Amps to kW 480V
Convert current to kW on a 480 V supply and compare how much more power the same current carries than at lower voltages.
Inputs
Same current at other voltages
How amps to kW 480V calculator works
The amps to kW 480V calculator converts line current into kilowatts (kW) on a 480 V supply with 3 inputs: current, power factor and phase. The column chart compares the same current at 9 voltages from 120 V to 600 V.
P = √3 × I × 480 × PF / 1000200 A at 480 V three phase and PF 0.9 gives 149.65 kW. The same 200 A at 208 V gives 64.85 kW.
Amps to kW 480V formula
The amps to kW 480V formula is P(kW) = √3 × I × 480 × PF / 1,000. There are 3 formulas on a 480 V system: three phase, 480 V single phase and 277 V single phase.
Three phase 480 V
P = √3 × I × 480 × PF / 10001.732 × 200 A × 480 V × 0.9 / 1,000 = 149.65 kW
Single phase 480 V
P = I × 480 × PF / 100030 A × 480 V / 1,000 = 14.4 kW
Single phase 277 V
P = I × 277 × PF / 100020 A × 277 V / 1,000 = 5.54 kW
480Y/277 V is the standard commercial and industrial supply in the United States and Canada: 480 V feeds motors and chillers, and 277 V feeds lighting. National Electrical Manufacturers Association (NEMA) motors list 460 V on the nameplate for 480 V systems.
Amps to kW 480V conversion chart
The amps to kW 480V conversion chart lists 13 line currents from 10 A to 1,000 A at 480 V: three phase at power factor 1, 0.9 and 0.85, single phase at 480 V and single phase at 277 V.
| Amps | 480 V 3φPF 1 | 480 V 3φPF 0.9 | 480 V 3φPF 0.85 | 480 V 1φPF 1 | 277 V 1φPF 1 |
|---|---|---|---|---|---|
| 10 A | 8.31 | 7.48 | 7.07 | 4.8 | 2.77 |
| 20 A | 16.63 | 14.96 | 14.13 | 9.6 | 5.54 |
| 30 A | 24.94 | 22.45 | 21.2 | 14.4 | 8.31 |
| 50 A | 41.57 | 37.41 | 35.33 | 24 | 13.85 |
| 60 A | 49.88 | 44.89 | 42.4 | 28.8 | 16.62 |
| 100 A | 83.14 | 74.82 | 70.67 | 48 | 27.7 |
| 150 A | 124.71 | 112.24 | 106 | 72 | 41.55 |
| 200 A | 166.28 | 149.65 | 141.34 | 96 | 55.4 |
| 225 A | 187.06 | 168.36 | 159 | 108 | 62.33 |
| 400 A | 332.55 | 299.3 | 282.67 | 192 | 110.8 |
| 600 A | 498.83 | 448.95 | 424.01 | 288 | 166.2 |
| 800 A | 665.11 | 598.6 | 565.34 | 384 | 221.6 |
| 1,000 A | 831.38 | 748.25 | 706.68 | 480 | 277 |
A 1,000 A, 480 V switchboard carries 831 kW at PF 1.
Amps to kW 480V Excel formula
The amps to kW 480V Excel formula is =SQRT(3)*A2*480*B2/1000 with line amps in A2 and power factor in B2.
| A | B | C | D | E | |
|---|---|---|---|---|---|
| 1 | Amps | Volts | PF | kW | Formula in D |
| 2 | 200 | 480 | 0.9 | 149.65 | =ROUND(SQRT(3)*A2*B2*C2/1000,2) |
| 3 | 100 | 480 | 1 | 83.14 | =ROUND(SQRT(3)*A3*B3*C3/1000,2) |
| 4 | 20 | 277 | 1 | 5.54 | =ROUND(A4*B4*C4/1000,2) |
Row 4 is a 277 V lighting circuit.
Amps to kW 480V equation
The amps to kW 480V equation is P = √3 × I × 480 × PF / 1,000 for a three-phase supply.
- P
- Total real power in kW
- I
- Line current in amperes (A)
- 480
- Line-to-line voltage (V)
- PF
- Power factor
Each amp at 480 V three phase and PF 1 adds 0.831 kW, 2.31 times the kW per amp at 208 V.
Amps to kW 480V FAQ
How many kW is 100 amps at 480V?
100 amps at 480V three phase is 83.14 kW at a power factor of 1 and 74.82 kW at 0.9.
How many kW is 200 amps at 480V?
200 amps at 480V three phase is 166.28 kW at a power factor of 1 and 149.65 kW at 0.9.
How many amps is 100 kW at 480V?
100 kW at 480V three phase is 120.28 A per line at a power factor of 1 and 133.65 A at 0.9.
What is 277V on a 480V system?
277V is the line-to-neutral voltage of a 480V three-phase system (480 ÷ √3), used for commercial lighting.