What size Generator do you need for house

What size Generator do you need for the House

Size of Generator really important. As Generators can save lives during voltage fluctuation or load shedding. When purchasing a generator, the first and most crucial step is determining the Generator's size.

This article will explain how to calculate the size of your Generator and provide examples. I will explain the steps will help you determine the size of your Generator.

Why Home Generator

Why Home Generator

Your home generator can provide power and electricity in areas where electric service is unavailable.

Sometimes, homes not connected to the grid can experience power outages that can cause long-lasting and frustrating problems.

Your home generator is your source of electricity. It can turn on automatically and start powering your home in seconds after a blackout.

A generator is an essential item that you can have in your home. A home generator can keep your house running even when you lose power. At the same time its important to make sure generators exhaust extended properly.

A home generator may be a good investment if your area experiences frequent outages. You will be able to continue your daily life even if the grid is down or the lights go out if you have a backup plan.

Nothing is worse than a power cut when trying to work remotely or binge-watch your favorite TV shows.

Power losses can stop you in your tracks and slow you down. A generator will ensure that you never again have to worry about blackouts or power outages.

Generator : Styles & Sizes

There are three types of generators. They are each designed for different purposes.

  • For small purposes, you can buy portable generators.  These generators are very affordable and can be used for camping and travel.
  • Inverter generators are also quieter and more efficient than traditional generators.
  • A whole-house generator (single-phase or three-phase generators) is best used as an emergency backup to keep your home powered up and running. It is the best option if you live in an area with power interruptions, storms, or blackouts.

You can measure a Generator according to its output, not its physical dimensions. Also, you can measure generators according to their electrical power output in watts or Kilowatts.

And It is important to select the correct size generator to fit your home. A generator that is too large will be more expensive to run and produce less electricity. A generator with a small capacity can overheat, overload, or fry household appliances.

Basics of Running Watts and Starting Watts

You may use the terms starting power and running watts to describe the Generator's performance.

The starting watts are the required wattage to get the device to turn on. To get a lawnmower running it takes a lot of starting watts.

This process can cause a short surge of power. 

Other terms, such as surge Watts or peak Watts, are also used. The power rise usually lasts two to three seconds.

Watts indicates the power required to run the device during operation or the maximum capacity provided continuously.

List of Steps

step 1

Identify the appliances you wish to power with your Generator.

You can list the appliances you would like to be powered by your Generator during load shedding. You can add any devices you need to run 24/7, such as your refrigerator, lights, and security system.

step 2

Calculating the Wattage.

The second and most crucial step is determining the wattage of all the appliances you have chosen in step 1. 

There are different types of generators. And this calculation requires you to take into account two types of wattage. The first is the starting Wattage - It is the electrical power that a machine or appliance needs to turn on. 

The second calculation is the running wattage. 

It is the power your device requires to run continuously without fluctuations.

The running wattage of appliances such as washing machines and cooling/heating units is lower than their starting wattage. And it's because they require more power to start up. 

Your appliance requires less energy once they are running. 

You can usually find the appliance's wattage in the brochure or user guide with the application. You can search for the information on your device or use this wattage guide to get an estimate.

step 3

Use the calculated Wattage for the Generator.

It is always a good idea to check your calculations after completing them. You can check the details of the Generator you plan to purchase or call customer service to verify your calculations. 

Be aware that you can buy more powerful generators than your calculations require. There are a few benefits to doing this. 

First, your Generator won't heat up during work as it won't overwork itself.

Your appliances will also have a complete power supply, which will perform well. It will ensure that your Generator lasts long and keeps your devices safe.

 A more powerful generator than your appliances' total starting wattage would be a good choice. A generator with more power than your appliances is preferable to ensure that you have enough capacity to accommodate other devices over the long term.

The right size Generator

Most houses can run essential appliances like a refrigerator, freezer, or light fixture on a 5,000- to 7,500-watt Generator.

Their electrical output determines the size of generators. They are measured in watts and kilowatts.

Three simple steps are required to determine the correct size generator for your home. These include weighing how much power you need and how big you want it to be.

