Guide to Buying Solar Panels
Switching to solar energy is a step towards greener living, cost efficiency, and energy independence. However, it may seem daunting to understand what kind of solar panels to buy, how much to invest and how to ensure peak performance. This guide will break it down for you, so you can make an informed choice for your home and the planet.
Types of Solar Panels
When choosing solar panels, it’s essential to understand the main types available on the market:
Monocrystalline Panels—Known for their high efficiency (up to 22%) and sleek black design, these panels are ideal for limited roof space as they generate more power per square metre.
Polycrystalline Panels – Typically more affordable but slightly less efficient than monocrystalline options, these panels have a blue hue and are perfect for larger roof spaces.
Thin-film Panels – Flexible and lightweight, thin-film panels work well when weight and aesthetics are a concern. However, they tend to be less efficient and larger in size for equivalent power output.
Find out about all the other types of solar panel in this blog.
Solar Panel Prices
The investment in solar panels can vary widely based on the size and efficiency of the system. Here’s a quick breakdown:
Small Systems (2kW–3kW): Best for smaller households, starting at £3,000–£5,000.
Medium Systems (4kW): Most common for UK families, typically costing £5,000–£7,000.
Large Systems (5kW+): Suitable for larger homes or high energy needs, pricing can go upwards of £7,000.
Look into government incentives or local financing schemes like the ECO4 programme to make solar energy more affordable and practical for your household.
Find out more in our dedicated blog about solar panel prices.
Solar Panel Sizes
Solar panels come in various sizes, typically measured in wattage per panel. The most common sizes range between 250W and 400W per panel. While lower-capacity panels may cost less individually, they require more panels to meet energy needs. On the other hand, higher-capacity panels are efficient and save roof space but often come with a higher price tag.
Your available roof area, energy needs and overall budget will determine the optimal panel size for your system.
Find out more in our blog about solar panel dimensions and sizes.
How Long Do Solar Panels Last?
Most solar panels come with a warranty of 20–25 years, which guarantees their performance during this time. However, this doesn't mean your panels stop working after the warranty period ends. Many solar panels continue to generate electricity for decades, with only slight efficiency degradation over time. On average, solar panels lose about 0.5–1% of their efficiency per year, meaning that even after 25 years, your panels could still operate at 75–85% of their original capacity.
Proper maintenance can play a significant role in extending the lifespan of your solar panels. Regularly cleaning them to remove dirt, leaves, or bird droppings ensures they can absorb maximum sunlight. Additionally, inspecting for any physical damage, such as cracks or loose wiring, can help address issues early before they compromise performance.
Find out more in our blog about how long solar panels last.
How Many Solar Panels Do I Need?
Calculating the number of panels needed depends on the following factors:
Energy Consumption: Analyse your annual energy usage; the average UK home consumes roughly 3,500kWh per year. If your needs are higher, you’ll require more panels.
Sunlight Exposure: Install on south-facing roofs with minimal shading to maximise sunlight exposure. For example, if you receive around 4 hours of effective daily sunlight, you'll need approximately 10–12 panels with a 300W capacity for a 4kW system.
Panel Efficiency: Higher efficiency panels generate more energy, meaning fewer panels are needed.
You can also factor in potential future energy increases (e.g., an electric car) to ensure your installation supports long-term energy goals.
Find out more in our blog about the right number of solar panels.
Conservation Area Solar Panels
If your property is in a conservation area, it’s important to understand that there may be restrictions on solar panel installations to protect the area’s historical or architectural significance. These regulations are designed to maintain the visual appeal and character of the location, which means traditional solar panel designs might not always be permitted.
In such cases, ground-mounted solar installations can be a viable alternative, allowing you to harness solar energy without altering the appearance of your property. Additionally, advancements in solar panel technology have led to the development of less conspicuous designs, such as solar tiles or panels that blend more seamlessly with roofing materials. These options may offer the perfect balance between functionality and preserving the area’s aesthetics.
Find out more in our blog about conservation area solar panels.
Do I Need Planning Permission for Solar Panels?
In most cases, you don’t need planning permission to install solar panels on your property in the UK. Solar panel installations typically fall under permitted development rights, which allow homeowners to make certain improvements without formal approval. This makes it easier for people to adopt renewable energy solutions and reduce their carbon footprint.
However, there are specific exceptions where planning permission may be required. If your property is a listed building, a site of historical significance, or located in a conservation area or national park, additional rules may apply. These restrictions are in place to preserve the character and appearance of protected areas or buildings, so you may need to obtain permission before proceeding with the installation.
Find out more in our blog about planning permission for solar panels.
Let's Chat
Investing in solar energy is more than saving on energy bills — it's about taking control of your energy use, reducing your environmental impact, and ensuring a greener future.
Need help with your solar panel setup? MPC Energy Ltd specialises in designing bespoke, efficient solar systems for homeowners across Scotland. Whether you want detailed guidance or a complete installation service, we’re just a call away.
