How Much Does a Commercial Solar Installation Cost?
Every Business Has Different Energy Requirements
Commercial solar PV systems are not one-size-fits-all.
The size, design, and cost of a system will depend on factors such as:
- annual electricity consumption
- available roof space or land
- building structure
- operating hours
- export capability
- whether battery storage is included
A well-designed system should match the energy profile of the business rather than simply maximise panel numbers.
What Affects the Cost of Commercial Solar?
Several factors influence the final installation cost, including:
- system size
- roof access and working conditions
- structural requirements
- inverter specification
- cable routes and electrical infrastructure
- DNO connection requirements
- battery storage integration
- monitoring and control systems
Because every site is different, commercial solar projects are usually designed individually following a site survey and energy assessment.
Typical Commercial Solar System Costs
The figures below provide a general guide to common commercial rooftop solar PV system sizes and approximate installation costs.
| System Size | Estimated Cost* |
|---|---|
| 50 kW | Approximately £45,000 |
| 100 kW | Approximately £70,000 |
| 250 kW | Approximately £165,000 |
| 500 kW | Approximately £300,000 |
*Estimated costs only. Final pricing will vary depending on site-specific requirements, equipment selection, and project complexity.
Battery Storage Can Change the Overall System Cost
Adding battery storage will increase the initial project cost but may improve the overall value of the installation in certain situations.
Battery systems can help businesses:
- increase solar self-consumption
- reduce peak electricity costs
- optimise time-of-use tariffs
- improve energy resilience
- manage export limitations
The financial benefit will depend on how the business uses electricity throughout the day.
Commercial Solar Is a Long-Term Investment
For many businesses, the main financial benefit comes from reducing imported electricity over the long term.
Depending on energy usage patterns, businesses may also benefit from:
- export payments
- business rates relief
- capital allowances
- protection against rising electricity costs
Payback periods vary between sites, but commercial solar is increasingly viewed as part of a wider energy management strategy rather than simply an equipment purchase.
Get a Tailored Assessment
The most accurate way to understand potential costs and savings is through a professional site assessment and energy review.
The Stag Solar team can assess your building, electricity usage, and operational requirements to recommend a system designed around your business.