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Solar panel cost in Isles of Scilly (TR23)

See realistic solar installation costs, savings and payback for TR23 (Isles of Scilly) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

Solar Calculator

Change the settings below to see how costs and savings work for your situation.

System Size

Roof Direction

Battery Storage

Export Value

Your Numbers

Break-even
8.9 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,094
What you save every year
Profit Over 25 Years
£17,572
After paying itself off, you're this much ahead

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How we calculate this

Solar generation: Based on typical south-facing roof at 35° angle. We account for weather, dirt, and system losses (14%).

How much you'll use directly:

  • Without battery: You'll use about 40% of what you generate. The rest gets sold back to the grid.
  • With 5 kWh battery: You'll use about 70% (battery stores extra for evening use).
  • With 10 kWh battery: You'll use about 75% (more storage means less exported).
  • Panel-only payback: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • Battery & payback: Batteries raise self-use and cut bills, but added hardware cost often lengthens break-even at typical UK rates.
  • When a battery can still make sense:
    • Evening-heavy usage patterns
    • Time-of-use tariffs / cheap night rates
    • Low export rate vs. high unit rate
    • Heat pump or EV charging synergy
    • Optional backup/resilience (system-dependent)
    • Lower evening-hour CO₂ vs. grid

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £700 per kWh. Export tariffs vary by supplier (usually 5–15p per kWh).

Grid connection: Systems up to about 3.7 kW typically need just a notification (G98). Larger systems may need permission (G99).

These are typical values based on average usage patterns. Your actual results will vary based on your roof, shading, and how you use electricity.

Your area in context

In Southern Western, the current unit rate is 26.39p/kWh with a 57.89p/day standing charge. Your postcode’s south-facing sunshine yield is 1101 kWh/kW — 87 above the regional median (1013).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1101 kWh per year on a south-facing roof. We value self-used electricity at 26.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.4p/kWh
Standing charge
57.9p/day
Sunshine yield (south)
1101 kWh/kW
Export price (baseline)
10p/kWh

Browse the scenarios below. Each battery size has its own expand — open the one that matches your plan (or just explore). For each system size (2–8 kW) we show annual output, how much you use directly, what gets exported, annual benefit, upfront cost, break-even, and a 20-year net. Negative numbers are possible — that’s the honest trade-off when adding more battery than your usage profile justifies.

No battery 5 kW example → Annual benefit: £911, Upfront: £8,139, Break-even: 8.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2202 kWh 881 kWh 1321 kWh £232 £132 £365 £3,256 8.9 yrs £4,035
3 kW 3303 kWh 1321 kWh 1982 kWh £349 £198 £547 £4,883 8.9 yrs £6,052
4 kW 4403 kWh 1761 kWh 2642 kWh £465 £264 £729 £6,511 8.9 yrs £8,069
5 kW 5504 kWh 2202 kWh 3303 kWh £581 £330 £911 £8,139 8.9 yrs £10,087
6 kW 6605 kWh 2642 kWh 3963 kWh £697 £396 £1,094 £9,767 8.9 yrs £12,104
7 kW 7706 kWh 3082 kWh 4624 kWh £813 £462 £1,276 £11,394 8.9 yrs £14,122
8 kW 8807 kWh 3523 kWh 5284 kWh £930 £528 £1,458 £13,022 8.9 yrs £16,139

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £1,092, Upfront: £10,239, Break-even: 9.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2202 kWh 1321 kWh 881 kWh £349 £88 £437 £5,356 12.3 yrs £3,378
3 kW 3303 kWh 1982 kWh 1321 kWh £523 £132 £655 £6,983 10.7 yrs £6,117
4 kW 4403 kWh 2642 kWh 1761 kWh £697 £176 £873 £8,611 9.9 yrs £8,856
5 kW 5504 kWh 3303 kWh 2202 kWh £872 £220 £1,092 £10,239 9.4 yrs £11,595
6 kW 6605 kWh 3963 kWh 2642 kWh £1,046 £264 £1,310 £11,867 9.1 yrs £14,335
7 kW 7706 kWh 4624 kWh 3082 kWh £1,220 £308 £1,528 £13,494 8.8 yrs £17,074
8 kW 8807 kWh 5284 kWh 3523 kWh £1,394 £352 £1,747 £15,122 8.7 yrs £19,813

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,182, Upfront: £11,639, Break-even: 9.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2202 kWh 1541 kWh 661 kWh £407 £66 £473 £6,756 14.3 yrs £2,700
3 kW 3303 kWh 2312 kWh 991 kWh £610 £99 £709 £8,383 11.8 yrs £5,800
4 kW 4403 kWh 3082 kWh 1321 kWh £813 £132 £946 £10,011 10.6 yrs £8,900
5 kW 5504 kWh 3853 kWh 1651 kWh £1,017 £165 £1,182 £11,639 9.8 yrs £12,000
6 kW 6605 kWh 4624 kWh 1982 kWh £1,220 £198 £1,418 £13,267 9.4 yrs £15,100
7 kW 7706 kWh 5394 kWh 2312 kWh £1,424 £231 £1,655 £14,894 9.0 yrs £18,200
8 kW 8807 kWh 6165 kWh 2642 kWh £1,627 £264 £1,891 £16,522 8.7 yrs £21,300

