What will a 7,500 watt generator run?
A 7,500 watt generator runs a refrigerator, a chest freezer, lights, wifi and phone chargers, a gas furnace fan, a 1 HP well pump, a sump pump, a microwave, a coffee maker, and most window air conditioners at the same time. It will also handle a 1.5 ton central AC.
It will not start a 2 ton or larger central AC, and it can't take an electric clothes dryer at the same time as the rest.
Why is 7,500 watts not the number that matters?
Here is the part most generator pages skip. On a portable generator, the big number on the box is usually the peak (starting) wattage. The continuous rating is lower.
A generator sold as 7,500 watts typically runs about 6,000 watts continuously. That 6,000 is the figure that limits what you can power at once, because it's what the unit can sustain all day rather than for a second or two.
This page uses 6,000 running watts and 7,500 peak watts, which is what a 7,500-watt portable actually is. If you're looking at a standby generator rated 7,500 running watts, you have more room than everything below suggests.
Check the nameplate on the unit you own or plan to buy. The running rating is sometimes printed as "rated watts" or "continuous watts."
What will it run, appliance by appliance?
Each row assumes you're already powering the basics: a full-size refrigerator, a chest freezer, 20 LED bulbs, wifi, and phone chargers. That baseline draws 720 running watts and peaks at 1,620 watts, mostly from the refrigerator compressor kicking on.
The last column shows how much running capacity is left after adding that appliance. A positive number means it fits.
| Appliance addedAppliance | DrawsWatts | Total runningTotal | Room leftSpare |
|---|---|---|---|
| Heating and cooling | |||
| Furnace Fan (gas) | 650W | 1,370W | +4,630W |
| Ceiling Fan | 50W | 770W | +5,230W |
| Whole-House Fan | 400W | 1,120W | +4,880W |
| Electric Space Heater | 1,500W | 2,220W | +3,780W |
| Window A/C (5,000 BTU) | 500W | 1,220W | +4,780W |
| Window A/C (10,000 BTU) | 900W | 1,620W | +4,380W |
| Window A/C (14,000 BTU) | 1,400W | 2,120W | +3,880W |
| Central A/C (1.5 ton) | 1,800W | 2,520W | +3,480W |
| Pumps and water | |||
| Well Pump (½ HP) | 900W | 1,620W | +4,380W |
| Well Pump (1 HP) | 2,000W | 2,720W | +3,280W |
| Sump Pump (½ HP) | 800W | 1,520W | +4,480W |
| Sump Pump (1 HP) | 1,500W | 2,220W | +3,780W |
| Sewer Ejector Pump | 800W | 1,520W | +4,480W |
| Electric Water Heater (40 gal) | 4,750W | 5,470W | +530W |
| Kitchen | |||
| Microwave (1,000W) | 1,250W | 1,970W | +4,030W |
| Coffee Maker | 900W | 1,620W | +4,380W |
| Toaster | 1,250W | 1,970W | +4,030W |
| Electric Kettle | 1,350W | 2,070W | +3,930W |
| Slow Cooker / Instant Pot | 500W | 1,220W | +4,780W |
| Dishwasher | 1,500W | 2,220W | +3,780W |
| Blender | 550W | 1,270W | +4,730W |
| Laundry | |||
| Washing Machine | 750W | 1,470W | +4,530W |
| Gas Clothes Dryer | 500W | 1,220W | +4,780W |
| Electronics | |||
| Smart TV (50") | 110W | 830W | +5,170W |
| Laptop Computer | 70W | 790W | +5,210W |
| Desktop Computer + Monitor | 275W | 995W | +5,005W |
| Cable DVR / Set-Top Box | 30W | 750W | +5,250W |
| Tools and workshop | |||
| Electric Drill | 600W | 1,320W | +4,680W |
| Shop Vacuum | 975W | 1,695W | +4,305W |
| Air Compressor (1 HP) | 1,000W | 1,720W | +4,280W |
| Circular Saw (7¼") | 1,400W | 2,120W | +3,880W |
| Table Saw (10") | 1,800W | 2,520W | +3,480W |
| Medical and other | |||
| CPAP Machine | 45W | 765W | +5,235W |
| Oxygen Concentrator | 300W | 1,020W | +4,980W |
| Garage Door Opener (½ HP) | 350W | 1,070W | +4,930W |
Every figure is the appliance's own running watts plus the 720W baseline. None of these rows account for the appliance's startup surge, which the next section covers.
