What Will a 10000-Watt Generator Run?
By the Generator Size Calculator Team · Updated · 8 min read
Quick answer: A 10000-watt generator can back up most of a home's essentials, including a 2-ton central AC, a refrigerator, a sump pump, a furnace fan, a microwave and lights at the same time. An electric dryer or a range element can be added if you take turns. It is not quite a whole-house generator for a large all-electric home. This guide assumes 10,000 running and about 12,500 starting watts.
What "10,000 watts" means on your generator
Generators list running watts (what they can supply for hours) and starting watts (a short burst for motors). Make sure the 10,000 is running watts. Some 10,000-watt models list peak watts and give about 8,000 running.
This guide assumes about 10,000 running watts and 12,500 starting watts. Check the label on yours. Anything with a motor or compressor needs extra watts for a moment to start, and lights, TVs and heating elements draw about the same all the time. See starting vs running watts.
10,000-watt generator appliance chart
Typical figures from Honda's wattage guide. The last column judges each appliance against 10,000 running watts, an 80% limit of 8,000 watts and about 12,500 starting watts. Your appliance may differ, so check its label.
| Appliance | Running watts | Starting watts | On a 10,000 W generator |
|---|---|---|---|
| Refrigerator or freezer | 700 | 2,200 | Yes, with other loads |
| Sump pump, 1/3 HP | 750 | 1,500 | Yes, with other loads |
| Sump pump, 1/2 HP | 1,000 | 2,100 | Yes, with other loads |
| Sump pump, 1 HP | 2,300 | 4,500 | Yes, with other loads |
| Well pump, 1/3 HP | 1,000 | 3,000 | Yes, with other loads |
| Furnace fan, 1/3 HP | 1,000 | 1,800 | Yes, with other loads |
| Microwave (625 W) | 625 | 800 | Yes, with other loads |
| Coffee maker | 1,750 | 1,750 | Yes, with other loads |
| Toaster, 2-slice | 1,050 | 1,050 | Yes, with other loads |
| Dishwasher | 1,450 | 1,800 | Yes, with other loads |
| Washing machine | 1,150 | 2,300 | Yes, with other loads |
| Clothes dryer, gas | 700 | 1,800 | Yes, with other loads |
| Clothes dryer, electric | 5,750 | 1,800 | Yes, start it first |
| Electric range, one 8-inch element | 2,100 | 2,100 | Yes, with other loads |
| Space heater, high | 1,500 | 1,500 | Yes, with other loads |
| Central AC, 10,000 BTU | 1,500 | 2,200 | Yes, with other loads |
| Central AC, 20,000 BTU | 2,500 | 3,300 | Yes, with other loads |
| Central AC, 24,000 BTU | 3,800 | 4,950 | Yes, with other loads |
| Central AC, 40,000 BTU | 6,000 | 7,800 | Yes, start it first |
| Air compressor, 1 HP | 1,500 | 4,500 | Yes, with other loads |
| Welder, 100 amp | 3,600 | 3,600 | Yes, with other loads |
| TV | 300 | 300 | Yes, with other loads |
| Computer | 150 | 150 | Yes, with other loads |
| Garage door opener, 1/3 HP | 725 | 1,400 | Yes, with other loads |
LED bulbs use about 8 to 15 watts each, and chargers are tiny. For appliances not listed, use the generator wattage calculator.
Example: what a 10,000-watt generator can run at the same time
A realistic setup for a medium home with central air:
| Load | Running watts |
|---|---|
| Refrigerator | 700 |
| Central AC, 24,000 BTU | 3,800 |
| Sump pump, 1/2 HP | 1,000 |
| Furnace fan, 1/3 HP | 1,000 |
| Microwave | 625 |
| TV, lights, chargers, Wi-Fi | 475 |
| Running total | 7,600 |
The running total is 7,600 watts, under the 80% limit of 8,000 watts. Add only the largest extra start-up load. The fridge is 1,500 watts, more than the AC's 1,150. That gives a peak of about 9,100 watts, under the 12,500-watt starting capacity.
Add your own appliances and see the running and peak watts.
What a 10,000-watt generator can't run
A 10000-watt generator cannot run a 40,000 BTU central AC plus an electric dryer and range at the same time, or an all-electric large home. Adding an electric dryer (5,750 W) to the example brings the running load to 13,350 watts, over the generator's rating. Take turns with the dryer and the AC. A 200-amp welder at 9,000 watts exceeds the 80% mark.
Can a 10,000-watt generator run a house?
For many medium homes with gas heat, a 10000-watt generator with load management covers nearly everything. Larger homes or all-electric ones need 14 to 26 kW. See what size generator runs a whole house.
Tips to get more out of it
- Start the biggest motor first, with nothing else running, then add smaller loads.
- Take turns with heating appliances like the coffee maker, toaster and space heaters.
- Use heavy, outdoor-rated cords. See the extension cord calculator.
- Plan the fuel. See how long a generator runs on a tank of gas.
Safety rules
Run the generator outdoors, at least 20 feet from doors, windows and vents. Never in a garage or shed, even with the door open. See how far a generator should be from your house.
- Install battery-powered carbon monoxide alarms on every level of the home.
- Never plug a generator into a wall outlet. See how to connect a generator to your house.
Frequently asked questions
Can a 10000-watt generator run central AC?
Yes. A 24,000 BTU unit (3,800 running, 4,950 starting) fits easily, and a 40,000 BTU unit (6,000 and 7,800) fits with careful load management.
Can a 10000-watt generator run an electric dryer?
Yes, if you take turns. A dryer is 5,750 running watts, so avoid running it with the AC.
Can a 10000-watt generator run a whole house?
A medium home with gas appliances, mostly. Large or all-electric homes need more.
What transfer switch do I need?
Size it from the generator's amps, see the transfer switch calculator.
How much fuel does it use?
More than smaller units. See fuel consumption.
Related calculators
Sources: Appliance and tool running and starting watts from the Honda generator wattage guide, space heater watts from Lasko, and typical generator ratings from manufacturer guides. The 80% running-load rule and the assumed starting capacity are our planning assumptions, so confirm the ratings on your own generator.