7kW 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 7kW solar system cost?
A 7kW solar system is an increasingly popular mid-to-large residential installation. Specs: 17-18 panels (at 400W each). Roof space: 30-32m². Cost: £7,500-£10,000 at 0% VAT. Annual generation: 6,300-7,350 kWh. Annual savings: £750-£1,200 (depending on self-consumption). Payback: 7-11 years. 25-year profit: £15,000-£25,000. Ideal for: 3-4 bed homes with above-average consumption, EV owners wanting solar charging, homes planning a heat pump. Battery recommendation: 10kWh (£4,000-£5,500) boosts self-consumption from 35-45% to 70-85%.
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.