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Solar Panel Savings Calculator

Calculate the cost, savings, and payback period for installing solar panels on your roof. Compare different system sizes.

Solar Panel Savings Calculator

South-facing is optimal

30 degrees is ideal for UK

Typical domestic system

Current cap rate: 24.5p

SEG rates: typically 12-20p

For reference only

Annual Generation

5500

kWh/year

Annual Benefit

£1060.13

savings + exports

System Cost

£10000.00

before grants

Payback Period

4.7

years

Annual Generation

Total Generation5500 kWh
Self-Consumed2475 kWh
Exported to Grid3025 kWh

Performance factor: 100%

Based on direction and angle

Annual Income

Self-Consumption Savings£606.38
Export Income (SEG)£453.75
Total Benefit£1060.13

Investment & Payback

System Installation Cost

£10000.00

Potential Grant/Loan

£5000.00

Net Cost

£5000.00

Payback: 4.7 years

25-Year Cumulative Return

Year 0p0.0
Year 1p-893987.5
Year 2p-787975.0
Year 3p-681962.5
Year 4p-575950.0
Year 5p-469937.5
Year 6p-363925.0
Year 7p-257912.5
Year 8p-151900.0
Year 9p-45887.5
Year 10+£601.25
Year 11+£1661.38
Year 12+£2721.50
Year 13+£3781.63
Year 14+£4841.75
Year 15+£5901.88
Year 16+£6962.00
Year 17+£8022.13
Year 18+£9082.25
Year 19+£10142.38
Year 20+£11202.50
Year 21+£12262.63
Year 22+£13322.75
Year 23+£14382.88
Year 24+£15443.00
Year 25+£16503.13

After 25 years, your solar system will have saved you approximately £26503.13

Solar Panel Benefits

  • Annual savings of £1060.13 from day one
  • Generate 5.5 MWh clean electricity per year
  • Payback in 4.7 years
  • 25-year lifespan with minimal maintenance
  • Export excess power to grid via Smart Export Guarantee (SEG)
  • Reduce carbon footprint by ~4 tonnes per year
  • Increase home value (typically adds 3-4% to property value)
  • Protection against rising electricity prices

💡 Optimization Tips

  • Combine with battery storage to increase self-consumption rate
  • Time high-consumption activities (laundry, dishwasher) for midday solar peak
  • Install smart meter to track generation and consumption
  • Pair with heat pump for cheaper winter heating
  • Clean panels annually for optimal output
  • Get multiple quotes from MCS-accredited installers
  • Check your feed-in tariff options (SEG rates vary by provider)

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