What Size Generator To Run A 3000 Sq Ft House?

You’ve decided to make the investment in security which only backup generators will provide. It’s a fantastic choice.

You’ll be able to sleep peacefully knowing that you’ve done all you can to ensure your business or home is secure in the event of a power failure.

Now, the most important issue is –

What size generator to run a 3000 sq ft house? Most likely, you’ll require a 25 kW to 30 kW Residential Generator or a bigger Commercial Generator to run a 3000-plus sq. ft. house.

But, the process of determining the right size for a home generator can be a little more complicated than you imagine.

It’s based upon the dimensions of your house Of course however, it is also dependent on the appliances you’d like access to if the power is cut off to the utility.

You don’t have to fret about how to measure a house generator for a long time. We’re here to assist you.

A power failure is more frightening during floods and cyclones because power isn’t available for a long time. In such instances, it is possible to have a generator that can be life-saving for your home. But getting a generator to your home isn’t an easy task.

The first thing to note is that homes are typically 3000 square feet. Hence, you must keep that dimensions in mind.

Then, we’ll present to you the 4 best generators for 3000 square feet of homes. Generators can be extremely expensive.

We have therefore carefully chosen the generators that anyone can afford.

We have also confirmed that these units produce at least 10000W of power that is sufficient for running ovens, refrigerators, ACs, and lights in three thousand square feet of space.

The Best Generator For 3000 Sq. Ft Home Reviews

A home generator isn’t an essential component at first. However, it can provide a lifesaver in the event of power interruptions. Additionally, in the USA most burglaries occur when there is a power failure. You can deter thieves and have uninterrupted power with reliable and inexpensive generators.

What size generator to run a 3000 sq ft house? Here, we will show you the best home generators for your whole house after analyzing 20+ models.

1. DuroMax XP12000EH Generator

DuroMax XP12000EH Generator-12000 Watt Gas or Propane Powered Home Back Up & RV Ready, 50 State Approved Dual Fuel Electric Start Portable Generator, Black and Blue
  • With 12,000 watts of power, the XP12000EH Dual Fuel generator will keep your...
  • DuroMax is the industry leader in Dual Fuel portable generator technology, with...
  • At the core of all our products resides a robust DuroMax engine. Designed for...
  • The XP12000EH comes equipped with a wide variety of outlets, including a...
  • Constructed with a heavy-duty all metal frame and power panel - No plastic parts

Last update on 2024-06-05 / Affiliate links / Images from Amazon Product Advertising API

Whatever number of lights and fans, air conditioners, and refrigerators you have in your home No matter how many appliances, lights, air conditioners, or refrigerators you have at home, DuroMax generator is ready to handle the burden.

The generator that has 12000W of power at the start and 9500W of capacity is able to run the entire home.

Another reason that led us to select the DuroMax generator instead of the other is its dual-fuel operating capacity. Yes, it is possible to run the device using gasoline or propane. Dual-fuel capability offers the flexibility to choose a fuel that is affordable. Additionally, it helps you save cash on gas.

It also has an auto-shutting-off function. It will shut down whenever it detects fuel levels are low. This safeguards the device from harm caused by running low on fuel. Aren’t you amazed? It’s not the only thing.

It is possible to run the device with 240V and 120V volts simultaneously. We recommend that you run the machine in 120V receptacles for full power capability.

The machine is built with an OHV4-stroke 457CC engine. It can last from 7-10 years at a time.

In the end With CARB as well as EPA acceptance for all 50 states across America You don’t have to be concerned about permission from users.

The metal construction is sturdy and durable, with corrosion-proof paint. It also offers simple maneuverability thanks to two wheels large enough and the handle.

Highlighted Features:

Dual-fuel technology

CARB as well as EPA approved

Pros & Cons


  • Auto-shutoff prevents machine damage
  • Weatherproof construction of metal
  • Large wheels and handles for transportability
  • Large 8.3-gallon tank to run for long hours


  • The generator is difficult to maintain.
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2. A-iPower SUA12000E 12000 Watt Generator

A-iPower SUA12000E 12000 Watt Portable Generator Heavy Duty Gas Powered With Electric Start For Jobsite, RV, and Whole House Backup Emergency
  • The A-iPower SUA12000 produces 12,000 starting watts with 9,000 running watts to...
  • Powerful 459 cc OHV 4 stroke engine with a low oil alert light and low oil...
  • Large 7 gallon gasoline fuel tank provides average run time of 7 hours at 100%...
  • Complete with Electric Start capability allowing you to quickly, easily, and...
  • Outlets include: 2x5-20R Duplex GFCI (20A, 120V), 1xL14-30R (30A, 120/240V),...

Last update on 2024-06-05 / Affiliate links / Images from Amazon Product Advertising API

We have included this A-i Power generator because of two major reasons. It has a maximum power of 12000W in its starting capacity. Secondly, it has seven hours of backup time at the very least. The generator is indeed 12000W of power at the start. According to the specs, it provides 9000W of power.

