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Solar panel cost in Cornwall (TR14)

See realistic solar installation costs, savings and payback for TR14 (Cornwall) 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
9.8 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£834
What you save every year
Profit Over 25 Years
£12,712
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 1008 kWh/kW — 6 below the regional median (1013).

Read the full story

A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1008 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)
1008 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: £834, Upfront: £8,139, 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 2015 kWh 806 kWh 1209 kWh £213 £121 £334 £3,256 9.8 yrs £3,417
3 kW 3023 kWh 1209 kWh 1814 kWh £319 £181 £500 £4,883 9.8 yrs £5,125
4 kW 4030 kWh 1612 kWh 2418 kWh £425 £242 £667 £6,511 9.8 yrs £6,834
5 kW 5038 kWh 2015 kWh 3023 kWh £532 £302 £834 £8,139 9.8 yrs £8,542
6 kW 6045 kWh 2418 kWh 3627 kWh £638 £363 £1,001 £9,767 9.8 yrs £10,251
7 kW 7053 kWh 2821 kWh 4232 kWh £744 £423 £1,168 £11,394 9.8 yrs £11,959
8 kW 8060 kWh 3224 kWh 4836 kWh £851 £484 £1,334 £13,022 9.8 yrs £13,668

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: £999, Upfront: £10,239, Break-even: 10.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2015 kWh 1209 kWh 806 kWh £319 £81 £400 £5,356 13.4 yrs £2,638
3 kW 3023 kWh 1814 kWh 1209 kWh £479 £121 £600 £6,983 11.6 yrs £5,007
4 kW 4030 kWh 2418 kWh 1612 kWh £638 £161 £799 £8,611 10.8 yrs £7,376
5 kW 5038 kWh 3023 kWh 2015 kWh £798 £202 £999 £10,239 10.2 yrs £9,745
6 kW 6045 kWh 3627 kWh 2418 kWh £957 £242 £1,199 £11,867 9.9 yrs £12,114
7 kW 7053 kWh 4232 kWh 2821 kWh £1,117 £282 £1,399 £13,494 9.6 yrs £14,483
8 kW 8060 kWh 4836 kWh 3224 kWh £1,276 £322 £1,599 £15,122 9.5 yrs £16,852

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: £1,082, Upfront: £11,639, Break-even: 10.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2015 kWh 1411 kWh 605 kWh £372 £60 £433 £6,756 15.6 yrs £1,899
3 kW 3023 kWh 2116 kWh 907 kWh £558 £91 £649 £8,383 12.9 yrs £4,598
4 kW 4030 kWh 2821 kWh 1209 kWh £744 £121 £865 £10,011 11.6 yrs £7,297
5 kW 5038 kWh 3526 kWh 1511 kWh £931 £151 £1,082 £11,639 10.8 yrs £9,996
6 kW 6045 kWh 4232 kWh 1814 kWh £1,117 £181 £1,298 £13,267 10.2 yrs £12,696
7 kW 7053 kWh 4937 kWh 2116 kWh £1,303 £212 £1,514 £14,894 9.8 yrs £15,395
8 kW 8060 kWh 5642 kWh 2418 kWh £1,489 £242 £1,731 £16,522 9.5 yrs £18,094

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: £1,107, Upfront: £13,389, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2015 kWh 1471 kWh 544 kWh £388 £54 £443 £8,506 19.2 yrs £347
3 kW 3023 kWh 2207 kWh 816 kWh £582 £82 £664 £10,133 15.3 yrs £3,145
4 kW 4030 kWh 2942 kWh 1088 kWh £776 £109 £885 £11,761 13.3 yrs £5,943
5 kW 5038 kWh 3678 kWh 1360 kWh £971 £136 £1,107 £13,389 12.1 yrs £8,742
6 kW 6045 kWh 4413 kWh 1632 kWh £1,165 £163 £1,328 £15,017 11.3 yrs £11,540
7 kW 7053 kWh 5149 kWh 1904 kWh £1,359 £190 £1,549 £16,644 10.7 yrs £14,338
8 kW 8060 kWh 5884 kWh 2176 kWh £1,553 £218 £1,770 £18,272 10.3 yrs £17,137

