12kW Solar System UK

How 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.