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How many watts do I need to supply a house?

You can easily calculate the number of watts used by a home, in this article we will analyze how many watts I need to supply a home. If your interest is to put a solar photovoltaic system to produce electricity and meet your electricity needs, what you need to know first is In our home we have several devices that run on electricity, but How many watts do I need to supply a house?

Whether you are thinking of disconnecting from the power grid or just having an idea of  ​​how many watts I need to supply a home   before purchasing a grid-connected solar power system, inquire about the power consumption of various equipment and functions in Your Home. not a bad idea.

How many watts do I need to supply a house?

Knowing  how many watts are needed for a home, your numbers help you gauge your home’s true energy profile, and find out if you have an energetic vampire on your hands.

These expensive energy thieves could be consuming kilowatt hours of their energy meter, without them knowing.

And once you buy a solar power system, you really realize your home’s efficiency and energy use. After all, you want to make the most of every watt of power it produces.

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This is what you should expect from your home’s overall energy profile and how it breaks down into individual appliances as well.

How many watts are needed for a home? : The average total energy consumption per household

How many watts does a home consume on average?  In 2015, the average energy consumption for a household was 10,812 kilowatts per hour, with a monthly average of 901 kilowatt hours, according to EE’s Energy Information Association. UU.

However, your current power generation can vary, depending on the size of your home, the efficiency of your appliances and lighting, and its insulation and airtightness, among other factors.

Furthermore, its location can also take into account the equation (in Louisiana, for example, which has a much higher humid and semi-tropical climate than the rest of the United States, reaching 15,435 kilowatt hours).

On the other hand, Hawaii, which has some of the highest numbers of solar installations in the country, uses only 6,166 kilowatt hours on average.

So your individual numbers may vary. The best thing you can do is calculate your unique solar usage averages using a solar calculator.

Use of energy in your kitchen

With a refrigerator, dishwasher, microwave, stove and oven, your kitchen sees some of the heaviest energy consumption numbers in a home. Here’s how the different devices consume per hour:

  • Dishwasher  : 1200 to 1500 watts
  • Microwave  : 966-1723 watts
  • Oven  : 2150 watts
  • Coffee machine  : 800 to 1400 watts
  • Refrigerator  : 150 to 400 watts

If we take the lower values ​​as an example, if we were to calculate the average consumption of each device.

1200 + 966 + 2150 + 800 + 150 = 5266 watts / h or an equivalent of 5.266 kw / h in the kitchen

It might surprise you to know that refrigerators have such low energy consumption. Most modern refrigerators use a vapor compression cycle which helps them save energy overall.

To know how many solar panels I need in a refrigerator,  we must determine the daily consumption of the refrigerator and based on this data and choose the power of the solar panels to be installed we can find out without problems.

A modern low-consumption refrigerator, for example an electricity consumption of 312 kWh per year.

If we use panels of 250 w.

312: 12 = 26 kwh al mese 26: 30 = 0,86 kwh x 1000 = 860 wh

860: 250 = 3.44 panels i.e. we need 4 x 250w solar panels

How many watts I need to supply a house: Use of energy in your living room

When you think of small appliances, your living room is likely to be obvious. With a computer resting on his lap and a television becoming his latest obsession with drunkenness, he is certainly consuming some energy in his spare time. Here’s how much:

Use of energy in your living room


Expenses for a notebook 45 w

  • Laptop  : 45 to 100 watts (numbers may or may not be affected by device load)
  • Flat screen TV  : 60 to 180 watts, depending on model and size.

How many watts do I need to supply a house?


This is an example of the label of an LCD TV that consumes 180 w / h, the idea would be to check the consumption of each household appliance or electrical device used in the house.

In the laundry

Washers and dryers also absorb a lot of energy per year. In fact, your hair dryer is one of the main energy consumers in your home, after your HVAC system and water heater. For comparison, these are the usage numbers:

  •  Rop as a washing machine : 1580 w


  • Dryer  : 1000 to 4000 watts

How many watts do I need to supply a house?


How many watts do I need to supply a house: Heating and cooling devices

Now we analyze how many watts I need to supply a house and its kitchen appliances.

There are no two ways to avoid this: keeping the interior of your home at a comfortable temperature takes up a lot of energy.

In fact, your HVAC system uses the maximum amount of energy from any other device or device in your home. Independent heating and cooling devices, such as space heaters, also absorb a good amount of energy. Here’s what these usage numbers look like:

  • Central heating oven  : 340 watts
  • Portable fan heater  : from 2000 to 3000 watts
  • Centralized air conditioning  : from 1000 to 4000 watts
  • Window air unit  : 900 to 1440 watts, depending on size.

Of course, these numbers are very different depending on the climate, how often you turn on the heating and cooling, the efficiency and age of your system, and how well it maintains it.

Get a more accurate energy calculation

These numbers are only averages, of course, and are not always completely reliable, as their numbers will largely depend on the size, model and use of each product.

Also, most devices are getting more and more efficient, so stats can be dated quickly.

The best way to understand where you are using the most energy and where you are doing well is to conduct a home energy audit on your property by an energy professional.

In fact, if you are going to install solar energy soon, it is highly recommended. In fact, some solar companies will send out an auditor as part of the installation process.

Or your energy provider may offer this service for free or at a discounted rate. This professional can look around your home for the biggest electric hogs, not only with your appliances and heating, ventilation and air conditioning systems, but also places where heating and cooling can leak due to leaks and inadequate insulation. .

However, you can also make your own estimates using the Department of Energy’s estimation tool.

Knowing the power consumption and performance at home will only help your opportunity to conserve the maximum amount of electricity possible and, at the same time, reap the rewards of your utility savings!

We have reached the end of the article on How many watts do I need to supply a house? I hope the concepts have been understood.

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