6 kW system pricing
6 kW Solar System Cost UK 2026
A 6 kW solar PV system is the right size for 4-bed detached homes, EV owners, or anyone planning to add a heat pump. It generates roughly 5,200 kWh/year — enough to cover most of a typical larger household's consumption with battery storage.
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What you pay
Price ranges
| Specification | Price range |
|---|---|
| Basic 6 kW (string inverter, 16 panels) | £8,200 – £9,200 |
| Standard 6 kW (optimisers + monitoring) | £9,400 – £10,200 |
| Premium 6 kW (Tier-1 + 25-yr warranty) | £10,400 – £10,800 |
| With Tesla Powerwall 3 (13.5 kWh) | £15,800 – £17,500 |
| With EcoFlow PowerOcean 15 kWh | £15,200 – £16,800 |
Where the money goes
Cost breakdown
| Component | % of cost |
|---|---|
| Panels (16 × 380W) | 24% |
| Inverter (5–6 kW hybrid) | 14% |
| Optimisers | 7% |
| Scaffolding + labour | 15% |
| Hardware + cabling | 8% |
| Paperwork + commissioning | 4% |
| Margin + overheads | 28% |
What changes the price
Variables
- Roof area required ~30–35 m² of usable roof (south or split E/W)
- DNO export limit 6 kW typically needs G99 paperwork; export-limited to 4 kW if grid weak
- Panel layout Often split arrays on E/W roofs to fit 16 panels
Return on investment
Payback model
Annual savings and payback by tariff combination. Modelled against typical UK consumption profile.
| Setup | Annual saving | Payback |
|---|---|---|
| No battery, Flux export 24p peak | £780 | 13 years |
| + Tesla Powerwall, Flux | £1,580 | 11 years |
Common questions
FAQs
Do I need 6 kW for my home?
If you have an EV charging at home, a heat pump, or use 5,000+ kWh/year, 6 kW is the right size. Otherwise 4 kW with battery is more cost-efficient.
Will I need DNO upgrade for 6 kW?
Often yes — G99 paperwork, sometimes export limitation if your local grid is constrained. We submit and manage the application.
Related guides
Compare other systems
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Where to go next
- For whole-home backup, Tesla Powerwall installation.
- Large roof on a farm or agricultural building? agricultural solar.
- Running an array across a commercial roof? commercial solar O&M.
- On the commercial side, commercial solar PV.
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