Is 7kW too big for an average home?

No — the average UK home uses 2,900 kWh/yr, but adding an EV (1,500-3,000 kWh) or heat pump (4,000-6,000 kWh) pushes demand to 5,000-9,000 kWh. A 7kW system future-proofs for these additions.

Will I hit the export limit?

On single-phase: export limited to 3.68kW. A 7kW system occasionally curtails on peak sunny days. With a battery: negligible curtailment because surplus charges the battery.

How much roof space for 7kW?

30-32m² for 17-18 panels. This fits on one large roof face of a detached or semi-detached home, or split across two faces.

What battery for a 7kW system?

8-10kWh recommended. GivEnergy 9.5kWh (£4,500-£5,500) or BYD HVS 7.7kWh (£4,000-£5,000) are popular pairings.

7kW Solar System UK

Last updated: 18 March 2026

Independently written

7kW system — 7kW solar: 17-18 panels, £7,500-£10,000, saves £750-£1,200/yr.

How 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%.

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