50 kWp commercial solar system — cost, size and payback (UK)
A 50 kWp system is the sweet spot for small UK businesses — single-unit industrial workshops, small retail stores, dental and medical practices, small hotels, and one-branch offices. It fits comfortably on a 5,000–7,500 sq ft roof and covers most daytime electricity demand for a business using ~60,000–90,000 kWh a year.
50 kWp at a glance
Best fit business types
- Small workshops and light industrial units
- Dental practices, vet practices, GP surgeries
- Small retail stores and convenience supermarkets
- Small hotels and guest houses
- Single-branch offices
Design and spec notes
- Single-inverter setup with G99 fast-track approval (under 3.68 kW per phase per inverter).
- No planning application required for rooftop under Permitted Development.
- Roof structural survey confirms 15–20 kg/m² dead-load capacity — standard for post-2000 metal roofs.
- Optional battery: 30–50 kWh, £8,000–£20,000 additional capex.
Related reading
FAQ — 50 kWp systems
How many panels are in a 50 kWp system?
Approximately 100 panels at 500 W each, or 90 panels at 550 W. Requires around 250 m² of usable roof space.
Is 50 kWp too big for a small business?
A 50 kWp system suits businesses using 60,000+ kWh a year. For lower consumption, size down to 25–30 kWp to keep self-consumption high and payback under 5 years.
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