Can I install 10kW on a single-phase supply?

Yes — but your export will be limited to 3.68kW (single phase). This means some surplus is curtailed on very sunny days. With a battery: curtailment is negligible. Upgrading to three-phase is expensive (£3,000-£5,000+).

Is 10kW too big for a house?

Not if you have: a heat pump (adds 4,000-6,000 kWh demand), an EV (adds 1,500-3,000 kWh), or high base consumption. A 10kW system future-proofs against rising electricity use.

What battery size for a 10kW system?

10-13.5kWh minimum. A 10kW system generates significant surplus — a larger battery captures more value. Some homeowners pair with 15-20kWh batteries for maximum self-consumption.

How much roof space do I need?

42-50m² for 24-25 panels. This is typically one full side of a large detached house roof, or split across two faces. Your installer will optimise panel layout during the site survey.

10kW Solar System UK

By Home Solar Guide Team|Updated 18 March 2026|guide

Independently written | Evidence-based | Sources cited

10kW solar system — 10kW solar: 24-25 panels, £10,000-£14,000, saves £1,000-£1,800/yr.

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How much does a 10kW solar system cost?

A 10kW solar panel system is a large residential installation. Specs: 24-25 panels (at 400W each). Roof space needed: 42-50m². Cost: £10,000-£14,000 at 0% VAT. Annual generation: 9,000-10,500 kWh. Annual savings: £1,000-£1,800 (depending on self-consumption). Payback: 7-12 years. 25-year profit: £20,000-£35,000. Ideal for: 4-5+ bed detached homes, homes with heat pumps (4,000-6,000 kWh extra), EV charging (1,500-3,000 kWh extra), high-consumption households. Requires: large south/east/west-facing roof, DNO notification (G99), possibly export limitation (3.68kW single phase). Battery strongly recommended for systems this size: 10-13.5kWh (£4,000-£6,000 extra).

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.

air source heat pump guide

Learn more about how air source heat pumps work alongside solar panels.

heat pump running costs in the UK

Heat pumps use electricity at 300-400% efficiency, making them ideal partners for solar.

heat pump installation process

Heat pump installation typically takes 2-3 days and is best planned alongside solar.

From our sister site Home Heat Pump Guide