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Tools
Solar Calculator
A first-pass estimate of what a roof-mounted system could generate and save. Change the inputs to see how sensitive the answer is.
Inputs
Your system
Roughly 2.5 panels per kWp, and about 5 m² of roof per kWp.
Result
Your indicative solar assessment
Modelled from the inputs on this page. Indicative only — not a quotation, performance guarantee or system recommendation.
Indicative system size4.0 kWp
- Annual generation
- 3,420 kWh
- Used on site
- 1,368 kWh
- Exported
- 2,052 kWh
- Bill saving
- £356
- Export income
- £308
- CO₂ avoided
- 0.71 t
Assumptions and caveats
Estimates assume roughly 900 kWh per kWp per year for the East Midlands and 40% of generation used on site without a battery. Real performance depends on the specific roof, shading, tariff and occupancy. Savings, export income and payback are not guaranteed.
Recommended next action
A survey is needed to confirm roof condition, shading, structure and metering before any system can be recommended. Installation work is delivered by our network of MCS-certified installation partners.
Turn an estimate into a proposal
A survey replaces every assumption above with a measured value.