Commercial solar · 250 kWp
250 kWp commercial solar system — cost, size and payback (UK)
A 250 kWp system is a common commercial standard for UK distribution centres, factories, cold-storage units and university buildings. It typically covers a 25,000–35,000 sq ft roof and delivers strong economies of scale on £/kWp.
250 kWp at a glance
System size
250 kWp
Panels
~500 panels (500 W each)
Roof area
25,000–35,000 sq ft (~2,320–3,250 m²)
Annual generation
~237 MWh/year (237,000 kWh)
Installed cost
£180,000–£220,000 installed
After Full Expensing
£135,000–£165,000 after Full Expensing
Annual saving
£45,000–£60,000/year
Payback
3.5–5 years after Full Expensing
Best fit business types
- Standard-format distribution centres (30–50k sq ft)
- Mid-size factories and process plants
- Cold-storage and food processing
- University estates and hospital annexes
- Multi-tenant industrial estates (landlord-led)
Design and spec notes
- Usually 2–3 central inverters, single G99 DNO application.
- PPA funding well-suited at this size — attractive to funders.
- Battery pairing (250–500 kWh) common for cold-storage and 24/7 operations.
- String monitoring per row is standard for early fault detection.
Related reading
FAQ — 250 kWp systems
How long does 250 kWp take to install?
Typically 4–6 weeks on-site, plus 3–4 months upfront for DNO approval and design.
Can a business afford 250 kWp without upfront capex?
Yes — 250 kWp is prime PPA territory. Zero upfront cost, funder-owned, you buy power at a 25–35% discount to grid.
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