Independent solar numbers for your postcode using official UK data
Home Regions Guides Compare quotes Solar assistant
Insights
Big Roof Britain Solar Payback Index Standing Charge Drag Roof Direction Penalty Winter Solar Reality Seasonal Solar Output

Solar panel cost in Cornwall (TR11)

See realistic solar installation costs, savings and payback for TR11 (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
9.6 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£846
What you save every year
Profit Over 25 Years
£13,001
After paying itself off, you're this much ahead

Ready to Get Started?

Get your free quote from Blue Ape Renewables. They'll connect you with MCS-certified installers in your area and handle all the paperwork.

Get Solar Quote →
4.8★ Trustpilot • Octopus Energy trusted partner • MCS certified • No obligation
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 1021 kWh/kW — 8 above 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 1021 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)
1021 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: £846, Upfront: £8,139, Break-even: 9.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2043 kWh 817 kWh 1226 kWh £216 £123 £338 £3,256 9.6 yrs £3,509
3 kW 3064 kWh 1226 kWh 1839 kWh £323 £184 £507 £4,883 9.6 yrs £5,264
4 kW 4086 kWh 1634 kWh 2452 kWh £431 £245 £676 £6,511 9.6 yrs £7,018
5 kW 5107 kWh 2043 kWh 3064 kWh £539 £306 £846 £8,139 9.6 yrs £8,773
6 kW 6129 kWh 2452 kWh 3677 kWh £647 £368 £1,015 £9,767 9.6 yrs £10,527
7 kW 7150 kWh 2860 kWh 4290 kWh £755 £429 £1,184 £11,394 9.6 yrs £12,282
8 kW 8172 kWh 3269 kWh 4903 kWh £863 £490 £1,353 £13,022 9.6 yrs £14,036

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: £1,013, Upfront: £10,239, Break-even: 10.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2043 kWh 1226 kWh 817 kWh £323 £82 £405 £5,356 13.2 yrs £2,748
3 kW 3064 kWh 1839 kWh 1226 kWh £485 £123 £608 £6,983 11.5 yrs £5,173
4 kW 4086 kWh 2452 kWh 1634 kWh £647 £163 £810 £8,611 10.6 yrs £7,597
5 kW 5107 kWh 3064 kWh 2043 kWh £809 £204 £1,013 £10,239 10.1 yrs £10,021
6 kW 6129 kWh 3677 kWh 2452 kWh £970 £245 £1,216 £11,867 9.8 yrs £12,445
7 kW 7150 kWh 4290 kWh 2860 kWh £1,132 £286 £1,418 £13,494 9.5 yrs £14,869
8 kW 8172 kWh 4903 kWh 3269 kWh £1,294 £327 £1,621 £15,122 9.3 yrs £17,294

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: £1,097, Upfront: £11,639, Break-even: 10.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2043 kWh 1430 kWh 613 kWh £377 £61 £439 £6,756 15.4 yrs £2,018
3 kW 3064 kWh 2145 kWh 919 kWh £566 £92 £658 £8,383 12.7 yrs £4,777
4 kW 4086 kWh 2860 kWh 1226 kWh £755 £123 £877 £10,011 11.4 yrs £7,536
5 kW 5107 kWh 3575 kWh 1532 kWh £943 £153 £1,097 £11,639 10.6 yrs £10,295
6 kW 6129 kWh 4290 kWh 1839 kWh £1,132 £184 £1,316 £13,267 10.1 yrs £13,054
7 kW 7150 kWh 5005 kWh 2145 kWh £1,321 £215 £1,535 £14,894 9.7 yrs £15,813
8 kW 8172 kWh 5720 kWh 2452 kWh £1,510 £245 £1,755 £16,522 9.4 yrs £18,572

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: £1,122, Upfront: £13,389, Break-even: 11.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2043 kWh 1491 kWh 552 kWh £394 £55 £449 £8,506 19.0 yrs £469
3 kW 3064 kWh 2237 kWh 827 kWh £590 £83 £673 £10,133 15.1 yrs £3,328
4 kW 4086 kWh 2983 kWh 1103 kWh £787 £110 £897 £11,761 13.1 yrs £6,188
5 kW 5107 kWh 3728 kWh 1379 kWh £984 £138 £1,122 £13,389 11.9 yrs £9,047
6 kW 6129 kWh 4474 kWh 1655 kWh £1,181 £165 £1,346 £15,017 11.2 yrs £11,907
7 kW 7150 kWh 5220 kWh 1931 kWh £1,377 £193 £1,571 £16,644 10.6 yrs £14,766
8 kW 8172 kWh 5965 kWh 2206 kWh £1,574 £221 £1,795 £18,272 10.2 yrs £17,626

