Question 1

How do I use this wattage chart to size a generator?

Accepted Answer

Find each appliance you plan to run, add up all the running watts, then add the single highest starting watts from your list, then multiply by 1.2 for a safety margin. That total is the minimum generator size in watts you should buy.

Question 2

Why do some appliances have much higher starting watts?

Accepted Answer

Anything with an electric motor — fridges, AC units, pumps, power tools — needs a surge of 2 to 5 times its running watts for a few seconds to get the motor spinning. Heating elements and electronics have no surge, so their starting watts equal their running watts.

Question 3

Where can I find my appliance's exact wattage?

Accepted Answer

Check the nameplate label on the appliance (usually on the back or bottom), the owner's manual, or the manufacturer's spec sheet online. If only amps are listed, multiply amps × volts (usually 120) to get watts.

Question 4

What if my appliance isn't on the chart?

Accepted Answer

Use the closest similar appliance as a starting point, or estimate: for motor-driven items, assume starting watts of 2 to 3 times the running watts. When in doubt, round up — a slightly larger estimate is safer than an undersized generator.

Question 5

Do LED bulbs really use only 10 watts?

Accepted Answer

Yes — a standard LED bulb draws about 8 to 12 watts while matching the brightness of an old 60-watt incandescent. That's why lighting barely moves the needle in generator sizing, and why switching to LEDs before an outage season is smart.

Generator Wattage Chart — Running & Starting Watts

How to Use This Chart

Wattage Chart FAQ

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