9kW Solar System UK
Find the right system size for your roof
Panel count depends on your electricity use, roof space and direction — not on a rule of thumb. Get a recommended size and what it should cost.
Size My SystemFree calculator. No contact details required to see your result.
Find the right system size for your roof
Panel count depends on your electricity use, roof space and direction — not on a rule of thumb. Get a recommended size and what it should cost.
Size My SystemHow much does a 9kW solar system cost?
A 9kW solar system is a large residential installation. Specs: 22-23 panels (at 400W). Roof space: 38-42m². Cost: £9,000-£12,500 at 0% VAT. Annual generation: 8,100-9,450 kWh. Savings: £900-£1,500/yr. Payback: 7-11 years. 25-year profit: £18,000-£30,000. This size covers the average home PLUS a heat pump OR an EV — making it excellent for future-proofing. Export limitation (3.68kW single-phase) becomes relevant — a battery is strongly recommended to capture surplus.
Frequently Asked Questions
Related guides
Related: Home Heating Systems
Solar panels are most powerful when combined with an efficient heating system. Heat pumps use solar-generated electricity to heat your home at 300-400% efficiency — making them the ideal partner for solar.
Learn more about how air source heat pumps work alongside solar panels.
Heat pumps use electricity at 300-400% efficiency, making them ideal partners for solar.
Heat pump installation typically takes 2-3 days and is best planned alongside solar.
From our sister site Home Heat Pump Guide
You might also like
Find the right system size for your roof
Panel count depends on your electricity use, roof space and direction — not on a rule of thumb. Get a recommended size and what it should cost.
Size My SystemFree calculator. No contact details required to see your result.