Blog | Oakray Rewewables

How much do solar panel systems cost in the UK?

Written by Oakray Renewables | Feb 6, 2025 9:15:00 AM

If you're considering going green with solar energy, you might be wondering, “How much will it cost me?” Solar panels are an excellent investment for your home, but there can be a number of different factors that contribute to the final cost.

In this article, we'll break down the costs of solar panel systems in the UK step by step and go into detail about each expense. Plus, we’ll go over some tips to maximise your investment.

Breaking down the initial costs - what influences the price of solar panels?

When it comes to solar panels, prices can vary widely depending on the system size, the quality of materials and your specific energy needs. The first major discrepancy is the solar panel system size.

3 kW system

A 3 kW system is ideal for small households or those with lower energy consumption. This system generally costs between £4,000 and £6,000 depending on your roof layout and installation costs. The lower price is due to fewer panels being required (usually around 10) and less labour involved in the installation.

4 kW system

For an average UK home, a 4 kW system is the sweet spot. With prices ranging between £5,000 and £7,000, this system can produce enough electricity to cover a typical family’s daily energy usage. It includes approximately 12–14 panels, which explains the slightly higher cost compared to the 3 kW system.

5 kW+ system

Larger households, commercial buildings or those aiming to export significant energy back to the grid may opt for a 5 kW system or above. At a cost of £9,000 to £10,000, this system uses around 16–20 panels, requiring more materials, labour and space for installation.

Why the price difference?

The larger the system, the more energy it can generate. However, this also means more panels, a larger inverter and more labour for installation. The upfront cost may be higher, but the potential savings and energy independence over time are well worth it.

 

🌿 What is the environmental impact of solar energy?

Installation costs - what’s included?

The price tag for your solar panels goes beyond the panels themselves and includes professional installation, which is crucial for ensuring your system operates efficiently. Installers handle everything from designing the layout to wiring and connecting the system to your home's electricity supply.

Why is installation so important?

Solar panels need to be carefully positioned for maximum sunlight exposure, typically on a south-facing roof. If you have a challenging roof (e.g. unusual angles or shading), installation costs might be higher. But remember, a well-installed system will pay for itself faster by maximising energy production.

The role and value of solar batteries

Adding a battery to your solar panel system allows you to store excess energy for later use, such as during the evening or on cloudy days. A solar battery typically costs between £4,000 and £6,000, bringing the total system cost to approximately £13,000–£15,500 if included.

Without a battery, any unused energy is exported to the grid, often at a lower rate than what you pay for electricity. A battery ensures you make the most of your system by using stored power when electricity prices are higher, saving you even more money in the long run.

Keeping your panels in tip top shape with regular maintenance

Solar panels are famously low-maintenance, but occasional cleaning and servicing are necessary to keep them running efficiently.

  • Cleaning costs - Dirt and grime can reduce efficiency, so a professional cleaning every six months can cost around £4 to £15 per panel. If you’re comfortable climbing a ladder, a DIY clean can save you money here.
  • Inverter replacement - Inverters, which convert the electricity your panels generate into usable power, need replacing every 10–15 years. Expect to pay around £800 to £1,000 for a replacement.
  • Annual check-ups - An annual service costs between £100 and £200, ensuring everything runs smoothly.

Pro tip: Many installers, including Oakray Renewables, offer maintenance packages to simplify upkeep and provide peace of mind.

 

🏡 The benefits of solar panels for UK homeowners

Invest in a bright future with solar

Investing in a solar panel system helps you cut costs, gain energy independence and boost your property value while making a positive impact on the environment. While the initial costs may seem daunting, the combination of savings, incentives and environmental benefits make it a decision that pays off in more ways than one.

If you're ready to explore solar for your home, Oakray Renewables is here to help. Our custom solar solutions are designed to fit your specific energy needs and future-proof your investment. Contact us today to start your journey towards sustainable living!