How Many Amps Is 18 kW at 24V?

18 kW at 24V draws about 750 amps on an DC circuit at PF 0.85, typical for solar arrays, battery banks, and DC industrial equipment. Actual current varies with equipment power factor and duty cycle.

18 kW at 24V, DC (PF 0.85)

750 Amps

18 kilowatts at 24V on DC ≈ 750 amps

AC Single Phase (PF 0.85)882.35 A

Try: 20kW at 24V 15kW at 24V 22kW at 24V 12kW at 24V

Volts

Amps (DC)

750

Formulas

DC: kW to Amps

I_(A) = 1000 × P_(kW) ÷ V_(V)

1000 × 18 ÷ 24 = 18,000 ÷ 24 = 750 A

AC Single Phase (PF = 0.85)

I_(A) = 1000 × P_(kW) ÷ (PF × V_(V))

18,000 ÷ (0.85 × 24) = 18,000 ÷ 20.4 = 882.35 A

Equipment & Circuit Sizing

Energy Cost

18 kW costs $3.06/hour at $0.17/kWh (rates last reviewed April 2026). See breakdown.

Power Factor Reference (DC)

How the line current for 18 kW at 24V changes with load power factor, on the same DC circuit basis the rest of the page uses. DC has no power factor; PF 1.0 represents resistive AC loads.

Load Type	PF	18 kW at 24V (DC)
Resistive (heaters, incandescent)	1	750 A
Fluorescent lamps	0.95	750 A
LED lighting	0.9	750 A
Synchronous motors	0.9	750 A
Typical mixed loads	0.85	750 A
Induction motors (full load)	0.8	750 A
Computers (without PFC)	0.65	750 A
Induction motors (no load)	0.35	750 A

AC Conversion Comparison

On DC, 18kW at 24V draws 750A. AC single-phase at PF 0.85 pulls 882.35A because reactive current is added on top of the real power.

Circuit Type	Formula	Result
DC	18,000 ÷ 24	750 A
AC Single Phase (PF 0.85)	18,000 ÷ (0.85 × 24)	882.35 A

Other kW Values at 24V

kW	DC Amps	AC 1-Phase PF 0.85
3 kW	125 A	147.06 A
3.5 kW	145.83 A	171.57 A
4 kW	166.67 A	196.08 A
5 kW	208.33 A	245.1 A
6 kW	250 A	294.12 A
7.5 kW	312.5 A	367.65 A
8 kW	333.33 A	392.16 A
10 kW	416.67 A	490.2 A
12 kW	500 A	588.24 A
15 kW	625 A	735.29 A
18 kW	750 A	882.35 A
20 kW	833.33 A	980.39 A
22 kW	916.67 A	1,078.43 A
25 kW	1,041.67 A	1,225.49 A
30 kW	1,250 A	1,470.59 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.

electrical_services 18 kW at 120V = 176.47A (1-phase) electrical_services 18 kW at 208V = 58.78A (3-phase) electrical_services 18 kW at 220V = 96.26A (1-phase) electrical_services 18 kW at 230V = 92.07A (1-phase) electrical_services 18 kW at 240V = 88.24A (1-phase) electrical_services 18 kW at 400V = 30.57A (3-phase) electrical_services 18 kW at 460V = 26.58A (3-phase) electrical_services 18 kW at 480V = 25.47A (3-phase) electrical_services 18 kW at 575V = 21.26A (3-phase)

Related Calculations

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Frequently Asked Questions

How many amps is 18 kW at 24V?expand_more

18 kW at 24V draws about 750 amps on DC. Alternate cases at the same voltage: 882.35A on AC single-phase.

How much does 18 kW cost to run?expand_more

18 kW costs $3.06 per hour at $0.17/kWh (US residential average, last reviewed April 2026). At 8 hours/day that is $734.40 per month.

What size breaker would I need for 18 kW at 24V?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.

Is 18 kW single-phase or three-phase?expand_more

18 kW is typically three-phase in commercial and industrial settings.

What is 18 kW in watts?expand_more

18 kW equals 18,000 watts. Multiply kilowatts by 1000.

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.