Appliance Wattage

It would be best to consider what appliances will be using the Generator when deciding on the size generator.

Take a list of the appliances you need to run. Add up the wattage and any start watts. These numbers will give you the generator size you require.


If you intend to move the Generator around, the size and weight of the Generator will be necessary. Generators that are heavy may not be easy to carry.

Modern generators are easier to transport and move around thanks to their wheels and handles.

A stationary generator is too heavy to be transported, while a portable generator can easily be moved.

Running Time

It's important to factor in the size and wattage of the Generator. Also, consider the running time. This is how long the Generator will run between charges.

A generator with long battery life is a good option if power outages are frequent.

A more powerful generator is recommended if you live near power outages. This Generator can power the entire house and prevent load shedding.

Calculating Wattage Needs

It is easy to calculate how much wattage you need using simple math:

Watts = Volts (voltage) * Amps(current).

And you can use this formula to calculate watts usage. 

Voltage refers to the electrical potential of an energy source, and amps are the flow of electricity at a rate similar to water passing through a hose.

Common Household Appliance Wattage

Refrigerators, lights circuits, and running water are some of the most popular household appliances that can be left running in an outage.

Each household will have its own priorities and what is most important.

The need for a generator varies depending on the appliances that they use during an outage.

People who have a lot of frozen food may place a high priority on keeping their freezers running. This may require a more robust generator to run the starting and running wattage.

Common Questions on finding a Generator to power your home.

What wattage do I need for my house to run?

Essential items in a home will consume between 5000 and 7500 watts of power. What is the difference between starting watts and running watts? The continuous watts required to keep things running are called running or rated.

Can a generator of 3000 watts run my house?

A 3000-watt generator can power almost all household appliances, including a refrigerator, washing machine, TV, water heater, and television. However, it cannot run all of them at once. A 3000-watt generator can run any number of appliances, provided that the combined wattage is not greater than 3000.

What is the cost of running central air from a 7500-watt generator?

A 7500-watt generator is ideal for homeowners. A 7500-watt generator can power most household appliances, including refrigerators, hot water heaters, freezers, light bulbs, and ovens, depending on which units you have.

Is a generator of 10000 watts enough to power a house?

Generators that are heavy-duty for use at home or on construction sites can produce more than 10,000 watts. This power supply is sufficient to power both the most essential household appliances and more demanding electric tools.

Can a 22kW generator power my house?

A 22kW generator is the best choice for homeowners who want a complete whole-house backup. The 27-36kW range is ideal for most homes as they replace 75% of the 200 amps that enter your electrical panel.

How many 100-watt solar panels are required to run a house?

The amount of electricity you wish to generate and the space available for installation will determine how many solar panels you need. A typical single-family home will have around 20 panels.

What is the power required to run a TV?

Modern TVs use less than 250 watts. This saves you a few dollars per month for even the most committed couch potato.

What are the best ways to hook up a 3000-watt generator?

A generator of 3,000 watts can power a wide range of appliances in your home, including heavy-duty appliances such as refrigerators, electric furnaces, microwaves, and televisions.

What size generator is required for a 200-amp service?

Use a 15-20 kW GenSet if your 200 Amp service panel has air conditioning. Use a 30-50kW GenSet for a 400 Amp service panel. If you have large loads or air conditioning, the larger size will work.

What is the power consumption of Central AC?

Central AC units use approximately 3,500 W electricity per hour or 12,000 Btus per hour.

Can my central AC be run with a generator?

A portable generator can power your Central AC unit. YES. You will need a portable generator with higher wattage (10000 watts) to run your AC units. A quiet generator of 2,000 watts is not enough to run most central AC units.

What can you plug into your Generator?

Plugging appliances directly into the Generator will allow you to safely use them. The Generator can be used to power your refrigerator, power tools, and computers, for example, by connecting long extension cords.


The best way to ensure your Generator lasts as long as possible is to keep it dry and dust-free.

No matter whether you decide to purchase a portable or stationary generator, your investment will be well worth it if you can keep your home and food safety in an emergency.

You can have years of powering success by making sure that you have the right Generator for your needs.

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