How Many Amps Is 15 kVA at 575V?

At 575V, a 15 kVA three-phase load draws 15.06 amps per line. kVA is apparent power, so the current is set by kVA and the voltage alone, without a power-factor term. The equivalent single-phase current at this voltage is 26.09 amps.

15 kVA equals 15.06 amps at 575 volts (three-phase, L-L)

15.06 Amps

Single Phase (575V)26.09 A

Try: 10kVA at 575V 20kVA at 575V 7.5kVA at 575V 5kVA at 575V

kVA

Volts

Amps (3Φ per line)

15.06

Assumes an AC three-phase line-to-line circuit at the input voltage. kVA is apparent power, so no power factor term is involved.

Formulas

Single Phase

I_(A) = (kVA × 1000) ÷ V

(15 × 1000) ÷ 575 = 15,000 ÷ 575 = 26.09 A

Three Phase (575V Line-to-Line)

I_(A) = (kVA × 1000) ÷ (V_L-L × √3)

15,000 ÷ (575 × 1.732) = 15,000 ÷ 995.9 = 15.06 A

Single Phase vs Three Phase

The same 15 kVA unit draws very different current depending on the phase configuration:

Configuration	Formula	Current at 575V
Single Phase	15,000 ÷ 575	26.09 A
Three Phase (575V L-L)	15,000 ÷ (575 × √3)	15.06 A

For this specific case, 15 kVA at 575V, three-phase carries about 42.26% less current per line than single-phase at the same voltage. That gap tracks the 1 ÷ √3 factor for L-L three-phase (or 1 ÷ 3 for L-N), which is why three-phase distribution is common at commercial and industrial scale: the same apparent power rides on smaller conductors and smaller breakers.

Generator & UPS Sizing

Load-Side Real Power by Power Factor

A load with an apparent power of 15 kVA draws different amounts of real power depending on the load's own power factor. The table below is a load-side conversion, not a forecast of what a generator or UPS will output for that load: generators and UPS units publish their own independent kW rating set by the engine or inverter design, and that rating is often lower than kVA × the load's PF.

Load Type	Load PF	Load Real Power (kW)	Current at 575V (three-phase, per line)
Resistive (heaters, lights)	1.0	15 kW	15.06 A per line
Mixed typical	0.85	12.75 kW	15.06 A per line
Motors/HVAC	0.80	12 kW	15.06 A per line
Computers/servers (no PFC)	0.65	9.75 kW	15.06 A per line

Note: current draw stays the same across the rows because kVA sets the current, not the load's power factor. PF only affects how much real work (kW) the load does per amp drawn.

Sizing a load against a source. If you are feeding this load from a UPS, generator, or transformer, check the load against both the source's kVA rating AND the source's kW rating. Those are two independent numbers published by the manufacturer. A 10 kVA / 8 kW generator, for example, can supply up to 10 kVA of apparent power AND up to 8 kW of real power, whichever limit is reached first. Do not use the kW figures above as a substitute for the source's published kW rating.

Circuit Sizing: Starting Points

The numbers below are rough order-of-magnitude starting points under typical assumptions (copper conductors, 75°C terminations, short run, no ambient or bundling derates, non-continuous duty). They are not install specs. Actual breaker and wire selection depends on the equipment nameplate, conductor and termination temperature ratings, cable type, run length and voltage-drop target, ambient and bundling conditions, whether the load is continuous, any NEC 430/440 motor or HVAC provisions, and local code.

	Single Phase	Three Phase
Current draw (at full kVA)	26.09 A	15.06 A
Ballpark branch OCP	~30A	~20A

For a real install, run the full wire-size calculator with your actual run length, voltage, and drop target, and verify breaker selection against the equipment nameplate and local code.

Energy Cost at Full Load

A load with an apparent power of 15 kVA at load PF 0.85 draws 12.75 kW of real power. Running cost at that draw: $2.17/hour at $0.17/kWh (rates last reviewed April 2026), or $520.20/month (8h/day). Full breakdown.

kW Equivalent

15 kVA at PF 0.85 = 12.75 kW. See 12.75 kW to amps at 575V.

Other kVA Ratings at 575V

kVA	Three Phase Amps (L-L, per line)	Single Phase Amps	Real Power (PF 0.8)
1 kVA	1 A	1.74 A	0.8 kW
2 kVA	2.01 A	3.48 A	1.6 kW
3 kVA	3.01 A	5.22 A	2.4 kW
5 kVA	5.02 A	8.7 A	4 kW
7.5 kVA	7.53 A	13.04 A	6 kW
10 kVA	10.04 A	17.39 A	8 kW
15 kVA	15.06 A	26.09 A	12 kW
20 kVA	20.08 A	34.78 A	16 kW
25 kVA	25.1 A	43.48 A	20 kW
30 kVA	30.12 A	52.17 A	24 kW
40 kVA	40.16 A	69.57 A	32 kW
50 kVA	50.2 A	86.96 A	40 kW

Frequently Asked Questions

How many amps is 15 kVA at 575V?expand_more

15 kVA at 575V is 15.06 amps per line on a three-phase circuit, or 26.09 amps on single-phase at the same voltage.

Can a 15 kVA generator run my whole house?expand_more

A 15 kVA unit can cover most residential loads but often struggles with central AC plus other large appliances running simultaneously. Capacity depends on inrush from compressors and motors, load sequencing, and any transfer-switch load management. An electrician can run a load calc to confirm.

Why are UPS and generators rated in kVA not kW?expand_more

Because the current on the output (and therefore the conductor, switchgear, and winding sizing) is set by apparent power, kVA = V×I, regardless of the load's power factor. UPS and generator manufacturers publish a separate kW rating in addition to the kVA rating, set by the inverter or engine design, and it is often lower than the kVA rating. You cannot derive a UPS or generator's kW output from its kVA rating and the load's power factor: the two ratings are independent specs and a load has to fit under each of them when sizing against the source.

How much fuel does a 15 kVA generator use?expand_more

Fuel burn is set by the generator's specific-fuel-consumption curve, not a rule of thumb tied to the kVA rating. It varies sharply with fuel type (gasoline vs diesel vs natural gas vs propane), load percentage (partial-load efficiency is much worse than full-load), engine size and age, altitude, and ambient temperature. For a specific unit, check the manufacturer's fuel-consumption curve at your expected load percentage. Generic per-hour estimates from the kVA rating alone are not reliable enough to plan fuel capacity from.

Three-phase vs single-phase for 15 kVA?expand_more

Three-phase draws 15.06A per line. Single-phase at the same voltage draws 26.09A. Three-phase delivers the same apparent power across three conductors, so each line carries less current and the wire and breakers can be smaller for the same kVA.

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.