator is for AC motors.
- Efficiency and Power Factor are crucial for accurate results.
- Use nameplate data for best accuracy.
Motor Power Fundamentals
Full Load Amps (FLA)
FLA is the current drawn by a motor when operating at its rated horsepower or kilowatt output, voltage, and frequency. It's crucial for proper motor protection and wiring sizing.
- Determines circuit breaker/fuse size
- Influences wire gauge selection
- Indicates motor's operating current
Kilowatts (kW)
Kilowatts represent the actual power consumed by the motor and converted into mechanical work, considering its efficiency and power factor.
- Real power consumption
- Used for energy billing
- Directly related to mechanical output
Key Factors:
Power Factor (PF): Ratio of real power to apparent power.
Efficiency (η): Ratio of mechanical power output to electrical power input.
Calculation Formulas
AC Single Phase:
FLA = (kW × 1000) / (V × PF × η)
AC Three Phase:
FLA = (kW × 1000) / (√3 × V × PF × η)
Where: kW = Kilowatts, V = Voltage, PF = Power Factor, η = Efficiency (as a decimal)
Example Calculation
Three Phase AC Motor:
Kilowatts (kW): 15 kW
Voltage (V): 400 V
Power Factor (PF): 0.85
Efficiency (η): 90% (0.90)
FLA = (15 × 1000) / (√3 × 400 × 0.85 × 0.90)
FLA = 15000 / (1.732 × 400 × 0.85 × 0.90)
FLA = 15000 / 530.676
FLA ≈ 28.27 Amps
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