swap_horiz Looking to convert 2,880W at 24V back to amps?

How Many Watts Is 120 Amps at 24V?

120 amps at 24V equals 2,880 watts on a DC circuit.

At 2,880W, this is equivalent to 2.88 kW. NEC 210.19(A) sizes the conductor and OCP at 125% of any continuous load (equivalently 80% of breaker rating), so the usable continuous capacity on this circuit is about 2,304W.

120 amps at 24V
2,880 Watts
120 amps equals 2,880 watts at 24 volts (DC)

For comparison at the same inputs: 2,448W on AC single-phase at PF 0.85. These are reference values for contrast; the canonical answer for this page is the one in the hero above.

Try: 125A at 24V 100A at 24V 150A at 24V 80A at 24V
2,880

Assumes a DC circuit. Typing a commercial L-L voltage (208/400/480V) re-routes the result to three-phase; 277V stays on single-phase because it's the L-N lighting leg of a 480Y/277V wye; 12/24V re-routes to DC.

Formulas

DC: Amps to Watts

P(W) = I(A) × V(V)

120 × 24 = 2,880 W

AC Single Phase (PF = 0.85)

P(W) = PF × I(A) × V(V)

0.85 × 120 × 24 = 2,448 W

What Uses 120A at 24V?

Load Context at 24V

24V is a low-voltage DC context (automotive, solar, battery-bank, and industrial-control systems). At 120A on a 24V DC circuit, load sizing is driven by the specific DC device's spec sheet, not a generic appliance lookup.

Monthly Running Cost

As a rough reference, running 2,880W for 8 hours daily at the US residential average of $0.17/kWh works out to about $117.50 per month. Electricity rates change every tariff cycle and vary sharply by region, time of day, and utility; treat the number here as a ballpark and check your actual bill or the energy-cost calculator with your own rate for a real figure.

Standard Breaker Sizes Near 120A

This section is reference framing, not an install recommendation. NEC 240.6(A) lists the standard breaker amp ratings, and under the NEC 210.19(A) 125% continuous-load rule (equivalently 80% of breaker rating) a 120A non-continuous load maps to the 125A standard size at or above the load, and a continuous 120A load maps to 150A once the 125% factor is applied. Breaker ratings are expressed in amps, not watts: the real power associated with a given breaker size depends on the circuit type and the load's power factor, which is why the AC Conversion Detail section shows multiple wattage interpretations. None of these numbers is a breaker selection for a real install. Actual breaker and conductor selection depends on the equipment nameplate FLA, continuous-load treatment, conductor ampacity and termination temperature rating, bundling and ambient derates, any NEC 430/440 motor or HVAC provisions, and local code, and should be made by a licensed electrician against the specific install conditions.

AC Conversion Detail

On DC, 120A at 24V delivers a full 2,880W. On AC single-phase with a power factor of 0.85, the same current only delivers 2,448W of real power because the remaining capacity goes to reactive current.

Circuit TypeFormulaResult
DC120 × 242,880 W
AC Single Phase (PF 0.85)0.85 × 120 × 242,448 W

Power Output by Load Type

The same 120A circuit at 24V delivers different real power depending on the load, computed on the same single-phase basis the rest of the page uses:

Load TypePFReal Power (120A at 24V, single-phase)
Resistive (heaters, incandescent)12,880 W
Fluorescent lamps0.952,736 W
LED lighting0.92,592 W
Synchronous motors0.92,592 W
Typical mixed loads0.852,448 W
Induction motors (full load)0.82,304 W
Computers (without PFC)0.651,872 W
Induction motors (no load)0.351,008 W

Other Amperages at 24V

AmpsDC WattsAC Watts (PF 0.85)
20A480 W408 W
25A600 W510 W
30A720 W612 W
35A840 W714 W
40A960 W816 W
45A1,080 W918 W
50A1,200 W1,020 W
60A1,440 W1,224 W
70A1,680 W1,428 W
80A1,920 W1,632 W
100A2,400 W2,040 W
125A3,000 W2,550 W
150A3,600 W3,060 W
175A4,200 W3,570 W
200A4,800 W4,080 W

Same Amperage, Other Voltages

electric_bolt120A at 12V = 1,440WDC electric_bolt120A at 100V = 12,000W1Φ, PF 1.0 electric_bolt120A at 120V = 14,400W1Φ, PF 1.0 electric_bolt120A at 208V = 36,747.19W3Φ L-L, PF 0.85 electric_bolt120A at 220V = 26,400W1Φ, PF 1.0 electric_bolt120A at 230V = 27,600W1Φ, PF 1.0 electric_bolt120A at 240V = 28,800W1Φ, PF 1.0 electric_bolt120A at 400V = 70,667.67W3Φ L-L, PF 0.85 electric_bolt120A at 460V = 81,267.82W3Φ L-L, PF 0.85 electric_bolt120A at 480V = 84,801.21W3Φ L-L, PF 0.85 electric_bolt120A at 575V = 101,584.78W3Φ L-L, PF 0.85

Related Calculations

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Frequently Asked Questions

120 amps at 24V equals 2,880 watts on a DC circuit. Actual real power on a real install depends on the load's actual power factor, which can be lower than the figure above for motor and inductive loads.
Amps measure current flow (how much electricity moves through the wire). Watts measure real power (how much work the electricity does). You need voltage to convert between them, and on AC you also need the load's power factor, because reactive current raises amps without raising real power.
120A on 24V is a heavy residential load: a sub-panel feeder, a service entrance for a small dwelling, or a high-current dedicated appliance circuit.
Wire sizing depends on run length, source voltage, voltage-drop target, conductor insulation and termination temperature, cable type, and ambient and bundling conditions. For typical short runs at 24V check the dedicated wire-size calculator with your actual variables.
A 120A circuit at 24V DC delivers 2,880W. Low-voltage DC loads are usually driven by the equipment spec (motor, charge controller, accessory bus) rather than a watts-per-amp breakdown.
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.
person Written by Sean Day verified Reviewed by WireResult update Last updated Apr 11, 2026