How Many Amps Is 15,000 Watts?

Answer
125.0 A at 120 V · 62.5 A at 240 V

Amps = watts ÷ volts. A 15,000 W resistive load draws 125.0 A at 120 V and 62.5 A at 240 V. That is too much for a 120 V circuit, so loads this size run on 240 V.

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1.0 for heaters and lights; 0.8–0.9 for motors.
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    Amps, breaker and wire by voltage

    VoltageCurrentBreaker (continuous)Copper wire
    120 V125.0 AUse 240 V–
    208 V72.1 A100 A3 AWG
    240 V62.5 A80 A4 AWG
    480 V 3-phase18.04 A––

    Breaker sized at 125% for continuous loads (NEC 210.20). Motors and electronics draw more current than watts ÷ volts because of power factor.

    Frequently asked questions

    Can a 15 amp circuit handle 15,000 watts?

    No. A 15 A circuit at 120 V supplies at most 1,800 W. Use a 20 A circuit (up to 2,400 W) or a 240 V circuit.

    How many amps is 15,000 watts at 12 volts?

    1,250 A at 12 V DC, before inverter losses (about 1,389 A through a 90% efficient inverter).

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