It is able to run several lights, air conditioners, and fans. Additionally, you can use the device to run a refrigerator device. This will be sufficient for you to live your life without power.

In addition, the machine is equipped with a fuel tank that is 7 gallons in size. It’s enough to operate the machine at full capacity for seven hours.

In addition, extending the running duration to 9 hours is feasible by keeping the power at 50% capacity.

So, you don’t need to worry about your fuel being depleted before power restoration. But, you can run it using only gasoline. It would be great to operate the machine using propane or gasoline, similar to our DuroMax generator.

The generator also runs using a 459cc OHV four-stroke motor. It’s a motor that’s powerful enough capable of handling the entire load for a long time.

It has shut off for low oil. It also protects the machine from being damaged. It even has a signal to notify you that the oil level is low. This allows you to fill up the tank with fuel.

Short story, the generator that has a 12000W start load and seven hours of backup power is the ideal choice for homes of all sizes. Its rubber-coated outlets are also a guarantee of the best security features.

Highlighted Features:

  • 7plus minutes of backup
  • 9500W of capacity to load
  • A powerful 4-stroke engine with 459CC power.
  • Alarm for low oil and shutting down the facility

Pros & Cons


  • It can easily run for more than 7 hours.
  • All outlets have rubber wrap for security
  • Large wheels to make it easy to maneuver
  • Usable in homes, construction sites, industries, etc.


  • It only runs on gasoline
  • Some people complained about the loudness
Buy on Amazon

3. Westinghouse WGen9500DF Dual Fuel Home Generator

Westinghouse 12500 Watt Dual Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas and Propane Powered
  • 9500 Running Watts and 12500 Peak Watts (Gasoline); 8500 Running Watts, 11200...
  • Features Two GFCI 120V 5–20R Standard Household Receptacle, One Transfer...
  • Powered by a Heavy Duty 457cc Westinghouse 4-Stroke OHV Engine Featuring a...
  • Plug-and-Play: Comes With a Remote Start Key Fob, 12V Battery Charger, Oil, an...
  • All Westinghouse Portable Generators are Functionally Tested in the Factory and...

Last update on 2024-06-05 / Affiliate links / Images from Amazon Product Advertising API

With a run time of 12 hours time, The WGen 9500DF generator is a great backup in the event of power failures. It’s extremely useful in times of emergency, such as flooding or cyclones. You can rest at home, with 12 hours of battery life, and be assured that it won’t run out of fuel until the authority can restore the power.

Furthermore, the machine produces 12000W at peak load. The power of the running system is 8500W. This is a bit lower than the two previous generators we have included. But, the ability to run several lights, fans, air conditioners, and fans is sufficient.

Following, its VFT display will provide live updates on the generator. It will show the lifetime hours, the voltage output, and the frequency. This way, you’ll know what’s going on and the amount of fuel remaining in its tank.

There’s even an option to shut off the fuel when it is low. If the generator detects low fuel levels, it shuts down immediately.

Additionally, the device comes with everything in the package to ensure a safe running time. The device has both recoils as well an electric start.

Its key Fob is ideal for remote starting. It lets you start the device without having to be near it. Additionally, it supports plug and play feature.

Additionally, the 457CC 4-stroke engine comes with EPA as well as CARB approval. It permits you to operate the generator at home, without any prior authorization.

Additionally, the generator operates with a minimal amount of noise. This means that your neighbors won’t have any reason to believe that the machine isn’t in being in compliance.

The common GFCI outlets and receptacles have a cover made of rubber for top security features.

Highlighted Features:

  • Dual-fuel technology for running
  • VFT display to show real-time updates
  • Remote-controlled electric start
  • 12000W of peak capacity for load

Pros & Cons


  • It can easily run for 12 hours or longer with the 6.6-gallon fuel tank
  • The plug-and-play feature is quick and easy to use that includes everything included in the package
  • The powerful 4-stroke engine is quieter than other generators of its kind.
  • Fast portability, thanks to the large wheels and die-cast frames


  • The generator is somewhat expensive
Buy on Amazon

4. Champion Power Equipment 100111 15,000/12,000-Watt Portable Generator

Champion Power Equipment 100111 15,000/12,000-Watt Portable Generator with Electric Start and Lift Hook
  • Ultra-Powerful – At 15,000 starting watts and 12,000 running watts, enjoy up...
  • Electric Start – Trust the reliable 717cc V-Twin Champion engine with its...
  • Covered Outlets – One 120V 30A locking, a 120/240V 30A locking, a 120/240V 50A...
  • Lift Hook – Designed for safe and easy transport, loading and unloading, plus...
  • Champion Support – includes 3-year limited warranty with FREE lifetime...

Last update on 2024-06-05 / Affiliate links / Images from Amazon Product Advertising API

When we first looked at the Champion Power Equipment generator, it immediately impressed us with its capacity to load 15000W at the beginning.

The champion generator comes with 15000W of starting load, with 12000W of power delivery. Therefore, it has the most power-efficient delivery, which makes it the most efficient generator for 3000 square. feet homes.