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,209, Upfront: £13,389, Break-even: 11.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2202 kWh 1607 kWh 594 kWh £424 £59 £484 £8,506 17.6 yrs £1,166
3 kW 3303 kWh 2411 kWh 892 kWh £636 £89 £725 £10,133 14.0 yrs £4,375
4 kW 4403 kWh 3214 kWh 1189 kWh £848 £119 £967 £11,761 12.2 yrs £7,583
5 kW 5504 kWh 4018 kWh 1486 kWh £1,060 £149 £1,209 £13,389 11.1 yrs £10,791
6 kW 6605 kWh 4822 kWh 1783 kWh £1,272 £178 £1,451 £15,017 10.4 yrs £13,999
7 kW 7706 kWh 5625 kWh 2081 kWh £1,485 £208 £1,693 £16,644 9.8 yrs £17,207
8 kW 8807 kWh 6429 kWh 2378 kWh £1,697 £238 £1,934 £18,272 9.4 yrs £20,416

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,227, Upfront: £15,139, Break-even: 12.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2202 kWh 1651 kWh 550 kWh £436 £55 £491 £10,256 20.9 yrs £-439
3 kW 3303 kWh 2477 kWh 826 kWh £654 £83 £736 £11,883 16.1 yrs £2,841
4 kW 4403 kWh 3303 kWh 1101 kWh £872 £110 £982 £13,511 13.8 yrs £6,122
5 kW 5504 kWh 4128 kWh 1376 kWh £1,089 £138 £1,227 £15,139 12.3 yrs £9,402
6 kW 6605 kWh 4954 kWh 1651 kWh £1,307 £165 £1,472 £16,767 11.4 yrs £12,682
7 kW 7706 kWh 5779 kWh 1926 kWh £1,525 £193 £1,718 £18,394 10.7 yrs £15,963
8 kW 8807 kWh 6605 kWh 2202 kWh £1,743 £220 £1,963 £20,022 10.2 yrs £19,243

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,245, Upfront: £17,589, Break-even: 14.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2202 kWh 1695 kWh 506 kWh £447 £51 £498 £12,706 25.5 yrs £-2,745
3 kW 3303 kWh 2543 kWh 760 kWh £671 £76 £747 £14,333 19.2 yrs £608
4 kW 4403 kWh 3391 kWh 1013 kWh £895 £101 £996 £15,961 16.0 yrs £3,960
5 kW 5504 kWh 4238 kWh 1266 kWh £1,118 £127 £1,245 £17,589 14.1 yrs £7,313
6 kW 6605 kWh 5086 kWh 1519 kWh £1,342 £152 £1,494 £19,217 12.9 yrs £10,665
7 kW 7706 kWh 5934 kWh 1772 kWh £1,566 £177 £1,743 £20,844 12.0 yrs £14,018
8 kW 8807 kWh 6781 kWh 2026 kWh £1,790 £203 £1,992 £22,472 11.3 yrs £17,370

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

Figures are illustrative and use the same method as the calculator above. For exact results, adjust your roof direction, tariff, and usage in the calculator.

Before you request quotes in Isles of Scilly

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Understand DNO, G98 and G99 export limits

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Insights for TR23

Figures below are tailored to TR23 — click through for full league tables.

Big-Roof Britain Rank #230 of 2182
6.1 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #80 of 2996
8.9 years (UK avg 10.8 years)
~£1,094 /yr • £9,767 upfront
Standing-Charge Drag Rank #365 of 2996
19.3% (UK avg 26.6%) drag on savings
£211 fixed • ~£1,094 /yr value
Aspect Penalty View ranking →
East −19.8% West −22.3%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in TR23

Monthly generation per kilowatt of solar panels

kWh 38 Jan 57 Feb 90 Mar 128 Apr 137 May 136 Jun 134 Jul 126 Aug 102 Sep 73 Oct 45 Nov 33 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 46.8% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 43 kWh per month; the average month produces around 92 kWh. So a typical 4 kW home system would generate roughly 172 kWh in winter, or 367 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.39p/kWh
Daily Fixed Charge
57.89p/day
Local Sunshine
1101kWh/kW
A 1 kW system generates ~1101 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 70% • Flats: 10% • Bungalows: 20% Based on 20 properties

Coverage

Isles of Scilly (100%)

Areas Covered

Bryher

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

Property data: EPC open data (Open Government Licence), aggregated

All estimates are typical values. Actual results vary based on your specific situation, roof characteristics, and usage patterns.

Compare nearby areas

Nearby in Southern Western

TR24 (Isles of Scilly)
≈1.1 km away
Local sunshine: ~1,096 kWh/kWp · -0% vs TR23
TR25 (Isles of Scilly)
≈4.6 km away
Local sunshine: ~1,092 kWh/kWp · -1% vs TR23
TR21 (Isles of Scilly)
≈5.3 km away
Local sunshine: ~1,066 kWh/kWp · -3% vs TR23
TR22 (Isles of Scilly)
≈6.7 km away
Local sunshine: ~1,099 kWh/kWp · -0% vs TR23
TR19 (Cornwall)
≈52.1 km away
Local sunshine: ~1,083 kWh/kWp · -2% vs TR23
TR18 (Cornwall)
≈60.9 km away
Local sunshine: ~1,066 kWh/kWp · -3% vs TR23

Similar sunshine across the UK

PO41 (Isle of Wight)
~1,101 kWh/kWp · +0% vs TR23
CO16 (Tendring)
~1,101 kWh/kWp · +0% vs TR23
CT13 (Dover)
~1,100 kWh/kWp · -0% vs TR23