What Size of Generator Do I Need for the Whole House?

**Articles may contain links that I earn compensation for if clicked and you make a purchase. As an Amazon Associate, I earn from qualifying purchases. These earnings do not actually impact the price of the product or service.

What Size of Generator Do I Need for the Whole House

One of the quite common queries that come in the heads of the people before purchasing a generator is how big a generator they require? What size of generator is going to be enough for the running of heavy appliances such as freezers, refrigerators, and more? And if they can power up the whole house using that generator, what number of watts will be required to power the air compressor?

If you want a generator to power your home, you must have enough wattage to run many home machines.

How to Measure What Size of Generator Will Be Best for Your Requirements?

The most major figure is the power production of the generator.

We calculate the power in watts (W).

Although minor camping generators offer power approximately 1000 to 3000 watts.

Whereas heavy generators that are normally used for home and construction sites provide greater than 10,000 watts. This power is generally sufficient to power the heaviest household machines and demand electric devices.

Now you have to evaluate your energy requirements and figure out what amount of total wattage you should have.

Step 1# Create a List of Machines You Want to Power

In case you require a generator for your house, you must create a list of critical machines you need to run throughout an emergency power blackout.

However, freezer, lighting circuits, AC, and refrigerator are some things you must not forget to add to the list.

Step 2# Utilize the Calculator to Measure the Complete Power Needs for Your Chosen Appliances

There are 2 figures that you have to look into.

Starting Watts

This is the quantity of power the machines require to start up. Devices with motors normally need added wattage to boost off. The window air conditioner is one of the best examples.

Running Watts (Also Known as Rated Watts)

This means what quantity of energy is required by the appliances to run once they are started.

Let us give you better examples; a normal 10,000 air conditioner requires 2200 beginning watts. This is what it needs to boost up for some seconds. After that, the air conditioner demands less power. Then the AC requires a continuous resource of approx. 1500 running wattage to function.

While selecting a generator, you have to pay thoughtfulness to both figures. In the overhead case, an inverter generator with 2200 beginning watts plus 1800 running watts like Honda EU2200i possibly runs the 10,000 BTU AC.

Although you possibly cannot utilize a generator with 2000 beginning watts plus 1600 running watts to run it, no matter whether it copes with the running wattage needs because the initial wattage offered by a generator is not sufficient in the condition.

Step 3# Go For a Generator Considerably Bigger Than Your Requirements

It is better to purchase a generator, providing some additional wattage for a few ins and outs.

  • First, go for a generator that can give you additional watts so in times of emergency you can rely on it without any worries and don’t end up with a sudden power shortage.
  • The second reason is that running a generator to its full capacity can shorten its lifespan.
  • Last but not least, a generator functioning at a 100 percent load makes a lot of noise. This can make you irritated, particularly if you plan to utilize it for an RV or camping.

This is why if you measure that your power needs complete 1600 running watts, so grab a generator that can offer 1800 rated wattage. If the complete running wattage of your chosen machines is 6800 plus starting wattage is 8200, then choose a generator with 7500 rated plus starting watts approx. 9500.

How Larger Generator Do I Require to Power the Whole House?

You can power the most major home appliance with a generator rated at approx. 5000-7500 watts. This takes account of items such as refrigerator, freezer, well pump, and lighting circuits. A generator with near 7500 running watts can power all these machines at a time.

A generator with approx. 3000 to 4000 watts would be perfect for RV.

To avoid any risk, that would be great if you manually check the actual wattage of your home machines.

Those are normally mentioned on their tags and communicated either in amps or watts. Keep on reading to know the difference and how to measure these.

These will assist you in deciding what size generator you require.

The data in the calculators are the typical guess and can be utilized to attain a better idea about your power needs. Although every home and the electric appliance is different, your requirements will differ.

There is one query you must ask yourself before purchasing a generator.

Do I Want a Generator to Power the Whole House or Just the Essential Appliances?

Do you reside in an area where power crises are not unusual? If the answer is yes, then grabbing a bigger generator is better, no matter if it is a bit costly because it would give you great satisfaction, and it could result in an excellent long-term deal.

An air conditioner, refrigerator, lights, freezer, TVs and pressure pumps are some of the machines you may desire to run while suffering power outages.

You do not require a costly heavy-duty moveable generator to power these.

Can I Utilize a Big Portable Generator to Run Sensitive Appliances?

To be precise, yes, you can utilize portable generators, but we will not suggest it.

That is due to conventional heavy-duty generators normally undergo from greater Total Harmonic Distortion (THD). The shared accord is that 3 percent THD is the concentrated starting point for the power to be categorized as clean and totally safe for current electronics. Home standby generators, as well as state electric grid, function well under this threshold. But unluckily, we cannot assume a similar thing about most usual heavy-duty transportable generators.

%E2%80%8EFirman P03608 Portable Generator

Utilizing them to run your flatscreen TVs, laptops, or other power-sensitive electronics devices for constant long hours can destroy them.

Although the worthy update for you is moveable inverter generators do not undergo similar trouble and can be securely utilized to function sensitive computer electronics.

However, frequent inverters are pretty small, so one cannot rely on a solo inverter generator to power the whole house.

Although maximum generators are available with a similar capability, you can utilize two inverter generators in similar which will ultimately double your complete power production.

For instance, if you take two Hondas EU3000iS inverter generators and utilize them simultaneously to generate dual power, you will be getting approx. 5600 running watts. This is quite sufficient to run a few large necessary machines in times of emergency. You may possibly also safely power sensitive electronic device.

in case you determine to utilize a portable generator in any condition, whether it is an invertor or normal generator; never activate one in the absence of a transfer switch.


We have added enough information to give you an idea of what size generator for the whole house will work for you. Above are given the steps as well that you can calculate the watts you require to power the home and buy accordingly.