SolarSolar Panels in TR21 Isles Of Scilly
Cornwall • South West • 1410 sun hours/year
Homes in TR21 save an average of
with solar panels • 9-year payback
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Solar Panel Potential in Isles Of Scilly (TR21)
Postcode district TR21 receives approximately 1410 hours of sunshine per year, making it an above-average location for solar panels in the UK. A typical 4kW system here generates around 3,948 kWh of electricity annually.
Of this, roughly half (1,974 kWh) is used directly in your home, saving you £482 on electricity bills at the current rate of 24.4p/kWh. The remaining 1,974 kWh is exported to the grid under the Smart Export Guarantee, earning you an additional £237 per year at 12p/kWh.
Solar Panel Costs in TR21
The average cost of a 4kW solar panel system in the South West region is approximately £6,500. This includes panels, inverter, mounting, and installation by an MCS-certified installer. Prices have fallen over 60% in the last decade, and 0% VAT currently applies.
At £719 annual savings, the system pays for itself in 9 years, then generates profit for a further 16 years — a total 25-year return of £10,426.
Year-by-Year Savings Breakdown
Payback Timeline
| Year | Generation (kWh) | Annual Savings | Cumulative |
|---|---|---|---|
| 1 | 3,948 | £719 | £-5,781 |
| 2 | 3,928 | £715 | £-5,066 |
| 3 | 3,909 | £712 | £-4,354 |
| 4 | 3,889 | £707 | £-3,647 |
| 5 | 3,870 | £704 | £-2,943 |
| 6 | 3,850 | £701 | £-2,242 |
| 7 | 3,831 | £697 | £-1,545 |
| 8 | 3,812 | £694 | £-851 |
| 9 | 3,793 | £691 | £-160 |
| 10 | 3,774 | £686 | +£526 |
| 11 | 3,755 | £683 | +£1,209 |
| 12 | 3,736 | £680 | +£1,889 |
| 13 | 3,718 | £677 | +£2,566 |
| 14 | 3,699 | £673 | +£3,239 |
| 15 | 3,680 | £670 | +£3,909 |
| 16 | 3,662 | £667 | +£4,576 |
| 17 | 3,644 | £664 | +£5,240 |
| 18 | 3,626 | £660 | +£5,900 |
| 19 | 3,607 | £656 | +£6,556 |
| 20 | 3,589 | £653 | +£7,209 |
| 21 | 3,571 | £650 | +£7,859 |
| 22 | 3,554 | £647 | +£8,506 |
| 23 | 3,536 | £643 | +£9,149 |
| 24 | 3,518 | £640 | +£9,789 |
| 25 | 3,501 | £637 | +£10,426 |
How TR21 Compares to the UK Average
Nearby Areas Compared
| Area | Sun Hours | Annual Savings | Payback |
|---|---|---|---|
| TR21 Isles Of Scilly | 1410hrs | £719/yr | 9 yrs |
| TR20 Penzance | 1409hrs | £718/yr | 9.1 yrs |
Battery Storage in TR21
With 3,948 kWh of annual generation, adding a battery could increase your self-consumption from 50% to 80%, boosting annual savings significantly.
Is battery storage worth it in TR21? →Get 3 Free Solar Quotes in Isles Of Scilly
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How We Calculated These Figures
Our estimates are based on 1410 annual sun hours for the South West region, a standard 4kW system with south-facing orientation, and 50% self-consumption ratio. Electricity savings use the current average tariff of 24.4p/kWh, and export income uses the Smart Export Guarantee average of 12p/kWh. Panel degradation of 0.5% per year is factored into 25-year projections.
Actual savings will vary based on your roof orientation, shading, energy usage patterns, chosen system size, and installer pricing. We recommend getting at least 3 quotes from MCS-certified installers for accurate pricing.
Nearby Areas
Frequently Asked Questions
How much can I save with solar panels in TR21?
Homes in TR21 Isles Of Scilly save an average of £719 per year with a typical 4kW solar panel system. This is based on 1410 annual sun hours, generating 3,948 kWh of electricity. Over 25 years, the total profit after system costs is £10,426.
What is the payback period for solar panels in TR21?
The average payback period for a 4kW solar panel system in TR21 is 9 years. After that, you enjoy 16 or more years of pure profit from reduced electricity bills and Smart Export Guarantee payments.
How many solar panels do I need for a home in TR21?
A typical 4kW system uses 10-12 solar panels (depending on panel wattage, typically 350-400W each). This suits most 3-4 bedroom homes. For exact sizing, get a quote from an MCS-certified installer who will assess your roof space and orientation.
Is solar worth it in TR21 Isles Of Scilly?
Yes. With 1410 sun hours per year (£35 above the UK average savings), TR21 is an above-average location for solar. A 4kW system costs approximately £6,500 and pays for itself in 9 years, then generates profit for 15+ more years.
What grants are available for solar panels in TR21?
Solar panels in the UK currently benefit from 0% VAT (until at least 2027), reducing upfront costs. You may also be eligible for the ECO4 scheme if you receive certain benefits. The Smart Export Guarantee pays you for electricity you export to the grid — the average rate in your area is 12p/kWh.
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