How much you can save on bills with solar as a UK homeowner?

How Many Solar Panels Do I Need?

A Guide to Calculating Your Solar Panel Size

» The number of solar panels is dependent on your energy consumption, sun hours, and roof size.

» In the UK, 12 solar panels are needed for a 3kW solar installation, and 24 panels for a 6kW installation.

» The bigger the size of the panel, the more energy is generated per square meter.

*Table assuming 250Wp Solar Panel dimensions: 1.6 x 1 m = 1.6 m²

When determining how many solar panels you need, there are three key factors to consider to get the most benefits of solar energy:

  • Your average daily energy consumption

  • The sun hours in your area

  • Your roof size

The primary factor in deciding how many solar panels you need is your average energy use, also known as planned usage. The total number of Kilowatt Hours (kWh) that you either use now or plan to use in your home is taken into account in this situation.

Your location has an impact on the amount of electricity that solar panels can produce because it depends on the number of sun hours. The number of solar panels you'll need will depend on the number of sun hours in the UK.

Your roof's size is important since it affects the number of panels that can fit on it, the amount of energy that can be produced, and the price. It's also crucial to think about whether your roof is suitable, including if it can sustain the weight of the solar panels and their angle.

In general, the initial installation cost would be higher the more electricity your system can produce. Long-term savings, nevertheless, will also be greater. For instance, a 3kW solar panel system will be less expensive to install, but you won't be able to save as much money over the course of 25 years as you could with a 6kW system. Additionally, you can save money on VAT as of April 2022 thanks to the UK government's temporary elimination of the VAT on energy-efficient solutions.

Do you want to know how many panels you require?

UtilityKing can assist you with this. Receive up to four custom quotes from suppliers by filling out the contact form at the top. This service we provide is totally free and non-obligatory.

What Is the Average Number of Solar Panels In A UK Home?

The number of people living in a household is one of the determining variables in calculating how many solar panels you require. A typical household of 2-3 people uses 2,900 kWh of power yearly.

For a home with more than five occupants, a 6kW solar panel system is advised, whereas a 5kW solar system is usual for a home with four occupants. Given that it is suitable for homes with 3 to 4 people, a 4kW solar system is one of the most popular sizes for domestic solar systems.

Whether you have a 3kW or 6kW installation, as well as the amount of solar panels you'll be using, will affect how many solar panels you require. For instance, 12 solar panels are required to create a 3kW solar system using 250W panels. You would require 24 solar panels for a 6kW installation.

The typical amount of solar panels depends on whether you want your solar panels to meet 100% of your electricity needs or only a portion of them.

A typical UK home uses between 3 and 6 kWh of energy per day, and some UK homes utilize solar energy to power only a portion of their energy needs, which reduces the need for as many solar panels as originally required.

How Do I Calculate the Right Solar Array Size?

Knowing how much energy you need to produce from your solar system each day will help you determine the size of solar system you require. The other crucial factors are your roof space and the number of sun hours in your region.

Your daily energy usage and the amount of energy you need to produce each day can be determined by looking at your monthly energy bills.

Your daily consumption, for instance, would be 4 kWh if your January consumption was 124 kWh per month. This indicates that the solar system should produce 4 kWh on average each day. The 4 kWh is also known as the anticipated daily electricity production of the solar system.

If you wish to invest in solar PV for your company, you can use the same procedure to determine the appropriate size for a commercial solar panel system.

Some individuals might wonder if the UK has enough sunshine for solar power. With an average of four hours of sunlight per day in the UK, installing a solar panel system might definitely be advantageous.

It's crucial to be aware that different parts of the UK see different numbers of hours of sunlight each day: England receives 4.1, Scotland receives 3.7, Northern Ireland receives 3.2, and Wales receives 3.3. It is crucial that you get advice from your neighborhood installer.

Determining Individual Solar Panel Sizes

To determine the size of the panels that you need for your house, you need to know the following:

Depending on their size or wattage rating, solar panels produce varying quantities of electricity. A 250 watt solar panel can produce up to 250 watts every sun hour, while a 300 watt solar panel can produce up to 300 watts per sun hour . For this reason, before choosing the size of your solar panels, it's crucial to understand how much electricity you'll require.

If the homeowner used 250 W solar panels in the preceding example with a daily use of 4 kWh (4,000 W/hrs.) , they would need to install 16 solar panels (4,000 WH/250 W). They would need 12 solar panels (4,000 WH/350 W) if they used a 350 W panel. Most commercially available domestic solar panels have an output of between 250 and 400 watts per hour..

Number of solar panels you can put and the amount of electricity you can produce depend on the size of your roof. This is also true because the dimensions of various solar panel sizes vary.

Using the preceding illustration, a surface area of 25.6 m2 would be needed to install 16 250W solar panels.

If you wanted to install 12 350W solar panels, you would need 22.8 m2 of surface space.

Therefore, it's critical to be aware of your available space. The typical solar panel size, weight, and measurements are shown in the table below.

*It is important to note that different brands may have different solar panel dimensions.


Now you understand that using the free energy price comparison tool of UtilityKing will not only help you to compare energy suppliers but also bring you the options to select the best electricity provider in your area. UtilityKing is also able to help you with energy switch to ensure that you will get the best energy deals from the cheapest energy supplier.

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