50kW Solar System Cost UK — 2026 Price Breakdown
A 50kW commercial solar system costs £44,000 to £53,000 fully installed in 2026 — around £880–£1,060 per kWp. It is the workhorse size for SMEs: big enough for real per-kWp savings over 30kW, small enough to avoid heavyweight grid engineering.
The 2026 cost picture at 50kW
Fifty kilowatts sits at a sweet spot in the commercial pricing curve. The scaffold, design work and G99 application cost barely more than they do for a 30kW project, but they are now spread across 110 panels instead of 66. That is why the per-kWp rate drops by a meaningful step even though the kit is the same.
| Component | Typical 2026 range |
|---|---|
| Panels (~110 × 450W, tier-1) | £11,000–£14,000 |
| Inverters (2 × 25kW or 1 × 50kW) and protection | £3,500–£5,500 |
| Mounting system | £4,000–£5,500 |
| Electrical installation and cabling | £9,000–£12,000 |
| Scaffolding / powered access | £3,500–£6,000 |
| Design, G99 application, structural check, commissioning | £3,500–£5,000 |
| Monitoring and handover documentation | £1,200–£1,800 |
Who installs 50kW systems
Typical 50kW buyers are engineering firms with machine shops, food retailers with refrigeration running around the clock, dairy and poultry farms, mid-size offices, vehicle workshops and care homes. The financial profile that works: an annual electricity spend of £15,000–£30,000 and a building occupied through daylight hours. Care homes and refrigeration-led businesses do particularly well at this size because their seven-day load soaks up weekend generation that a five-day factory would export.
Worked example: care home, North West
A 60-bed care home installs 50kW across two roof pitches at £47,800. Yield models at 44,200 kWh per year. Because the building never sleeps, self-consumption reaches 88% — displacing 38,900 kWh of grid power at 27p/kWh, worth £10,500 a year, plus around £450 of export. The operator claims the full cost against the Annual Investment Allowance in year one, reducing corporation tax by roughly £11,900 at the 25% main rate. Effective net cost: about £35,900. Simple payback on the net figure: well under four years.
Grid connection at 50kW
A 50kW system on a healthy three-phase supply is normally a straightforward G99 application, but two things can complicate it. First, rural sites at the end of long 11kV spurs may face export limits — solvable with an export limitation device, which slightly trims revenue but keeps the project moving. Second, sites with existing large loads (EV chargers, heat pumps) may be close to their agreed supply capacity, and the DNO will assess the whole picture. Neither is a deal-breaker; both are reasons to start the DNO conversation before signing anything.
If your roof could take more than 110 panels and your bills support it, read the 100kW cost guide next — the per-kWp saving for going bigger is substantial. And before comparing quotes, check the nine price factors so you can see exactly why two 50kW quotes might be £8,000 apart.
50kW solar system — common questions
How much roof space does a 50kW system need?
Roughly 220–250 square metres of usable, unshaded roof for around 110 panels at 450W. On a portal-frame industrial unit that is typically a roof of about 15m × 30m, allowing for edge zones, rooflights and walkways.
Why do some installers quote 49.9kW rather than 50kW?
Some DNO processes treat sub-50kW connections more simply, and certain legacy support schemes used 50kW as a threshold, so 49.9kW inverter configurations became a habit in the industry. In 2026 there is no strong financial reason to stay under 50kW — size the system to your load and roof, not to an arbitrary line.
What will a 50kW solar system save a UK business?
Annual yield is typically 42,500–47,500 kWh. A business consuming 75–85% of that on-site at 25–27p/kWh saves £8,500–£10,500 a year at 2026 prices, with export income on top. Against a mid-band install cost of £48,000 that is a 5–6 year simple payback, or faster after year-one tax relief.
Is battery storage worth adding to a 50kW system?
Only if your load profile justifies it. A site with heavy evening or weekend use that would otherwise export 40%+ of generation can improve returns with 30–60kWh of storage, which adds roughly £15,000–£25,000 installed. A weekday-daytime business already using most of its generation usually gets better returns from putting that capital into more panels.