12kW 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 12kW solar system cost?
A 12kW solar system is a large residential or small commercial installation. Specs: 28-30 panels (at 400W each). Roof space needed: 50-55m². Cost: £12,000-£16,000 at 0% VAT. Annual generation: 10,800-12,600 kWh — enough to cover most household needs INCLUDING a heat pump AND EV charging. Annual savings: £1,200-£2,200 (with good self-consumption). Payback: 7-11 years. 25-year profit: £25,000-£45,000. Near energy independence: with a 13.5-20kWh battery, self-consumption reaches 80-95%. Export limitation applies (3.68kW single phase) — battery is essential at this size to avoid curtailment. Three-phase properties: no export limitation issues.
Frequently Asked Questions
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
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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.