How Many Amps Do Outdoor String Lights Use?
Outdoor String Lights draws about 0.13 amps at 120 volts (15 watts running). At 0.13 A, outdoor string lights fits comfortably on a standard 15 A or 20 A household circuit.
Amps = watts ÷ volts. Enter the wattage from your appliance's nameplate or label for an exact figure.
Current draw: outdoor string lights
0.1 A
- At 120 V
- 15 W
- Typical breaker
- 15 A
Breaker figure is guidance for a simple resistive load, sized at 125% for continuous running; confirm against the nameplate and a licensed electrician.
Outdoor String Lights amperage at 120 V and 240 V
Same 15 W load: the current halves when the voltage doubles. Outdoor String Lights is typically a 120 V appliance in US homes.
| Draw | Watts | Amps at 120 V | Amps at 240 V |
|---|---|---|---|
| Running | 15 W | 0.13 A | 0.06 A |
Breaker and circuit for outdoor string lights
At 0.13 A, outdoor string lights fits comfortably on a standard 15 A or 20 A household circuit. For a dedicated circuit, guidance is a 15 A breaker with 14 AWG copper (75°C terminations), sized at 125% of the running current because it runs 3+ hours at a time (NEC 210.20).
Guidance only: actual circuit sizing depends on your unit's nameplate, wire run length, and local code. Confirm with a licensed electrician. See the wire & breaker size chart for the full NEC ampacity table.
Measure what outdoor string lights actually draws
The figures above are typical ratings. A plug-in power meter between the outlet and the cord shows the real amps and watts with nothing opened up. A clamp meter reads one conductor at a time, so it is the tool for hardwired and 240 V circuits; clamped around a whole cord it reads close to zero.
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Plug-in power meter
P3 International Kill A Watt P4400
Best for: Measuring what one plug-in appliance really uses
Clamp meter
Fluke 323
Best for: Measuring what a hardwired circuit actually draws, even in a crowded panel
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