System Size for a 4-Bed House
A 4-bedroom house typically uses 3,500-4,500 kWh/year. A 5kW system (12 panels) covers most usage, while a 6kW system (14 panels) provides extra capacity for an EV charger or heat pump. Both sizes fit comfortably on a standard 4-bed roof.
Cost Breakdown
5kW system: £6,500-£7,500 | 6kW system: £7,500-£9,500 | Add battery (5kWh): +£3,000-£4,000. These prices include installation, scaffolding, DNO notification, and all warranties. Zero VAT on residential installations.
Expected Savings
A 5kW system saves £700-£1,000/year; a 6kW system saves £800-£1,200/year. Add battery storage for an extra £200-£400/year. Payback period is typically 6-8 years, leaving 17-19+ years of virtually free electricity.
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