10 kW system pricing
10 kW Solar System Cost UK 2026
A 10 kW solar PV system sits at the boundary between large domestic and light commercial. It needs three-phase electrical supply, G99 DNO paperwork, and roughly 55 m² of usable roof. Generates ~8,500 kWh/year.
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What you pay
Price ranges
| Specification | Price range |
|---|---|
| Standard 10 kW (26 panels, 10 kW hybrid inverter) | £12,000 – £13,500 |
| Premium 10 kW (Tier-1 panels, full optimisers) | £13,800 – £15,500 |
| With 27 kWh battery storage stack | £20,500 – £24,000 |
Where the money goes
Cost breakdown
| Component | % of cost |
|---|---|
| Panels (26 × 380W) | 26% |
| Inverter (10 kW hybrid, 3-phase) | 15% |
| Optimisers | 8% |
| Scaffolding + labour (2 days) | 15% |
| DNO G99 + substation paperwork | 5% |
| Margin + overheads | 31% |
What changes the price
Variables
- Three-phase supply required Most domestic UK is single-phase; upgrade to 3-phase £4,000–£12,000 if not already present
- G99 substation upgrade £0 if grid OK, up to £40k if local substation needs reinforcement
- Annual Investment Allowance (commercial) If business, AIA tax relief £3,000–£3,500 in year one (effective net cost £8,500–£12,000)
Return on investment
Payback model
Annual savings and payback by tariff combination. Modelled against typical UK consumption profile.
| Setup | Annual saving | Payback |
|---|---|---|
| Domestic, Octopus Flux + 13.5 kWh battery | £2,200 | 10 years |
| Commercial with AIA tax relief | £3,400 | 5–7 years |
Common questions
FAQs
Is 10 kW worth it for a domestic home?
Only if you have very high consumption (8,000+ kWh/year), a fleet of EVs, or a heat pump system serving a 5+ bed property. Otherwise 6 kW + battery is more cost-efficient.
Can I get 10 kW on single-phase supply?
No — most DNOs cap single-phase at 3.68 kW (16A) export. 10 kW needs three-phase. We model the upgrade cost as part of the survey.
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