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: £1,139, Upfront: £15,139, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2043 kWh 1532 kWh 511 kWh £404 £51 £455 £10,256 22.5 yrs £-1,147
3 kW 3064 kWh 2298 kWh 766 kWh £607 £77 £683 £11,883 17.4 yrs £1,779
4 kW 4086 kWh 3064 kWh 1021 kWh £809 £102 £911 £13,511 14.8 yrs £4,706
5 kW 5107 kWh 3831 kWh 1277 kWh £1,011 £128 £1,139 £15,139 13.3 yrs £7,632
6 kW 6129 kWh 4597 kWh 1532 kWh £1,213 £153 £1,366 £16,767 12.3 yrs £10,559
7 kW 7150 kWh 5363 kWh 1788 kWh £1,415 £179 £1,594 £18,394 11.5 yrs £13,485
8 kW 8172 kWh 6129 kWh 2043 kWh £1,617 £204 £1,822 £20,022 11.0 yrs £16,412

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: £1,155, Upfront: £17,589, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2043 kWh 1573 kWh 470 kWh £415 £47 £462 £12,706 27.5 yrs £-3,463
3 kW 3064 kWh 2360 kWh 705 kWh £623 £70 £693 £14,333 20.7 yrs £-470
4 kW 4086 kWh 3146 kWh 940 kWh £830 £94 £924 £15,961 17.3 yrs £2,524
5 kW 5107 kWh 3933 kWh 1175 kWh £1,038 £117 £1,155 £17,589 15.2 yrs £5,517
6 kW 6129 kWh 4719 kWh 1410 kWh £1,245 £141 £1,386 £19,217 13.9 yrs £8,511
7 kW 7150 kWh 5506 kWh 1645 kWh £1,453 £164 £1,617 £20,844 12.9 yrs £11,504
8 kW 8172 kWh 6292 kWh 1880 kWh £1,661 £188 £1,848 £22,472 12.2 yrs £14,497

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.

Compare solar quotes before you sign

Check what MCS certification means

Understand DNO, G98 and G99 export limits

New quote check

Want a quote sanity check for TR11?

Share the first part of your postcode and a few basics. We’ll help you check whether system size, battery, export and paperwork assumptions look sensible before you commit to installer conversations.

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.

Request a quote sanity check →

Insights for TR11

Figures below are tailored to TR11 — click through for full league tables.

Big-Roof Britain Rank #747 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #408 of 2996
9.6 years (UK avg 10.8 years)
~£845 /yr • £8,139 upfront
Standing-Charge Drag Rank #1422 of 2996
25.0% (UK avg 26.6%) drag on savings
£211 fixed • ~£845 /yr value
Aspect Penalty View ranking →
East −21.0% West −19.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in TR11

Monthly generation per kilowatt of solar panels

kWh 34 Jan 53 Feb 87 Mar 119 Apr 127 May 126 Jun 124 Jul 117 Aug 97 Sep 66 Oct 41 Nov 30 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 46.1% 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 39 kWh per month; the average month produces around 85 kWh. So a typical 4 kW home system would generate roughly 157 kWh in winter, or 340 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.39p/kWh
Daily Fixed Charge
57.89p/day
Local Sunshine
1021kWh/kW
A 1 kW system generates ~1021 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: 60% • Flats: 23% • Bungalows: 15% Based on 9,822 properties

Coverage

Cornwall (100%)

Areas Covered

Falmouth Trescobeas & Budock, Falmouth Arwenack, Falmouth Penwerris, Falmouth Boslowick, Constantine, Mabe & Mawnan, Mylor, Perranarworthal & Ponsanooth + 7 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

TR10 (Cornwall)
≈2.6 km away
Local sunshine: ~1,027 kWh/kWp · +1% vs TR11
TR3 (Cornwall)
≈7.4 km away
Local sunshine: ~1,038 kWh/kWp · +2% vs TR11
TR1 (Cornwall)
≈12.5 km away
Local sunshine: ~1,029 kWh/kWp · +1% vs TR11
TR16 (Cornwall)
≈13.5 km away
Local sunshine: ~1,013 kWh/kWp · -1% vs TR11
TR15 (Cornwall)
≈13.9 km away
Local sunshine: ~1,012 kWh/kWp · -1% vs TR11
TR12 (Cornwall)
≈14.3 km away
Local sunshine: ~1,097 kWh/kWp · +7% vs TR11

Similar sunshine across the UK

GU6 (Waverley)
~1,021 kWh/kWp · +0% vs TR11
IP23 (Mid Suffolk)
~1,021 kWh/kWp · -0% vs TR11
IP30 (Mid Suffolk)
~1,022 kWh/kWp · +0% vs TR11