Best Large Portable Generators (9,000+ Watts)

Disclosure: TheMowerReport is reader-supported. As an Amazon Associate we earn from qualifying purchases. If you buy through our links we may earn a commission at no extra cost to you.

The short answer

The best large portable generator for most homes is the Westinghouse WGen9500DF: 12,500 peak watts on gasoline, dual-fuel flexibility, remote electric start and both 30A and 50A outlets for a transfer switch. If you need more surge for a big well pump or central-air compressor, step up to the DuroMax XP13000EH. If quiet, electronics-safe power matters, the Champion 11,000-Watt Dual Fuel Inverter is the pick. Generators this size are for powering much of a house through a transfer switch or interlock, never through extension cords snaked indoors.

Not sure what size you need? Tick your appliances in our generator size calculator and get a recommended wattage in seconds.

Who needs a 9,000-watt-plus generator?

A 9,000+ watt portable makes sense if you want to run a 240V well pump, a central furnace, a refrigerator and freezer, lights, and some kitchen appliances at the same time, or if you have a smaller central AC unit you’d like to keep going in summer outages. If you only need a fridge, a few lights and phone charging, a 3,000–5,000 watt inverter is cheaper, lighter and much quieter.

Our picks at a glance

Pick	Model	Fuel	Peak watts (gas, rated)	Best for	Amazon
Best overall	Westinghouse WGen9500DF	Gas / propane	12,500	Most home-backup setups	Check price
Best with CO sensor	Westinghouse WGen9500DFc	Gas / propane	12,500	Same power with CO shutoff	Check price
Most power	DuroMax XP13000EH	Gas / propane	13,000	Big well pumps, more circuits	Check price
Best gas-only	Generac GP8000E	Gas	10,000 starting / 8,000 running	Gas-only households, CO shutoff	Check price
Best inverter	Champion 11,000-Watt Dual Fuel Inverter	Gas / propane	11,000	Quieter, cleaner power for electronics	Check price
Best value	Champion 9375-Watt Dual Fuel (CO Shield)	Gas / propane	9,375	Budget home backup	Check price

Peak (starting) watts are manufacturer figures. Running watts are lower, and every dual-fuel generator produces less on propane than on gasoline. Check the spec sheet for running watts on the fuel you’ll use.

How we picked

We compared manufacturer specifications, owner reviews and published reviews from home-backup and outdoor-power outlets. We prioritized running and peak watts, 240V outlets (a 30A L14-30 and ideally a 50A outlet), electric or remote start, dual-fuel capability, CO safety features, warranty and parts support.

1. Westinghouse WGen9500DF — Best overall

The WGen9500DF is the benchmark large portable: 12,500 peak watts on gasoline, gasoline or propane operation, and remote electric start with a key fob, so you don’t wrestle a pull cord in a storm. It has a transfer-switch-ready 30A L14-30 outlet and a 50A outlet, plus household outlets. That combination covers most home-backup plans, from a 6-circuit transfer switch to a full-panel interlock.

Who it’s for: homeowners who want to run essentials plus a well pump or furnace and a few comforts.

Good to know: it’s heavy. Wheels help on concrete, but on gravel or grass plan a permanent, level spot.

Check the Westinghouse WGen9500DF on Amazon → →

2. Westinghouse WGen9500DFc — Same generator, with CO sensor

The “c” version adds a carbon monoxide sensor that shuts the generator down if CO builds up around it. Portable generators are a leading cause of CO poisoning during outages, and CO-sensing models are an inexpensive layer of protection. Everything else matches the WGen9500DF.

Check the Westinghouse WGen9500DFc on Amazon → →

3. DuroMax XP13000EH — Most power for the money

DuroMax’s XP13000EH is rated at 13,000 peak watts on gasoline and runs on gasoline or propane. It has electric start and transfer-switch-ready outlets including a 50A, and it’s popular with owners who need extra starting surge for a large well pump or a central-air compressor.

Good to know: it is one of the loudest and heaviest options here. Place it well away from bedrooms and neighbors’ windows.

