Commercial Solar ROI Calculator
Estimate your solar panel payback period and return on investment.
Use this calculator to get an indicative estimate of your commercial solar investment returns. For an accurate assessment based on your specific site, roof orientation, and energy usage patterns, request a free site survey.
Calculator Assumptions
- Annual yield: 900 kWh per kWp (UK average for well-oriented systems)
- Panel degradation: 0.5% per year
- Maintenance: £200 per year
- System life: 25 years (panels warranted for 25 years)
- VAT: Not included (businesses can reclaim)
Note: This is an indicative estimate only. Actual returns depend on roof orientation, shading, your specific usage patterns, and installation costs. Contact us for a detailed assessment.
Understanding Solar ROI
Key Factors Affecting Returns
Self-Consumption Rate
The more solar electricity you use directly, the better your returns. Exported electricity earns less than the savings from avoided imports.
- Manufacturing/24-7 operations: 70-90%
- Warehouses with cold storage: 60-80%
- Offices (daytime): 50-70%
- Schools (term-time): 40-60%
Electricity Prices
Higher electricity prices mean faster payback. With prices volatile, solar provides a hedge against future increases.
- Average commercial rate: 25-35p/kWh
- High users may pay: 20-25p/kWh
- Small businesses: 30-40p/kWh
- Historical trend: 5-7% annual increase
Improving Your ROI
- Add battery storage: Increases self-consumption by storing excess for evening use
- Shift loads: Run heavy equipment during peak generation hours
- EV charging: Use solar to charge fleet or staff vehicles
- Smart energy management: Automate to maximise solar utilisation
Get an Accurate Assessment
This calculator provides estimates based on average assumptions. For accurate figures for your specific situation, we recommend a free site survey where we:
- Assess your roof orientation, pitch, and shading
- Review your electricity bills and usage patterns
- Calculate optimal system size for your needs
- Provide detailed financial projections
- Identify any applicable grants or incentives
- Deliver a fixed-price quotation
Site surveys are free with no obligation. We cover Bedfordshire, Hertfordshire, and Buckinghamshire.
Ready for an Accurate Quote?
Get a detailed assessment based on your specific site and energy usage.
Request Site survey Call 07944 275171