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What size solar PV system do I need?

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If you’re thinking about getting your own solar installation, you’re probably wondering what size of system you need. Well, the answer isn’t one-size-fits-all and it involves thinking about a few different things.

From how much roof space you have to how much energy you use – the answer to this question will be unique to your energy habits and property.

In this blog, we’ll run through all the things you need to know so you can make a confident decision on your own solar system size. Let’s get into it.

Key Takeaways

What affects the solar system size you need?

There are a number of different things that affect the size of the solar system you’ll need for your home. These include:

  • The amount of kWh of electricity your household consumes
  • The hours of daylight your location receives
  • The efficiency of the panels
  • The size and positioning of your panels

All of these things work together, impacting the amount of electricity you can generate and, the size of the system you’ll need.

For residents in Wigan, understanding these factors is crucial to optimising solar energy generation. Visit our Solar Installations Wigan page to learn more about how we tailor solar solutions to fit your specific needs.

How do I calculate the right solar array size?

Calculating the right solar array size involves a few steps. First, look at your electricity bills to figure out your average kWh of electricity usage.

Then, think about the power output of the solar panels you’re interested in, typically measured in watts. Monocrystalline panels, known for their efficiency, offer a higher power output in the same amount of roof space than other types, like polycrystalline.

The hours of sunlight your property gets will also directly impact the amount of energy your solar panels can produce. Combining these factors allows you to estimate the solar system size that will meet your electricity needs.

How do I find out how many solar panels I need?

To find out how many solar panels you need, first calculate your home’s total electricity usage in kWh. Then, divide this number by the power output of the solar panels you’re considering and the average hours of daylight your area receives.

This calculation will give you a rough estimate of the number of panels you’ll need to cover your electricity needs. Remember, the efficiency of solar panels during peak sunlight hours will have a big impact on your system’s overall performance.

This decision will also be based on your specific needs and wants. For example, if you’re looking to future proof your property, you may want to go for more panels. Unsure of where to start?

Reach out to our experts, and we’ll be happy to help.

Get a solar panel installation quote

Is my roof suitable for solar panels?

Ideal roofs have enough space to fit the needed panels and receive plenty of sunlight, particularly during peak daylight hours.

South-facing roofs in the UK tend to receive the most sunlight. However, they are not the only option. East-facing roofs, for example, also receive enough daylight to generate good amounts of electricity.

You’ll also need to think about things like shading from trees or buildings, and the roof’s structural integrity. As long as your roof is strong and not sheltered from the sun, it should be a good fit for a solar panel installation.

What is the average number of solar panels in a UK home?

Average UK homes need a different number of solar panels depending on their size and electricity consumption. A typical 1-2 bedroom house needs 6-7 panels for a 2.5kW system, while a 3-bedroom home requires around 10 panels for a 3.5kW setup (Independent Advisor).

Larger homes, such as those with 4-5 bedrooms, may need 14-15 panels to achieve a 6kW solar system size, though they could likely accommodate 20+ panels, depending on the roof layout.

These numbers can vary based on the solar panels’ efficiency, your home’s electricity bills, and the hours of sunlight your property receives. You should also consider how much energy you consume, alongside your household energy patterns, to make a choice you’re confident with.

If you need help figuring out the size or amount of solar panels you need, reach out to our team today.

Start your solar journey with Grant Store

We know there’s a lot to figure out, but using solar power to reduce your bills and your carbon footprint doesn’t have to be confusing.

This is where our team at Grant Store shines.

You can count on our expert advice and bespoke solar solutions. Whether it’s pinpointing the perfect solar system size, understanding the advantages of monocrystalline panels, or optimising your setup, our experts have the answers you’re looking for.

Ready to get started? Give us a call today for your free quote and consultation. Clean, green, cheap energy is waiting for you.

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