What Size Generator Do I Need for a Construction Site?

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You might be an employee of a construction company or a contractor. You’ll be in need of a generator. In construction, tremendous appliances need to be powered, and establishing an electric system on a construction site is a lot more complicated than simply using a generator.

What Size Generator Do I Need for a Construction Site

Now that you’re finding a generator, a question teems at you: what size generator do I need for a construction site? It is obvious that you must supply power to construction equipment, so it becomes complicated.

When it comes to generators, there are a variety of sizes available on the market, but the question of what size generator for a construction site can be overwhelming.

We are here to help you select the right generator for your construction site, so don’t worry about that. Come on, let’s get started.

Why it’s Important to Choose the Right Size?

There may seem to be no easier way to find out if a generator is right for you than to buy it and start using it. If you do your research and determine what size generator you will need before you purchase one, you’ll avoid a lot of problems later on. 

Using the right size generator, for instance, will ensure it runs smoothly and last longer. As a result, system failures or shutdowns will be less likely to occur. Choosing the right generator for your job will also make you and your team much safer.

Things Need To Consider Before Choosing The Generator For Your Construction Site

These factors should be considered before choosing a generator for your construction site. I am sure your efforts won’t go to waste.

1. Wattage Requirement 

The first step to figuring out what size generator you need for the construction site is to calculate how many watts are needed.

1.1 Medium Generators 

If there is a medium generator, then medium generators can power from 3,000 to 5,000 watts.

1.2 Large Generators

If there is a medium generator, then large generators can power between 6,000 to 9,000 watts.

1.3 Extra-Large Generators 

If there is a medium generator, then extra-large generators can power from 10,000 to 15,000 watts. 

When you add up the watts of all the things you’ll be plugging into the generator, based on the total wattage, your generator’s size will become clear.

The wattage required to start some tools is greater than the wattage needed to run them. You should check how many watts it takes to start a tool as well when checking the watts necessary to run the tool.

In order to ensure your generator has enough power, you should also add 10 percent to your final total.

2. Size of the Generator

Generators are available in a variety of sizes, including Medium generators, Large generators, Extra-Large generators, and industrial generators. Wattage varies among generators. 

2.1 Medium Generator

The size of your generator can be determined once you know how much wattage you will need. 

A medium generator can produce between 3,000 and 5,000 watts – although this may seem like a small amount, it can power a little bit of equipment. Most people choose this type of generator if they want to keep one close at hand in case of an emergency, as it can typically power a refrigerator and a furnace fan, among other things. This might be a good option for you if you need a backup generator for a job.

2.2 Large Generator

6,000 to 9,000 watts is how much power large generators can deliver. 

Several different rooms in a home can be powered by large generators, so they are popular with people. This may be a good option for construction sites that utilize a lot of power tools. It’s recommended that you get a large generator if you know that you will use 6,000 watts or more to make sure that all of your appliances and tools work together.

2.3 Extra-Large Generator

Extra-large generators can produce over 10,000 watts of power at once. In a home, appliances such as an air conditioner and a refrigerator, as well as electric pumps could all be operated by it. 

A big generator would be perfect if you’re going to be using energy-consuming tools on the job. It may be wise to go with a larger size if you aren’t sure how many watts you will need, so you know your project will be powerful enough.

2.4 Industrial Generator

Getting an industrial-sized generator may be a good idea if your tools need a lot of power or if they must be running 24/7. The majority of these are designed to keep large companies and companies running during a power outage, giving you plenty of power for your business.

Other Factors Should Also Be Ponder Size of the Site

Your generator will need to produce more power the larger your construction site is. The bigger a construction site is, the more generators it may require.

1. Types of Equipment

When you’re working with heavy tools and equipment, a generator with a higher wattage is better than one with a lower wattage.

2. Reserve Power 

When a piece of equipment is turned on, it uses more electricity than when it is running. When starting multiple machines or tools at the same time, ensure your generator can handle power surges.

3. Phase 

The generators are available in single and three-phase configurations. The latter version is more likely to be needed in a construction project since it delivers a more reliable and stable power supply.



Generators are essential on construction sites so that appliances and tools can be operated. The size of the generator depends on a variety of factors, so choosing one can be challenging. By following the above tips, however, you will be able to pick the correct generator size that will help you accomplish your task quickly and effectively.

Now that you have your answer, I hope your question about what size generator do I need for a construction site has diminished.

It's Carl Denis here, and I'm glad you found my site. As a generator enthusiast, I write on MyGeneratorLab. In spite of our trusty RV being used virtually every day on worksites, my wife and I go on road trips every weekend with our family in it. As part of my mission, I aim to provide information that will assist you in choosing the right generator.

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