Check the DuroMax XP13000EH on Amazon → →

4. Generac GP8000E — Best gas-only

If you don’t need propane, Generac’s GP8000E delivers 10,000 starting and 8,000 running watts on gasoline from a 420cc OHV engine, and Generac’s PowerRush feature adds starting capacity for motors like a well pump or AC compressor. It has push-button electric start, COsense carbon monoxide shutoff, two 20A GFCI duplex outlets and a 30A L14-30R locking outlet for a transfer switch, and a 7.9-gallon tank rated for up to 10 hours at 50% load. It’s a good fit for gas-only households that keep fuel stored and stabilized.

Good to know: gasoline goes stale. Use a fuel stabilizer, rotate stored fuel, and run the generator monthly.

Check the Generac GP8000E on Amazon → →

5. Champion 11,000-Watt Dual Fuel Inverter — Best inverter

Inverter generators produce cleaner power that’s safer for electronics, and they throttle down at light loads, which saves fuel and reduces noise. Champion’s 11,000-watt dual-fuel inverter brings that to the large-generator class with electric start and gas or propane operation. It’s the choice if you’ll run computers, TVs and modern HVAC controls for long periods and want a quieter neighborhood presence.

Good to know: inverters cost more per watt than open-frame generators. Check the running watts and the 240V outlet configuration before you assume it’ll start a large well pump.

Check the Champion 11,000-Watt Inverter on Amazon → →

6. Champion 9375-Watt Dual Fuel with CO Shield — Best value

Champion’s 9,375-watt (peak) dual-fuel model is a lower-cost way into this class, with electric start and Champion’s CO Shield automatic shutoff. It’s a sensible choice if your loads are moderate (essentials plus a smaller well pump) and you want Champion’s widespread parts and service network.

Check the Champion 9375-Watt Dual Fuel on Amazon → →

How many watts do you need?

Load	Approx. running watts	Approx. starting watts
Refrigerator	700–800	1,500–2,200
Chest freezer	500–700	1,500–2,000
Furnace blower (1/2 HP)	800	2,300
Well pump (1 HP, 240V)	1,500–2,000	4,000–6,000
Sump pump (1/2 HP)	1,000	2,000
Central AC (3 ton)	3,000–4,000	Often 9,000+ without a soft starter
Microwave	1,000	—
Lights, TV, internet	300–600	—

These are typical ranges from generator sizing guides; your appliance labels are the real source. Add up the running watts of everything you’ll run at once, then add the single largest starting surge. Leave 20% headroom. A soft starter on a central AC or well pump can cut its surge substantially.

Safety: non-negotiable

• Outdoors only, at least 20 feet from the house, with the exhaust pointed away from doors, windows and vents. Never in a garage, even with the door open.
• CO alarms on every level of the home, and choose a CO-shutoff model when you can.
• Use a transfer switch or interlock, installed by an electrician. Backfeeding through an outlet can electrocute utility workers.
• Keep it dry under a generator tent or open-sided cover rated for running generators.
• Refuel cool: shut it off and let it cool before adding gasoline.

Buying checklist

• Running watts (not just peak) on the fuel you’ll actually use.
• A 30A L14-30 and ideally a 50A outlet for a transfer switch or interlock.
• Electric or remote start, and a battery that you keep charged.
• Dual fuel if you want propane’s long storage life.
• CO-sensing shutoff.
• Warranty length and local service availability.
• A heavy-duty 50A or 30A generator cord long enough to keep it 20 feet away.

FAQ

What size generator do I need to run my whole house?

For essentials plus a well pump and furnace, 9,000–13,000 peak watts is typical. Running central AC and electric appliances at once can require a standby generator rather than a portable.

Can a 9,500-watt generator run central air?

Often a smaller central AC unit, yes, if little else is running. Starting surge is the challenge; a soft starter on the compressor makes it much more manageable.

How long will a large portable generator run on a tank of gas?

It varies with load and tank size; many large portables are rated for roughly 8–12 hours at half load on gasoline. Check the spec sheet for your model.

Is propane or gasoline better for a backup generator?

Gasoline gives more power; propane stores for years without going stale and is cleaner for the carburetor. Dual-fuel generators let you use either.

How far should a generator be from the house?

At least 20 feet, with the exhaust pointing away from doors, windows and vents, and never in a garage or enclosed space.