Postcode-Specific Solar Analysis
Unlike the free calculator which uses UK averages, Pro uses your exact postcode's sunshine hours — the single biggest factor in how fast your system pays back.
Precise sunshine hours from UK historical weather data (30-year average)
Typical UK roof: 40–60m²
South-facing roofs generate the most solar energy in the UK
Ofgem cap: 24.67p (Q2 2026, down from 27.69p) | Octopus Agile: varies by region
Select your supplier's export tariff — or enter a custom rate
Battery Storage ROI Analysis
See how batteries save money through time-shifting: charge at cheap overnight rates, use during expensive peak times.
Octopus Go: 7p | Intelligent Octopus Go: 5.5p | Economy 7: varies by region
Your daytime electricity rate
Compare Different System Sizes
Based on your roof and usage, here's how different systems compare:
Please complete the Advanced Calculator first to see system comparisons based on your specific location and usage patterns.
Month-by-Month Analysis
Year 1 generation and savings by month.
| Month | Generation (kWh) | Self-Use | Export | Savings |
|---|---|---|---|---|
| Please complete the Advanced Calculator first to see your monthly breakdown. | ||||
Download Your Investment Analysis
Get a detailed breakdown of your solar investment with all calculations and recommendations.