What won't a 7,500 watt generator run?
Four things on a typical house fail against a 7,500-watt portable. Three of them are surprising, because the running watts look fine.
| ApplianceItem | DrawsWatts | Why it doesn't fitWhy not |
|---|---|---|
| Heat Pump (2 ton) | 2,200W | Running watts are fine at 2,920W, but the startup surge reaches 7,920W and the peak limit is 7,500W. |
| Central A/C (2 ton) | 2,800W | Running watts are fine at 3,520W, but its startup surge reaches 8,720W and the peak limit is 7,500W. |
| Central A/C (3 ton) | 3,800W | Running watts are fine at 4,520W, but its startup surge reaches 10,520W and the peak limit is 7,500W. |
| Electric Clothes Dryer | 5,500W | Needs 6,220W running. That alone is over the 6,000W running limit. |
The three air conditioning rows are the interesting ones. If you only added up running watts, a 2 ton AC looks like it fits with room to spare. It doesn't, because the compressor motor pulls a large spike for a second or two when it starts.
If you need to run a 2 ton or larger central AC, the practical options are a bigger generator, a soft-start kit on the AC unit (which lowers the startup spike), or a professionally installed standby generator sized for the whole house.
How is this calculated?
Two rules decide everything on this page:
- Total running watts must stay under the generator's continuous rating (6,000W here).
- Total running watts plus the single largest surge must stay under the peak rating (7,500W here).
For the second rule you add only the largest surge, not every surge, because appliances rarely start at the same instant. So a house running 2,720 watts with a 1 HP well pump peaks at 5,720 watts, which fits inside 7,500.
Working the numbers this way is what catches the air conditioning rows above. We add a 20% margin on top when recommending a size.
Appliance wattages are typical values for common residential models. Your specific appliance may differ. The nameplate on the appliance itself is always the better number.
Add up your own appliances
Pick what you want to power and get your exact size, with the math shown.
Open the Generator Size Calculator →Frequently asked questions
Will a 7,500 watt generator run a refrigerator?
Yes, easily. A full-size refrigerator draws about 300 running watts and needs roughly 1,200 watts to start. That leaves plenty of room for the rest of the house.
Will it run central air conditioning?
It depends on the tonnage. A 1.5 ton central AC draws about 1,800 running watts and surges to roughly 5,400, so it fits. At 2 tons the surge reaches about 8,000 watts and no longer fits.
Will it run a well pump?
Yes. A ½ HP well pump draws about 900 running watts and surges to about 2,500. A 1 HP pump draws about 2,000 and surges to about 5,000. Both fit alongside refrigeration, lights, and wifi.
Can it run my whole house?
Most of it, but not all of it at once if your home has central air, an electric water heater, an electric dryer, or an electric range. Those large heating loads need to be rotated, or left off.
Is 7,500 watts running watts or peak watts?
On a portable, it's usually peak. Expect roughly 6,000 running watts. Check the nameplate, because the running rating is the number that limits you.
Related
- Generator size calculator (add up your own appliances)
- Appliance wattage chart (running and starting watts)
- Portable vs standby generator (which type fits your situation)
- What size generator for a well pump? (1/2 HP and 1 HP, plus the 240 volt catch)
- What size generator for a sump pump? (1/2 HP and 1 HP, and why storms are the worst case)
- What size generator for a fridge and freezer? (plus how long food stays safe)
- Fuel and runtime estimator (how long it runs on a tank)
Last reviewed September 2026. Appliance wattages are typical residential values and may differ from your specific models.