How Much Do 100kW Commercial Solar Panels Cost in the UK?
Complete cost guide for 100kW commercial solar systems. Pricing, returns, and considerations for larger installations.

100kW systems suit larger businesses with significant electricity consumption. This guide covers costs, returns, and considerations.
100kW System Costs
A 100kW commercial solar installation typically costs 85,000-110,000, benefiting from economies of scale compared to smaller systems.
What 100kW Includes
- Panels: 240-270 solar panels
- Inverters: 2-4 string inverters
- Mounting: Extensive roof mounting system
- Electrical: Upgraded electrical infrastructure
- DNO: May require G99 application
Expected Returns
A 100kW system generates 85,000-95,000 kWh annually, worth 29,000-35,000 at current prices. Payback typically occurs in 3-3.5 years.
Grid Connection
100kW systems require a G99 application to the DNO, which can add 4-8 weeks to the project timeline. We handle this process entirely.
Ideal For
100kW suits large warehouses, factories, distribution centres, and industrial facilities with roof space of 600+ square metres.