Question 1

How much do solar panels cost in the UK?

Accepted Answer

A typical 4kW system (10 panels) costs £5,000–£7,000 installed, including 0% VAT. A larger 6kW system runs £7,000–£9,000. Prices have dropped significantly since 2022 and are now at their most affordable ever for UK homeowners.

Question 2

How many solar panels do I need for my house?

Accepted Answer

Most UK homes do well with 10–14 panels (3.5–5kW). A 3-bed semi typically needs a 4kW system, while a larger detached house might want 5–6kW. The right size depends on your electricity usage, roof space, and whether you plan to add a battery or heat pump later.

Question 3

Do solar panels work on cloudy days?

Accepted Answer

Yes. Solar panels generate electricity from daylight, not direct sunshine. On a cloudy day you'll produce around 10–25% of peak output. A typical UK 4kW system generates 3,400–3,800 kWh per year — enough to cover 50–70% of an average household's electricity needs across the whole year.

Question 4

How long do solar panels take to pay for themselves?

Accepted Answer

Most UK homeowners see payback in 6–8 years, depending on system size, electricity usage, and how much you export. After payback, you get 17+ years of essentially free electricity (panels last 25–30 years). Adding a battery shortens payback if you use a lot of electricity in the evening.

Question 5

Do I need planning permission for solar panels?

Accepted Answer

Usually not. Solar panels on a house roof are permitted development in England, Scotland, and Wales, as long as they don't protrude more than 200mm from the roof surface and aren't on a listed building or in a conservation area. Ground-mounted systems over 9m² do need planning permission.

Question 6

Can I sell excess electricity back to the grid?

Accepted Answer

Yes, through the Smart Export Guarantee (SEG). Your energy supplier pays you for every unit of electricity you export. Rates vary — Octopus Energy currently offers around 15p/kWh, while most other suppliers pay 3–6p/kWh. You'll need a smart meter to qualify.

Question 7

Should I add a battery to my solar panels?

Accepted Answer

It depends on when you use electricity. If you're out during the day and use most power in the evening, a battery stores daytime solar for evening use — saving you buying from the grid at 24p/kWh. A 5kWh battery costs £2,500–£4,000. If you're home during the day and use power as it's generated, a battery adds less value.

Question 8

Are there any grants for solar panels in the UK?

Accepted Answer

There's no direct government grant for solar panels in England, but you get 0% VAT (saving roughly £1,000 on a typical system). In Scotland, Home Energy Scotland offers interest-free loans up to £6,000 with £750 cashback. ECO4 can fund solar in some cases for low-income households.

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