Commercial solar · 150 kWp
150 kWp commercial solar system — cost, size and payback (UK)
A 150 kWp system is a common size for UK mid-large industrial units, food-production sites, and multi-branch retail. It suits businesses using 200,000–280,000 kWh a year and fits on 15,000–22,000 sq ft of usable roof.
150 kWp at a glance
System size
150 kWp
Panels
~300 panels (500 W each)
Roof area
15,000–22,000 sq ft (~1,400–2,050 m²)
Annual generation
~142 MWh/year (142,000 kWh)
Installed cost
£115,000–£135,000 installed
After Full Expensing
£86,250–£101,250 after Full Expensing
Annual saving
£27,000–£36,000/year
Payback
3.5–5 years after Full Expensing
Best fit business types
- Mid-size distribution centres
- Food and drink production sites
- Multi-branch retail with central roof
- Larger schools and academies
- Large hotels and holiday parks
Design and spec notes
- Typically 3–5 string inverters with individual G99 applications, or one central inverter.
- Battery storage (150–300 kWh) commonly added for peak-shaving.
- DNO connection headroom check is essential — 150 kWp is where connection capacity issues start to bite.
Related reading
FAQ — 150 kWp systems
Does 150 kWp need a special grid connection?
Sometimes. In areas with constrained networks (East Midlands, parts of London), 150 kWp+ can require G100 export limitation or a network reinforcement. Ask the DNO early.
Is 150 kWp worth it over 100 kWp?
Yes if your annual demand is above ~200,000 kWh. Below that, self-consumption drops and payback lengthens.
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