How much does a 8kW solar system cost?
Priced June 2026
A 8kW solar system costs £11,000–£14,500 installed — about 18 panels, generating ~6,800 kWh a year.
Best suited to 4–5 bed home, high usage. Payback is typically 9–13 years.
| Typical installed cost | £11,000–£14,500 |
| Number of panels | ~18 panels |
| Annual generation | ~6,800 kWh |
| Typical payback | 9–13 years |
| Best suited to | 4–5 bed home, high usage |
| Roughly per kW | £1,563/kW |
A 8kW system sits at the larger end of typical UK home installs. The price covers the 18 panels, the inverter, mounting and scaffolding, certified labour and MCS certification — at 0% VAT until 31 March 2027. Here's how it compares to other system sizes:
| System | Low | Typical | High |
|---|---|---|---|
| 3kW | £5,000 | £5,500 | £6,500 |
| 4kW | £6,000 | £7,000 | £8,000 |
| 5kW | £7,500 | £8,500 | £9,800 |
| 6kW | £9,000 | £10,000 | £11,500 |
| 8kW | £11,000 | £12,500 | £14,500 |
| 10kW | £13,000 | £15,000 | £17,000 |
Whether a 8kW system is right for you depends less on your property type than on how much electricity you actually use. Put your own usage into the free calculator to see your cost, saving and payback, or see the full cost-of-solar breakdown.
Frequently asked questions
How much does a 8kW solar system cost in the UK?
A 8kW solar system typically costs £11,000–£14,500 installed in 2026 (panels only, 0% VAT), using around 18 panels — roughly £1,563 per kW.
How much electricity does a 8kW system generate?
A 8kW system generates about 6,800 kWh a year in the UK (south-facing, unshaded), enough for 4–5 bed home, high usage.
How long does a 8kW system take to pay back?
Typically 9–13 years on panels alone, depending on how much generation you use yourself, your tariff and your region.