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Last updated: 31 May 2024

4kW Solar Systems with Battery in the UK: Costs & Electricity Production

4kW solar system
  • A 4kW solar system is the best system size for 3-4 bedroom houses in the UK.
  • A 4kW solar system costs around £7,000 - £8,000 and breaks even in 14 years.
  • A 4kW solar system with battery costs anywhere between £12,000 - £20,500.
  • 4kW solar systems produce about 8 – 9.5kWh of energy in a day.

Solar panels for home come in a variety of sizes, so, if you’re wondering whether a 4kW solar system is the right fit for your home, you’ve come to the right place. In what follows, we walk you through the specificities of 4kW solar panels, as well as what it takes to pair a 4kW solar system with a battery in the UK. 

If you decide that installing a 4kw solar system is the right choice for you, the next step in your green energy journey is to find a reliable solar expert to work with. Looking for a solar panel installer on your own can take hours or even days of tedious research. By the end of it, you might not even have found what you’re looking for. 

Instead of wasting your time and energy, let us help you get started in just 30 seconds. By filling in our short form, you can request free non-binding quotes from up to 4 local solar panel installers. They will then reach out to you with quotes for services and you can easily compare installers and figures to find the best deal for your home. Simply click below and get started today!

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What does a 4kW solar system generate in electricity per day?

If you are considering installing solar panels, you are probably wondering: “What should a 4kw solar system generate per day in the UK?” Well, the answer is that a 4kW system produces around 8 – 9.5kWh of energy in a day, which adds up to an estimated annual output of 2,920 - 3467kWh per year. 

That said, there are a few factors that will affect the efficient energy production of your solar panels. One aspect to consider is your location, as solar panels have varying degrees of efficiency per region in the UK. For instance, solar panels in Scotland produce a different amount of energy than solar panels in Wales

Below you can find a rundown of how much energy a 4kW solar panel system produces in a day per region. Bear in mind that these are estimates that might vary depending on your situation.

Average Energy Production of a 4kW System Per Region
South East EnglandNorth West EnglandWalesScotlandNorthern Ireland
Up to 10kWh per dayUp to 8,2kWh per dayUp to 10kWh per dayUp to 8,5kWh per dayUp to 9,6kWh per day
Energy production 4kW solar system

If you need less energy than this system produces, you might want to consider the 3kW solar system with battery.

4kW solar system price: Solar panels + battery

Currently, the cost of solar panels in the UK ranges anywhere from £3,000 to £15,000. 4kW solar panels cost about £7,000 - £8,000 and paired with a solar battery the price can go up to £12,000 - £20,500

Typically, if you have a 4kW solar panel system, you will require a solar battery with a storage capacity ranging between 10 and 20kWh. This will have significant implications for the total cost of your solar panel system. 

Below you can find out more about the price of solar panels, solar battery price, and labour costs in the UK today:

Costs of Installing a 4kW Solar System
Components of a 4kw SystemEstimated Cost
Solar panels£7,000 - £8,000
Solar battery (10 - 20kWh storage capacity)£5,000 - £12,500
Installation costs £1,000 – £2,000
Maintenance costs per year£100 - £200

What is the break-even point and lifespan of a 4kW solar panel system?

The estimated return on investment period for a 4kW solar panel system is 14 years. This is because you can expect to save up to £730 on your electricity bills per year and the initial cost of your system is around £7,000 - £8,000. Considering that solar panels have a lifespan of around 25 years, you will be able to enjoy free green energy for more than a decade after breaking even on your investment in a 4kW solar system.

If you pair your 4kW solar panels with a solar battery storage system, your total expenses will be significantly higher, ranging from £12,000 - £20,500. Bearing in mind the savings figures of a 4kW system, you can expect to break even on your investment in solar panels and a solar battery in around 16 - 28 years.

Break-even point 4kW solar system

If you are ready to reap the long-term benefits of installing solar panels, the next thing you will want to do is consult a solar panel expert. They can offer you advice tailored to your situation to help you make the most of your 4kW solar system. 

Ready to speak to a solar panel installer but have no idea where to find one you can trust? We’re here to help. By filling in our 30-second form, you can get in touch with up to 4 local installers vetted by us. They will then get back to you with quotes for their services and you can choose the one you want to work with. Just click below to request free, non-binding quotes now!

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What are the pros and cons of 4kW solar systems?

Before choosing to install 4kW solar panels for your home, you will want to carefully weigh the advantages and disadvantages of such a system.

Pros and cons 4kW solar system

Advantages of a 4kW solar system

  • Save on your electricity bills: A 4kW solar panel system can generate free green energy for your home, allowing you to avoid overspending on your yearly energy expenses. 
  • Reduce your carbon footprint: Solar panels generate renewable energy that allows you to reduce your dependence on fossil fuels when it comes to energy consumption. 
  • Become independent from the grid: If you pair your 4kW solar system with a solar battery, you will not have to rely on the grid for electricity. Your solar panels can generate enough electricity year-round and by storing it in a battery you ensure that you can enjoy free energy at all times. 
  • Earn money back: You can sell any excess electricity generated by your 4kW system back to the grid and receive payments for each kilowatt/hour of energy transferred. 

Disadvantages of a 4kW solar system

  • High initial cost: A 4kW solar panel system is far from cheap and if you also pair it with a solar battery, your total expenses will be quite high. 
  • More efficient during the day: Even though they do not require direct sunlight to generate electricity, solar panels are much more efficient during the day. This means that without a solar battery, you might not be able to enjoy free energy at all times. 
  • Might not generate enough electricity for your home: Depending on the size of your home, the number of people in your household, and your energy needs, a 4kW solar panel might not produce enough electricity for your home. For larger households, consider switching to a 6kW solar panel system or 12kW solar system.

4kW solar system with battery in the UK: Is it worth it?

It makes sense to ask yourself: “Are solar panels worth it?” The answer is yes, a 4kW solar panel system and a solar battery are a great investment! Not only will this allow you to avoid overspending on your yearly energy bills, but you will also be reducing your carbon footprint. 

However, before choosing to purchase solar panels and a solar battery, you should bear in mind that they are a long-term investment. A 4kW solar system has a break-even point of around 14 years, and when paired with a solar battery this period goes up to 16 to 28 years

Even so, since solar panels have a life expectancy of around 25 years, depending on your situation, you will be able to enjoy free green energy for years after you have gotten the return on your investment. To fully benefit from your 4kW solar panels, you will want to ensure that you choose the best solar panels in the UK for your system.

For homes that have above-average energy consumption, 5kW systems might be more appropriate. A 5kw solar system with a battery in the UK can cost £12,000 to £19,000 and without a battery it will cost between £8,000 and £9,000.

Find 4kW solar panel installers near you

If the benefits of a 4kW solar panel have convinced you or if you’re still on the fence, the next step you will want to take is consulting a solar expert. They can offer you advice tailored to your situation to help you make the most of your solar system.

Fortunately, you don’t have to look any further for a reliable solar panel installer. We work with a broad network of reputable professionals and can help you get in touch with them in no time. 

Instead of wasting hours of your time on tedious research, simply fill in our 30-second form and request free, non-binding quotes from up to 4 solar panel installers in your area. Then, you can choose the installer you want to consult and work with. Not only that, but you can also compare quotes to secure the best deal for your new 4kW solar panel system. Simply click below to get started today!

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