How Many Amps Is 13.78 kW at 480V?

13.78 kilowatts at 480V works out to roughly 19.5 amps on AC three-phase at PF 0.85. That is typical for commercial HVAC, industrial motors, rooftop units, and three-phase panel loads. See the DC and alternate-phase numbers below for other circuit types.

13.78 kW at 480V, AC three-phase (PF 0.85)

19.5 Amps

13.78 kilowatts at 480V on AC three-phase ≈ 19.5 amps

AC Single Phase (PF 0.85)33.77 A

DC (ideal baseline)28.71 A

Try: 15kW at 480V 12kW at 480V 10kW at 480V 18kW at 480V

Volts

Amps (AC three-phase, PF 0.85)

19.5

Formulas

DC: kW to Amps

I_(A) = 1000 × P_(kW) ÷ V_(V)

1000 × 13.78 ÷ 480 = 13,780 ÷ 480 = 28.71 A

AC Single Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (PF × V_(V))

13,780 ÷ (0.85 × 480) = 13,780 ÷ 408 = 33.77 A

AC Three Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (√3 × PF × V_L-L), where V_L-L is the line-to-line voltage

13,780 ÷ (1.732 × 0.85 × 480) = 13,780 ÷ 706.66 = 19.5 A

Equipment & Circuit Sizing

Breaker Sizing

Breaker ratings are in amps, not watts, so the real install answer depends on the equipment nameplate FLA, whether the load is continuous (NEC 210.19(A) sizes the conductor and OCP at 125% of a continuous load, equivalently 80% of breaker rating), conductor ampacity and temperature rating, ambient and bundling derates, and any motor or HVAC provisions (NEC 430 / 440). At roughly 19.5A on AC three-phase at 480V, the load sits in the bracket between a 20A standard size (non-continuous) and the next size up that covers a continuous load under 210.19(A) (around 25A). The actual install pick depends on whether the load is continuous and the factors above; a conversion page can't pick a single "right" breaker from the amp draw alone.

Energy Cost

13.78 kW costs $2.34/hour at $0.17/kWh (rates last reviewed April 2026). See breakdown.

Power Factor Reference (AC three-phase)

How the line current for 13.78 kW at 480V changes with load power factor, on the same AC three-phase circuit basis the rest of the page uses. DC has no power factor; PF 1.0 represents resistive AC loads.

Load Type	PF	13.78 kW at 480V (AC three-phase)
Resistive (heaters, incandescent)	1	16.57 A
Fluorescent lamps	0.95	17.45 A
LED lighting	0.9	18.42 A
Synchronous motors	0.9	18.42 A
Typical mixed loads	0.85	19.5 A
Induction motors (full load)	0.8	20.72 A
Computers (without PFC)	0.65	25.5 A
Induction motors (no load)	0.35	47.36 A

AC Conversion Comparison

On DC, 13.78kW at 480V draws 28.71A. AC single-phase at PF 0.85 pulls 33.77A because reactive current is added on top of the real power. Three-phase at the same voltage needs only 19.5A per line since the same 13.78kW is shared across three conductors instead of one.

Circuit Type	Formula	Result
DC	13,780 ÷ 480	28.71 A
AC Single Phase (PF 0.85)	13,780 ÷ (0.85 × 480)	33.77 A
AC Three Phase (PF 0.85)	13,780 ÷ (1.732 × 0.85 × 480)	19.5 A

Other kW Values at 480V

kW	AC 3-Phase per line, PF 0.85	AC 1-Phase PF 0.85
2.5 kW	3.54 A	6.13 A
3 kW	4.25 A	7.35 A
3.5 kW	4.95 A	8.58 A
4 kW	5.66 A	9.8 A
5 kW	7.08 A	12.25 A
6 kW	8.49 A	14.71 A
7.5 kW	10.61 A	18.38 A
8 kW	11.32 A	19.61 A
10 kW	14.15 A	24.51 A
12 kW	16.98 A	29.41 A
15 kW	21.23 A	36.76 A
18 kW	25.47 A	44.12 A
20 kW	28.3 A	49.02 A
22 kW	31.13 A	53.92 A
25 kW	35.38 A	61.27 A

Same kW, Other Voltages

Each destination page leads with the interpretation most common for that voltage, so the amps shown below use the same basis as the page you'd land on: single-phase for residential voltages, three-phase for commercial/industrial panel voltages, DC for low-voltage.

Related Calculations

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Frequently Asked Questions

How many amps is 13.78 kW at 480V?expand_more

13.78 kW at 480V draws about 19.5 amps on an AC three-phase circuit at PF 0.85. Alternate cases at the same voltage: 28.71A on DC, 33.77A on AC single-phase.

How does three-phase affect the amps for 13.78 kW?expand_more

Three-phase at 480V draws 19.5A per line versus 33.77A single-phase. Less current per conductor means smaller wire and lower I²R losses.

What size breaker would I need for 13.78 kW at 480V?expand_more

This is a sizing question, not a conversion question, and there is no single correct answer from a page like this. Breaker selection depends on the equipment nameplate FLA, whether the load is continuous (NEC 210.19(A) applies the 125% continuous-load rule), the conductor ampacity and temperature rating, any NEC 430/440 motor or HVAC provisions, and local code interpretation. Use the nameplate and a licensed electrician for the real install value; use this page only for the current-draw estimate that feeds into that process.

What is 13.78 kW in watts?expand_more

13.78 kW equals 13,780 watts. Multiply kilowatts by 1000.

Is 13.78 kW single-phase or three-phase?expand_more

13.78 kW is available in both, but three-phase is more common for commercial HVAC, rooftop units, and motors once you reach this range.

This calculator provides estimates for reference purposes only. Always consult a licensed electrician and verify compliance with the National Electrical Code (NEC) and local electrical codes before performing any electrical work.