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: £1,123, Upfront: £15,139, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2015 kWh 1511 kWh 504 kWh £399 £50 £449 £10,256 22.8 yrs £-1,271
3 kW 3023 kWh 2267 kWh 756 kWh £598 £76 £674 £11,883 17.6 yrs £1,593
4 kW 4030 kWh 3023 kWh 1008 kWh £798 £101 £898 £13,511 15.0 yrs £4,458
5 kW 5038 kWh 3778 kWh 1259 kWh £997 £126 £1,123 £15,139 13.5 yrs £7,322
6 kW 6045 kWh 4534 kWh 1511 kWh £1,197 £151 £1,348 £16,767 12.4 yrs £10,186
7 kW 7053 kWh 5290 kWh 1763 kWh £1,396 £176 £1,572 £18,394 11.7 yrs £13,051
8 kW 8060 kWh 6045 kWh 2015 kWh £1,595 £202 £1,797 £20,022 11.1 yrs £15,915

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: £1,140, Upfront: £17,589, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2015 kWh 1552 kWh 463 kWh £409 £46 £456 £12,706 27.9 yrs £-3,589
3 kW 3023 kWh 2327 kWh 695 kWh £614 £70 £684 £14,333 21.0 yrs £-659
4 kW 4030 kWh 3103 kWh 927 kWh £819 £93 £912 £15,961 17.5 yrs £2,272
5 kW 5038 kWh 3879 kWh 1159 kWh £1,024 £116 £1,140 £17,589 15.4 yrs £5,202
6 kW 6045 kWh 4655 kWh 1390 kWh £1,228 £139 £1,367 £19,217 14.1 yrs £8,133
7 kW 7053 kWh 5431 kWh 1622 kWh £1,433 £162 £1,595 £20,844 13.1 yrs £11,063
8 kW 8060 kWh 6207 kWh 1854 kWh £1,638 £185 £1,823 £22,472 12.3 yrs £13,994

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 Cornwall

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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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

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Insights for TR14

Figures below are tailored to TR14 — click through for full league tables.

Big-Roof Britain Rank #1468 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #737 of 2996
9.8 years (UK avg 10.8 years)
~£834 /yr • £8,139 upfront
Standing-Charge Drag Rank #1477 of 2996
25.3% (UK avg 26.6%) drag on savings
£211 fixed • ~£834 /yr value
Aspect Penalty View ranking →
East −18.6% West −19.6%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in TR14

Monthly generation per kilowatt of solar panels

kWh 38 Jan 55 Feb 87 Mar 118 Apr 124 May 123 Jun 120 Jul 113 Aug 92 Sep 65 Oct 42 Nov 31 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.1% 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 41 kWh per month; the average month produces around 84 kWh. So a typical 4 kW home system would generate roughly 165 kWh in winter, or 336 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.39p/kWh
Daily Fixed Charge
57.89p/day
Local Sunshine
1008kWh/kW
A 1 kW system generates ~1008 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 66% • Flats: 17% • Bungalows: 16% Based on 7,992 properties

Coverage

Cornwall (100%)

Areas Covered

Camborne Trelowarren, Camborne Roskear & Tuckingmill, Camborne West & Treswithian, Four Lanes, Beacon & Troon, Crowan, Sithney & Wendron, Pool & Tehidy + 2 more

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

TR15 (Cornwall)
≈5.2 km away
Local sunshine: ~1,012 kWh/kWp · +0% vs TR14
TR16 (Cornwall)
≈6.1 km away
Local sunshine: ~1,013 kWh/kWp · +1% vs TR14
TR27 (Cornwall)
≈8.9 km away
Local sunshine: ~1,067 kWh/kWp · +6% vs TR14
TR13 (Cornwall)
≈12.4 km away
Local sunshine: ~1,082 kWh/kWp · +7% vs TR14
TR5 (Cornwall)
≈12.8 km away
Local sunshine: ~1,025 kWh/kWp · +2% vs TR14
TR3 (Cornwall)
≈13.1 km away
Local sunshine: ~1,038 kWh/kWp · +3% vs TR14

Similar sunshine across the UK

RG24 (Basingstoke and Deane)
~1,007 kWh/kWp · -0% vs TR14
IG10 (Epping Forest)
~1,007 kWh/kWp · -0% vs TR14
IG7 (Epping Forest)
~1,008 kWh/kWp · +0% vs TR14