Pressure washers & generators

Generator breaker keeps tripping under load

A tripping breaker usually means you're asking the generator for more power than it can supply, especially from appliances with a high startup surge, though a genuine short or a failing breaker are also possible.

Difficulty
Easy
Time
15–30 minutes
DIY cost
$0–$30
Pro cost
$70–$150

Symptoms

  • Breaker trips as soon as an appliance is plugged in
  • Breaker trips only when a specific device starts up
  • Generator runs fine with nothing connected
  • Breaker won't stay reset at all

Likely causes

  • CommonTotal connected load exceeds the generator's rated wattageAdding up the running watts of everything plugged in, plus the startup surge of motors, easily exceeds a generator's capacity.
  • CommonHigh-surge appliance startup (fridge, AC, power tools)Motors can draw 2–3 times their running wattage for a second or two at startup, which can trip a breaker even if the running load is fine.
  • PossibleFaulty extension cord or connected appliance with a shortA damaged cord or device can cause a real short that legitimately trips the breaker.
  • PossibleWorn or failing breaker on the generator itselfBreakers can weaken with age and trip below their rated threshold.

What to do

  1. Unplug everything and reset the breaker, then add devices back one at a time, noting the wattage of each.
  2. Add up the running and startup wattage of everything you intend to run, and compare it to the generator's rated wattage from its label or manual.
  3. Prioritize essential appliances and stagger startup, turning on one motor-driven device at a time rather than all at once.
  4. Inspect extension cords and plugged-in devices for damage, and try a different cord or device to isolate a short.
  5. If the breaker trips even with a light, single-device load well under rated capacity, the breaker itself may be failing.
  6. Avoid running space heaters or other very high-draw resistive loads alongside motor-driven appliances.
  7. If the breaker seems to trip below its rated capacity consistently, have a small-engine or generator repair shop test and replace it.

Tools and parts

  • None required for basic checks
Generator circuit breakerSearch: “portable generator circuit breaker replacement”

When to call a pro

If the breaker trips well below the generator's rated capacity, have it tested and replaced by a repair shop rather than continuing to reset it repeatedly.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.