And, on top of that, 10.9 gallons of fuel-tank capacity is amazing. It is able to run over 9 hours. It’s enough power to power multiple appliances for a prolonged period of time.

The generator has an incredible amount of power and runs for a long time thanks to the 717CC OHV motor. Additionally, it runs at lower than 78 decibels. This is less than the typical noise pollution limit. This means that you are less likely to experience a nuisance.

However, we suggest placing the generator at least 20 feet away from rooms to ensure quiet usage. Also, you will appreciate its GFCI outlet and receptacles equipped with integrated Volt Guard.

It is paired with the surge protector in order to shield the device from issues with voltage. It also makes maintaining the generator simple.

Additionally, you can operate the generator with 120V or 240V power. This means that you don’t need to be concerned about the voltage input to your appliances in your home.

The device also comes with cold-start technology. It allows you to run the generator easily even on cold winter days.

This is an excellent benefit because many generators can have a difficult time beginning in the winter months.

Highlighted Features:

  • 15000W of load capacity at the start
  • Over 9 hours of backup facilities
  • It is available in 120V and 240V voltages.
  • Operates at less than 78dB sound level

Pros & Cons


  • Electricity and cold-starting for simple procedures
  • Large 717CC OHV motor for powering multiple devices
  • Three years of warranty against any defect
  • Volta Guard and surge protectors protect the generator


  • At 350 pounds, it’s somewhat difficult to move
Buy on Amazon

What To Look For 3000 Sq. FT Home Generator?

If you are in the market for a generator to power your home, think about its power requirements and fuel tank capacity as well as the noise level and price. It is also important to think about the portability of the generator as well as safety features.

Power load capacity:

For a home with 3000 square feet, the generator requires at least a 10000W power supply. It is also known as the starting power load.

The true wattage requirement should not be lower than 8000W. This is important because an area of 3000 square feet will include many air conditioners, fan light fixtures, refrigerators and.

The generator must have sufficient power to supply the electricity needed by each of these devices. If the generator isn’t powerful, it will not be able to perform at its best.

Tank size, as well as backup time:

Then, you should think about the dimensions of the fuel tank. It must be large enough to allow enough fuel to last for at least six hours. So the fuel tank of your generator should be at least 6 gallons in capacity to hold its tank.

We have provided four top-quality generators that offer a minimum of seven hours of backup. This will give you peace of mind as you don’t have to be in the dark during fuel shortages.

Type of fuel used:

Generators are powered by gasoline or propane primarily. You must consider the type of fuel that generators use.

Today, a lot of generators can run on dual fuel. It allows you to operate these machines using gasoline or propane.

In contrast, other generators can only run using propane or gasoline. Dual-fuel running can be used in a variety of ways and is also cost-effective.

Operational noise level:

Because you’ll be using this generator within a household space, it’s crucial to consider the noise level.

If the generator produces excessive noise, it will not be peaceful for you and your family. Additionally, it could be disruptive to neighbors who could complain.

We suggest you select generators that have less than 80dB in noise. It is recommended to use noise levels that are not impacted by pollution. Therefore, it is very useful to use it at your home.


What size generator do you need to power a 3000 square foot house?

In general, you’ll need typically a 25 kW to 30 kW Residential Generator or a larger Commercial Generator for a house with 3,000+ square. ft. house.

How much is a generator for a 3000 square foot house?

Generator Size: 25 to 30 kW
Price Range: $4,500 – $12,500
Coverage Area: 3,000 – 5,000 sq ft home

How many watts does it take to run a 3000 square foot house?

The average kWh consumption for a 2,000-square-foot house is 1.325 (kWh). The average usage of kWh for a 3,000-square-foot house is 1840 kWh. The average kWh usage for a home with 4,000 square feet: 2.200 kWh.

How many amps does a 3000 square foot house use?



Do we hope that you have the answers you’ve been searching for in regards to questions such as – what size generator to run a 3000 sq ft house?

It is evident that all-home generators are not an exact fit for all – however, you’ll be more confident about your next steps from this point on.

The most efficient generator suitable for three thousand sq ft homes will run the HVAC and home appliances systems in the event of power outages.

We’ve analyzed the best generators available at reasonable prices for household use. Therefore, you can easily choose one of these four home generators and be confident. They have a long-lasting backup and simple maintenance that will keep your mind at ease.

Of course, their easy functionality, efficiency, and sturdy construction will prove useful. So, which one is your top choice?


Dibyajyoti Bordoloi (CS, MBA Finance & Accounting) is the founder of CageHeaven.com. He is a Practising Company Secretary and a real estate and stock market investor. He is the owner of CS Bordoloi and Associates. He is a commerce graduate from Darrang College, Tezpur, Assam. Later on, he pursued his higher studies at the Institute of Company Secretaries of India (ICSI), and completed his MBA (Finance) degree from Guwahati University. With over 16 years of experience in finance and accounting, he teaches personal finance to non-technical common people like you how to do it the right way. He is a proud member of the Chamber of Real Estate and Builders Association (North-East India). He is also a successful Investor and Trader in Equities and Real Estate.