How big of a generator do I need to run a house?

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Are you tired of being in the dark during the power outages or blackouts? We believe that you are probably looking to shop for a generator for your house. Well, it is a good investment that you can make for the convenience and safety of your loved ones. Having this equipment will ensure your family members don’t have to stick without power. 

However, the real query people have in mind is “how big of a generator I need to run my house”? It is a tricky question, especially for those who don’t have too much practical knowledge. There is nothing to panic if you are one of them as our team is here to help you with this perspective. Let’s read the complete post and we are pretty assured you will able to answer your query.

Steps for finding the size of generator you need

There are certain steps you need to follow to get an idea about the size of the generator. We have mentioned them in detail below:

Listing electrical equipment

The foremost thing you need to do is finding out what sort of appliances you want to use during the power outages or blackouts. Make a list about them and make sure nothing gets missed. 

Finding starting and running watt

Once you create the list, the next thing that needs to be done in calculating the starting and running wattage of each device. You can use watt estimate guide for this purchase or check out these numbers on the appliance label.

Please keep in mind that starting wattage also known with the name of surge wattage is the power an appliance requires for a start-up. It is generally at least two times higher when compared with the running wattage. 

Adding the wattage

After finding both starting and running wattage, you need to add both of them. It is the size of the generator that you need to run the house. 

It is important to understand that a DIY estimate isn’t always 100% accurate. However, it helps in deciding the size of a generator. If you want to be on the safer side, then taking the help of a professional electrician will be a good idea. Also, go for a generator that is slightly bigger in size in terms of total wattage your home needs to run.

For instance, the total power needs to run all the appliances in the house are 32,400 watts. In that case, we will suggest you go for a 35KW generator as there are chances of missing certain things while making a list. So, it is ideal to be a smart buyer.


So, what is the size of the generator that you need to run the house? We believe that our readers have already found out the right size after following the guide mentioned in the post. Don’t forget to tell us in the comment section about whether this process works accurately for you or not?

Eric Arnow